The acceleration of pellets is considered in a channel of constant cross section, and analytic expressions are derived for the pellet velocity at the exit of the channel and for the minimum discharge of the accelerating gas; the results are used to optimize the design of a gasdynamic injector. The ...
Energy Citations Database
A prototype 100mA injector is presently being designed and manufactured jointly between Thomas Jefferson National Accelerator Facility (JLab) and Advanced Energy Systems (AES). This paper discusses the physics optimization and performance of the injector ...
National Technical Information Service (NTIS)
Injector gun design is an iterative process where the designer optimizes a few nonlinearly interdependent beam parameters to achieve the required beam quality for a particle accelerator. Few tools exist to automate the optimization process and thoroughly ...
Injector gun design is an iterative process where the designer optimizes a few nonlinearly interdependent beam parameters to achieve the required beam quality for a particle accelerator. Few tools exist to automate the optimization process and thoroughly explore the parameter space. The challenging beam ...
DOE Information Bridge
A prototype 100mA injector is presently being designed and manufactured jointly between Thomas Jefferson National Accelerator Facility (JLab) and Advanced Energy Systems (AES). This paper discusses the physics optimization and performance of the injector which has been studied using the space-charge tracking code ...
The PARMELA particle dynamics code has been used at SLAC to simulate the SLC injector from the electron gun through the first accelerator section. The strength of injector components was set and tuned based on the simulation results. Parametric studies with PARMELA were conducted in which injector components were ...
The positive ion injector project will replace a High Voltage Engineering Corp. model FN 9 MV tandem electrostatic accelerator as the injector into the ATLAS superconducting heavy ion linear accelerator. It consists of an electron cyclotron resonance (ECR) ion source on a 350-kV platform injecting into a linac of ...
NASA Astrophysics Data System (ADS)
The main challenge for the European XFEL photo injector is the production of 1 nC electron beams with a normalized transverse emittance of 0.9 mm mrad. The photo injector setup consists of a 1.5-cell L-band rf gun cavity supplied with solenoids for beam focusing and emittance compensation and the first accelerating section with 8 TESLA ...
A terawatt accumulator (TWAC) accelerator/storage ring complex with the laser ion source is in progress at ITEP. The new injector I4 based on the radio frequency quadrupole (RFQ) and interdigital H-mode (IH) linear accelerator is under construction. The front end of the new TWAC injector consists of a laser ion ...
PubMed
... and storage rings, misc.; Particle sources and injectors; Radio frequency guns and linac injectors; Particle sources; Linear accelerators; Pulsed and ...
DTIC Science & Technology
... Accession Number : AD0660737. Title : INJECTOR-TYPE ELECTRON ACCELERATOR WITH CONSTANT WAVE PHASE VELOCITY,. ...
The phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the ...
A magnet sorting procedure for accelerators is developed. It is implemented in two steps. The first step is completely analytical in character while the second step involves the comparison of computed values with the measured error values. The method has been implemented for sorting the Advanced Photon source (APS) injector synchrotron dipoles and ...
The FERMI {at} Elettra facility will make use of the existing GeV linac at Sincrotrone Elettra, which will become available for dedicated FEL applications following the completion of construction of a new injector booster complex for the storage ring. With a new rf photocathode injector, and some additional accelerating sections, this ...
The space charge effect plays an important role in accelerator injectors, in which the particle energy is relatively low. The emittance compensation technique makes it possible to effectively analyze and optimize such beamlines. This method is used for obtaining simple and reliable analytical and numerical estimates for the increase in ...
... ACCELERATOR COMPONENTS, *SUPERCONDUCTORS), (*ELECTRON BEAMS, INJECTORS), LINEAR ACCELERATORS, LEAD(METAL ...
We have conducted a multiobjective computational optimization of a high brightness, high average current photoinjector under development at Cornell University. This injector employs a dc photoemission electron gun. Using evolutionary algorithms combined with parallel computing resources, the multivariate parameter space of the photoinjector was explored ...
An injector optimization methodology, method i, is used to investigate optimal design points for a gaseous oxygen/gaseous hydrogen (GO2/GH2) swirl coaxial injector element. The element is optimized in terms of design variables such as fuel pressure drop, ...
Lawrence Livermore National Laboratory (LLNL) is evaluating design alternatives to improve the voltage regulation in our injector and accelerator cells of our Flash X-Ray (FXR) machine. The operational peak electron beam current and energy at the x-ray generating target are 3.2 kA and 17 MeV. The goal is to create a more mono-energetic electron beam with ...
There are many challenges in the design of the normal-conducting portion of the ILC positron injector system such as achieving adequate cooling with the high RF and particle loss heating, and sustaining high accelerator gradients during millisecond-long pulses in a strong magnetic field. The proposed design for the positron injector ...
A method is described for increasing the intensity of accelerated light-nucleus beams in linear proton accelerators. To attain such increase, the fore-injector of the LU-20 linear proton accelerator, which is the injector of the synchrophasotron of the Jo...
Several advanced plasma fueling systems are under development at the Oak Ridge National Laboratory (ORNL) for present and future magnetic confinement devices. These include multishot and repeating pneumatic pellet injectors, centrifuge accelerators, electrothermal guns, a Tritium Proof-of-Principle experiment, and an ultrahigh velocity mass ablation driven ...
The injector of the Flash X-Ray (FXR) accelerator has a significantly larger than expected beam emittance. A computer modeling effort involving three different injector design codes was undertaken to characterize the FXR injector and determine the cause o...
The recently completed Positive-Ion Injector for the heavy-ion accelerator ATLAS is a replacement for the tandem injector of the present tandem-linac system. Unlike the tandem, the new injector provides ions from the full range of the periodic table. The ...
A linear accelerator as a new injector for the SSC (Separated Sector Cyclotron) of the HIRFL (Heavy Ion Research Facility Lanzhou) is being designed. The DTL (Drift-Tube-Linac) has been designed to accelerate 238U34+ from 0.140 MeV/u to 0.97 MeV/u. To the first accelerating tank which ...
The injector for the Fusion Materials Irradiation Test (FMIT) Facility must deliver a 110-mA dc beam of deuterons or H/sub 2//sup +/ ions to the radio-frequency quadrupole (RFQ) accelerator at 75-keV energy. Operational parameters of a hydrogen-fed cusp-field ion source and a high-perveance extractor have been evaluated on a test stand and on the recently ...
Many injector designs for free-electron lasers and linear colliders use photocathode sources in lieu of a thermionic cathode. These designs require mode-locked lasers with very tight phase and amplitude jitter specifications to achieve the electron beam quality needed for these applications. We have characterized the long term stability of a mode-locked laser for use in the ...
The Positive Ion Injector (PII) is part of the Uranuim upgrade for ATLAS accelerator at Argonne National Laboratory. This paper will include a technical discussion of the Positive Ion Injector (PII) accelerator with its superconducting, niobium, very low-...
Fuel Injector Design Optimization for an Annular Scramjet Geometry ... Supersonic combustion ramjet engines; Experiment design; computational fluid dynamics ...
NASA Website
May 31, 2011 ... Fuel Injector Design Optimization for an Annular Scramjet Geometry AUTHOR(S): ... Supersonic combustion ramjet engines; Experiment design; ...
... Pagination or Media Count : 9. Descriptors : *ION SOURCES, USSR, TRANSLATIONS, PROTON ACCELERATORS, PATENTS, INJECTORS. ...
The low-energy demonstration accelerator (LEDA) 75-keV proton injector is being developed for tests of high-current (100-mA) cw linacs. The injector comprises a microwave proton source and a space-charge neutralized magnetic low-energy beam-transport system (LEBT). The LEDA injector has been configured to provide ...
A diagnostic beam system has been developed for the GDT. This injector is the modification of the diagnostic injector RFX-DNBI. The system is primarily used for magnetic field measurements via motional Stark effect (MSE). The ion source provides 50keV, 5A hydrogen beam. Ions are extracted from a plasma created by an arc-discharge source and, after ...
Automation of DC photoinjector designs using a genetic algorithm (GA) based optimization is an accepted practice in accelerator physics. Allowing the gun cavity field profile shape to be varied can extend the utility of this optimization methodology to superconducting and normal conducting radio frequency (SRF/RF) gun based ...
This report discusses: recurrence of KAM tori in nonanalytic twist maps; Arnold diffusion in three-degrees-of-freedom Hamiltonian systems; beam-beam interaction and pacman effects; systematic treatment of isolated nonlinear difference resonance; correction of nonlinear effects by magnet sorting; optimization of linac injector system; self consistent ...
The injector for the Fusion Materials Irradiation Test (FMIT) Facility must deliver a 110-mA dc beam of deuterons or H sub 2+ ions to the radio-frequency quadrupole (RFQ) accelerator at 75-keV energy. Operational parameters of a hydrogen-fed cusp-field io...
The development of the 4-Rod RFQ as an injector for low charged heavy ions has demonstrated that structures with spiral-shaped or straight stems can be made highly efficient, very stable, and compact. The design of the RFQ structures and results of optimizations with respect to impedance and field quality will be discussed.
structure of the beam in the buncher. Simple calculations (confirmed by simulation) give optimal bunching Injector of LEP) accelerating structure, RF power plant, beam line, control system and diagnostics. Specified and measured beam parameters will be compared to show the performances of the photo- fission
E-print Network
The design study is described for the drift tubes of the linear accelerator for the injector of a 1-Bev electron synchrotron. (auth)
The Next Linear Collider Test Accelerator (NLCTA) being built at SLAC will integrate the new technologies of X-band accelerator structures and RF systems for the Next Linear Collider, demonstrate multibunch beam-loading energy compensation and suppression of higher-order deflecting modes, measure transverse components of the ...
This paper describes the control system of the injector for the LINAC-800 linear electron accelerator. The architecture of the control system, the equipment, and software are presented. This system is part of the first segment of the control system of the LINAC-800 electron accelerator.
A virtual cathode collective acceleration configuration is examined for use as a pulsed, intense ion injector. Numerical calculations of the collective acceleration have shown peak ion energies of several times that of the electron beam energy. This is co...
At the MPI f�r Kernphysik, a new type of accelerator is under construction which consists of a CHORDIS ion source [1], two RFQ and eight 7-gap resonators [2]. The High Current Injector will deliver 1-3 orders of magnitude higher intensities in comparison to the existing tandem-postaccelerator combination. The RFQ is designed to ...
Reactor particle fueling is one of the issues that remain to be resolved in the development of a tokamak fusion reactor. One of the most promising concepts of reactor fueling is the injection of high-speed compact toroids (CTs). Compact toroid formation and acceleration at the Ring Accelerator Experiment (RACE) device at Lawrence Livermore National ...
... the high current induction linear accelerator of the nanosecond range, meant to be used as injector in the collective ion accelerator, are presented. ...
This paper will address areas where relativistic heavy ion accelerators differ from proton facilities. Salient areas are: (1) the specialized injectors for heavy ions; ion sources, structures for very low charge-to-mass ratio (q/A) ions, and stripper optimization; (2) special requirements for the synchrotron ring; ultrahigh vacuum, ...
The linac injector for the Advanced Light Source (ALS) at LBL was recently put into operation. Energy is 50 MeV, frequency 3 GHz. The electron gun delivers up to 6nC in a 3.0-ns bunch at 120 kV. A train of bunches is injected into a 1-Hz booster and accelerated to 1.5 GHz for storage ring injection. A magnetic analysis system is used for ...
Electron injectors delivering relativistic electron beams with very high brightness are essential for a number of current and proposed electron accelerator applications. These high brightness beams are generally produced from photoemission cathodes. We formulate a limit on the electron beam brightness from such cathodes set by the transverse thermal energy ...
A new magnet sorting method for accelerators is developed. It is based on the linearized analysis of the effects of errors on accelerators. It is implementable in two steps. The first step is completely analytical in character while the second step involves the comparison of computed values with the measured error values. The whole process is repeated at ...
Major improvements have been made on the Adam injector at the SuperHILAC heavy ion accelerator. Adam is a pressurized Cockcroft-Walton injector, typically run at voltages in excess of 2 MeV. The PIG ion source was redesigned to increase the length of the ...
An upgrade of the Beam Position Monitor (BPM) signal processing and data acquisition system for the Fermilab Main Injector is described. The Main Injector is a fast cycling synchrotron that accelerates protons or antiprotons from 8 to 150 GeV. Each Main I...
The Deuterium Pellet Injector (DPI), an eight-pellet pneumatic injector, is being designed and fabricated for the Tokamak Fusion Test Reactor (TFTR). It will accelerate eight pellets, 4 by 4 mm maximum, to greater than 1500 m/s. It utilizes a unique pelle...
A new positive ion injector (PII) is currently under construction at Argonne that will replace the existing 9-MV tandem electrostatic accelerator as an injector into ATLAS. It consists of an electron-cyclotron resonance-ion source on a 350-kV platform inj...
ATA is a pulsed, 50 ns 10 KA, 50 MeV linear induction electron accelerator at LLNL. The ETA could be used as an injector for ATA. However the possibility of building a new injector gun for ATA, raised the question as to what changes from the ETA gun in el...
configuration of an annular scramjet injector geometry using computational fluid ... Ignition and combustion of this fuel source results in the formation of a thermal ...
The APLE (Average Power Laser Experiment) photoinjector accelerates electrons to 5 MeV with four cavities. A solenoid placed between the first two cavities focuses the low energy (1.2 MeV) electron beam. The beam transport and the beam quality of the injector depend on the detailed field profile of the solenoid. To describe the solenoid magnetic field ...
The four barrel, two-stage pneumatic injector for the Ignitor experiment (IPI), built by ENEA and ORNL, has been tested in the course of three esperimental campaigns. The optimal shaping of the propellant pressure pulse to improve pellet acceleration is provided by specially designed Pulse Shaping Valves. These have been modified and ...
Design and development of a sixteen beam, heavy ion injector is in progress at Los Alamos National Laboratory (LANL) to demonstrate the injector technology for the High Temperature Experiment (HTE) proposed by Lawrence Livermore Laboratory (LBL). The injector design provides for individual ion sources mounted to a support plate ...
An upgrade program is being carried out at Los Alamos to increase the peak beam current from the present H{sup {minus}} injector to provide 200 {mu}A average current for the proton storage ring at LANSCE. In order to meet this objective, the injector must provide at least 30% more current than presently available. More optimal ...
We report the design, construction and the testbed results for a novel compact gas gun injector for solid diagnostic pellets of different sizes and materials. The injector was optimized for the diagnostic requirements of the ASDEX Upgrade tokamak, yieldin...
The performance of a free electron laser strongly depends on the electron beam quality or brightness. The electron beam is transported into the free electron laser after it has been accelerated to the desired energy. Typically the maximum beam brightness produced by an accelerator is constrained by the beam brightness deliverd by the ...
The arbitrary-order map beam optics code COSY Infinity has recently been adapted to calculate accurate high-order ion-optical maps for electrostatic and radio-frequency accelerating structures. The beam dynamics of the superconducting low-velocity positive-ion injector linac for the ATLAS accelerator at Argonne National Lab is used to ...
The Sandia National Laboratories program to produce a light weight, compact, high voltage, high-current recirculating linear accelerator (RLA) uses a low-energy electron beam (LEEB) produced ion focus regime (IFR) plasma channel to electrostatically guide an intense relativistic electron beam (REB). The near-term goal is to inject a 1. 5-MV, 10-20 kA, 25-ns FWHM beam onto this ...
Experimental results on the distribution of radiation fields along the booster injector - linear accelerator with HF-focusing are presented and analysis of secondary radiation parameter connection with accelerator regime is given. A dependence of neutron ...
This paper discusses the centrifuge injector for Tora Supa and the electron beam rocket acceleration of a solid deuterium-tritium fuel pellet in Tora Supa. 5 refs., 1 figs
The group considered physics, accelerator, and polarized source issues. Most of the physics study was concerned with what significant and unique experiments could be done if polarized protons could be accelerated in the main injector and eventually in the Tevatron. 12 refs., 4 figs.
The electronics in the injector of the NIKHEF-K electron accelerator works at a voltage level of 400K volts. In order to control the pulsshape and the reliability of the pulser the measuring signal has to be brought down to ground-level. Therefore a measu...
Previous studies of the Advanced Test Accelerator inrjector using the low density plasma cathode (flashboard cathode) have shown that the brightness of the injector was being limited by the non-uniform emission of the cathode surface. To avoid this diffic...
The initial experimental results of the Brookhaven accelerator test facility (ATF) in-line injector is presented. The ATF in-line injector employed a full copper RF gun with a pair of solenoid magnets for emittance compensation. The maximum acceleration f...
In order to improve the speed and reproducibility of restoring the beam in the Continuous Electron Beam Accelerator Facility (CEBAF) 45 MeV injector after a full or partial shutdown of the accelerator, a program has been written using the Tcl/Tk scripting...
The construction of an ion source testing device is described which can be used as injector for the Munich MP-tandem accelerators. Studies of the existence of double negative charged ions are described. Uranium ion beams were produced in a sputtering sour...
In the context of developing an efficient low-energy beam transport (LEBT) system for a low-emittance injector the problem of transport and matching of a 30 mA, 35 kV H- beam from a magnetron-type ion source is studied; the analysis is done incorporating important experimental constraints. A 30 cm-long LEBT, consisting of six electrostatic quadrupole lenses and a short einzel ...
Several Space Shuttle Main Engines (SSME) have experienced very high acceleration responses measured
NASA Technical Reports Server (NTRS)
The Positive Ion Injector (PII) is part of the Uranuim upgrade for ATLAS accelerator at Argonne National Laboratory. This paper will include a technical discussion of the Positive Ion Injector (PII) accelerator with its superconducting, niobium, very low-velocity accelerating structures. It ...
The RADLAC-II Module (RIIM) accelerator has been converted to a double-pulse accelerator with a foilless diode injector load. The diode/injector performance has been addressed in the double-pulse operation mode using two machine configurations to compare ...
Accelerator injector designs have been evaluated using two computer codes. The first code self consistently follows relativistic particles in two dimensions. Fields are obtained in the Darwin model which includes inductive effects. This code is used to study cathode emission and acceleration to full injector ...
A review of the design and specifications of the resistive accelerators in the SSC complex was conducted during the past year. This review was initiated in response to a request from the SSC Project Manager. The Error and Emittance Task Force was created October 30, 1992, and charged with reviewing issues associated with the specification of errors and tolerances throughout ...
Waterflooding is currently the most commonly used method to improve oil recovery after primary depletion. The reservoir heterogeneity such as permeability distribution could negatively affect the performance of waterflooding. The presence of high permeability streaks could lead to an early water breakthrough at the producers and thus reduce the sweep efficiency in the field. One approach to ...
Efforts are underway to automate the operation of a railgun hydrogen pellet injector for fusion reactor refueling. A plasma armature is employed to avoid the friction produced by a sliding metal armature and, in particular, to prevent high-Z impurities from entering the tokamak. High currents are used to achieve high accelerations, resulting in high plasma ...
In this paper the technique used to control the relative timing and synchronization of the major accelerator systems at Fermilab is described. The various operating modes of the injector accelerators include fixed target and colliding beam operation in co...
... the accelerator cell load. ... for the output stage to minimize losses and provide fast ... is capable of powering a 0.5 MeV injector induction cell assembly. ...
acceleration is performed by ion cyclotron resonant frequency (ICRF) acceleration. The Advanced Space. Propulsion Laboratory (ASPL) is actively developing ...
The recently completed positive-ion injector for the heavy-ion accelerator ATLAS is a replacement for the tandem injector of the present tandem-linac system. Unlike the tandem, the new injector provides ions from the full range of the periodic table. The concept for the new injector, which ...
The recently completed Positive-Ion Injector for the heavy-ion accelerator ATLAS is a replacement for the tandem injector of the present tandem-linac system. Unlike the tandem, the new injector provides ions from the full range of the periodic table. The concept for the new injector, which ...
A dual-source injector for tandem accelerators to produce negative ion currents of H, D, and He has been developed and built. The system consists of a central vacuum enclosure that accommodates two multicusp ion sources. Beam currents of several mA of H(-) and D(-) have been obtained by direct negative extraction of one of the multicusp ion sources. The ...
We report experiments evaluating the beam generation by the new 4-MV RLA injector and the subsequent beam transport and acceleration through the ET-2 post-accelerating cavity. Beams of 15 to 20 kA current were produced and successfully accelerated through...
Problems on application of the alternating-phase focusing (APF) accelerating system as a channel of preliminary ion acceleration with 1/2-1/4 specific charge on the ITEP I-2 linear proton injector-synchrotron are considered. Accelerating-focusing channels...
This paper contains progress information on the following topics: universal sealing of the power spectrum for period n-tupling; problems of universality in phase transitions in low-symmetry systems; beam-beam interaction and Pacman effects; systematic treatment of isolated nonlinear difference resonances; correction schemes of nonlinear effects; optimization of linac ...
To date, the 120 GeV Fermilab Main Injector accelerator has accelerated a single batch of protons from the 8 GeV rapid-cycling Booster synchrotron for production of antiprotons for Run II. In the future, the Main Injector must accelerate 6 or more Booster batches simultaneously; the first will ...
Some aspects of physics that contributed to design and operation of the ETA 10 kAmp electron accelerator are discussed. These include: the electron source, the emittance growth in the injector, beam transport through the accelerator, and the influence of the beam breakup accelerator instability.
Several methods for imaging using accelerated heavy ion beams are being investigated at Lawrence Berkeley Laboratory. Using the HILAC (Heavy-Ion Linear Accelerator) as an injector, the Bevalac can accelerate fully stripped atomic nuclei from carbon (Z = 6...
Laser- and particle beam-driven plasma wakefield accelerators produce accelerating fields thousands of times higher than radio-frequency accelerators, offering compactness and ultrafast bunches to extend the frontiers of high energy physics and to enable laboratory-scale radiation sources. Large-scale kinetic simulations provide ...
An important linear accelerator requirement, in order to demonstrate narrow energy spectra, is the injection of electron bunches of narrow phase spread and negligible inter-bunch current. This can be achieved by r-f transverse modulation and clipping of the beam by an aperture prior to injection into the accelerator waveguide, i.e., chopper operation. By ...
The Fermilab Main Injector is a new 150 GeV proton synchrotron, designed to replace the Main Ring and improve the high energy physics potential of Fermilab. The status of the Fermilab accelerator complex upgrade will be discussed. Study of the stability of the beam in the Main injector will be discussed. Detuning and corrector scheme ...
The Stanford Synchrotron Radiation Laboratory (SSRL) Injector is comprised of a linear accelerator (linac) capable of energies {le} 150 MeV, a 3 GeV booster synchrotron, and a beam line to transport the electrons into the storage ring SPEAR. The injector is shielded so that under normal operating conditions, the annual dose equivalent ...
A Positive-Ion Injector (PH) designed to enable ATLAS to accelerate all stable nuclei has been completed and successfully tested. This new injector system consists of an ECR source on a 350-kV platform coupled to a 12-MV superconducting injector linac for...
The photo-injector for the Neptune Advanced Accelerator Laboratory is introduced. Its component parts, including the radio frequency gun, photo-cathode drive laser system, booster linac, RF system, chicane compressor, beam diagnostics, and control system are described. The injector is designed to produce high brightness, short pulse ...
A new positive ion injector (PII) is currently under construction at Argonne that will replace the existing 9-MV tandem electrostatic accelerator as an injector into ATLAS. It consists of an electron-cyclotron resonance-ion source on a 350-kV platform injecting into a superconducting linac optimized for very slow ...
ENEA and ORNL have built a four barrel, two-stage pneumatic injector for the Ignitor experiment featuring two innovative concepts: (i) an optimal shaping of the propellant pressure pulse to improve pellet acceleration, and (ii) the use of fast closing (< 10 ms) valves to drastically reduce the expansion volumes of the propellant gas ...
Electron Cyclotron Resonance (ECR) ion sources are essential components of heavy-ion accelerators due to their ability to produce the wide range of ions required by these facilities. The ever-increasing intensity demands have led to remarkable performance improvements of ECR injector systems mainly due to advances in magnet technology as well as an ...
For the SPARC Project a novel diagnostic device, called "Emittance-meter", has been conceived and constructed to perform a detailed study of the emittance compensation process in the SPARC photo-injector and to optimize the RF-gun and the accelerator working point. It consists of a movable emittance measurement system, based on the ID ...
For the SPARC Project a novel diagnostic device, called "Emittance-meter", has been conceived and constructed to perform a detailed study of the emittance compensation process in the SPARC photo-injector and to optimize the RF-gun and the accelerator working point. It consists of a movable emittance measurement system, based on the 1D ...
The 20 MeV, 4 kA linear induction accelerator (FXR), currently under construction at LLNL, will use a cold cathode injector. The foil cathode consists of a 0.03 mm tantalum ribbon wound in a spiral with successive turns spaced 0.8 mm apart. The emitted current will be 15 to 20 kA but will be reduced to 4 kA by collimating immediately beyond the anode. This ...
For the High Current Beam Transport Experiment (HCX) at Lawrence Berkeley National Laboratory, an injector is required to deliver up to 1.8 MV of 0.6 A K+ beam with an emittance of [approximate]1 [pi]-mm-mrad. We have successfully operated a 10-cm-diameter surface ionization source together with an electrostatic quadrupole (ESQ) accelerator to meet these ...
For the High Current Beam Transport Experiment (HCX) at LBNL, an injector is required to deliver up to 1.8 MV of 0.6 A K{sup +} beam with an emittance of {approx}1 p-mm-mrad. We have successfully operated a 10-cm diameter surface ionization source together with an electrostatic quadrupole (ESQ) accelerator to meet these requirements. The pulse length is ...
For the High Current Beam Transport Experiment (HCX) at LBNL, an injector is required to deliver up to 1.8 MV of 0.6 A K+ beam with an emittance of (approx)1 p-mm-mrad. We have successfully operated a 10-cm diameter surface ionization source together with an electrostatic quadrupole (ESQ) accelerator to meet these requirements. The pulse length is ...
... fabricated with ports drilled along the longitudinal axis of the injector ... wholly limited to, the relative magnitude and direction of the local ...
... and other physical dimensions of the furnace such as ... KINETICS, WAFERS, INJECTORS, THERMOCOUPLES, FURNACES, GAS FLOW, TUBES ...
A compact Drift-Tube-Linac (DTL) using an Interdigital H-mode (IH) cavity was designed for an injector of medical accelerators. For beam focusing, the method of Alternating-Phase-Focusing (APF) was applied. The APF IH-DTL can accelerate heavy ions having a charge-to-mass ratio of q/m=13 up to 4.0MeV/u. Having ...
An injector optimization methodology, method i, is used to investigate optimal design points for gaseous oxygen/gaseous hydrogen (GO2/GH2) injector elements. A swirl coaxial element and an unlike impinging element (a fuel-oxidizer-fuel triplet) are used t...
The phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the beam dynamics in the microtron considering 2-D motion of the electrons in the ...
The purpose of this experiment is to improve the optics of an intense H{sup -} negative ion beam, to be used in future tokamaks. The emittance diagnostic has been installed in the experimental set-up INCA, to perform an optimization of a negative-ion injector preaccelerator. The first stage of this work consists to test the operation of the electric-sweep ...
The problem of dynamics optimization for charged particle beams in RFQ accelerators is discussed in this article. The problems of the optimization of particle capture into the acceleration mode are analyzed. Accelerators with low injection energies are considered.
Although moderate in size, the Booster construction project requires a comprehensive control system. There are three operational modes: as a high intensity proton injector for the AGS, as a heavy ion accelerator and injector supporting a wide range of ions and as a polarized proton storage injector. These ...
The paper describes a new power distribution system for Fermilab's Main Injector. The system provides 13.8 kV power to Main Injector accelerator (accelerator and conventional loads) and is capable of providing power to the rest of the laboratory (backfeed system). Design criteria, and features including ...
A new heavy ion injector linac is proposed for providing heavy ion beams to a fixed field alternating gradient (FFAG) accelerator in Kyushu University. A combination of the new intense laser source based injector and the FFAG will be able to accelerate high current ion beams with 100 Hz of a repetition rate. The ...
A driver-scale injector for the Heavy Ion Fusion Accelerator project has been built at LBL. This machine has exceeded the design goals of high voltage (> 2 MV), high current (> 0.8 A of K{sup +}) and low normalized emittance (< 1 {pi} mm-mr). The injector consists of a 750 keV diode pre-injector followed ...
Beam transport experiments on Sandia's Recirculating Linear Accelerator (RLA) using a 1.5-MV injector with and without an additional 1.0 MV of acceleration provided by the ET-2 accelerating cavity were concluded this year. Our experimental results show th...
The LUX concept [1] for a superconducting recirculating linac based ultrafast x-ray facility features a unique high-brightness electron beam injector. The design of the injector complex that meets the baseline requirements for LUX is presented. A dual-rf gun injector provides both high-brightness electron beams to drive the cascaded, ...
Magnetic switching offers an alternative to overcoming the rep-rate and life limitations of the spark gaps in the ETA/ATA induction accelerators. The principle has been applied for many years to radar modulators but at much lower power levels and longer pulse lengths. Comparatively recent developments in magnetic materials together with some optimal ...
The Annex to the 7-GeV Advanced Photon Source Conceptual Design Report updates the Conceptual Design Report of 1987 (CDR-87) to include the results of further optimization and changes of the design during the past year. The design changes can be summarized as affecting three areas: the accelerator system, conventional facilities, and experimental systems. ...
The Heavy Ion Fusion Accelerator Research Group at LBNL is completing the re-design of the LBNL 2-MV ESQ Injector that will deliver at least 500 mA of singly-charged potassium ion beam at 2 MV for the High Current Transport Experiment (HCX). The LBNL 2-MV ESQ Injector, built and operated since 1993, has produced a potassium beam with ...
A highly charged heavy ion injector using an all permanent magnet type electron cyclotron resonance ion source (ECRIS) has been constructed in the high voltage terminal of the vertical and folded type 20UR Pelletron tandem accelerator at Japan Atomic Energy Agency at Tokai. The new in-terminal injector made it possible to ...
LBL's interest in RFQ accelerators goes back to 1978. We have developed, constructed and operated a heavy ion machine that is the central part of an upgrade project in which our old proton injector linac is converted to a light ion injector system. We are now designing a second heavy ion RFQ linac which will be used at CERN ...
The purpose and need for DOE to undertake the actions described in this document are to improve the efficiency of the Alternating Gradient Synchrotron (AGS) complex. Benefits would include optimization of the AGS scientific program, increased high-energy and nuclear physics experimentation, improved health and safety conditions for workers and users, reduced impact on the ...
The Fermilab Main Injector is a new 150 GeV proton synchrotron, designed to replace the Main Ring and improve the high energy physics potential of Fermilab. The status of the Fermilab accelerator complex upgrade will be discussed.
Pellet injectors are needed to fuel long pulse tokamak plasmas and other magnetic confinement devices. For this purpose, an apparatus has been developed that forms 1.3-mm-diam pellets of frozen deuterium at a rate of 40 pellets per second and accelerates ...
The design goal for the Fermilab Main Injector (FMI) is to accelerate a minimum of 6{times}10{sup 10} protons per bunch through the transition. We present here the results from simulation studies of the transition crossing in the FMI using the particle tracking code ESME.
Recent developments in the design and construction of the SSC are presented. Topics include status of the 20 TeV Collider rings, including interaction regions, utility regions, and main arcs, plus some remarks on the injector accelerators. Remaining issues facing the design of the colliding beams synchrotron and its injectors are ...
Several advanced plasma fueling systems are under development at the Oak Ridge National Laboratory (ORNL) for present and future magnetic confinement devices. These include multishot and repeating pneumatic pellet injectors, centrifuge accelerators, elect...
As part of the upgrading project of the GANIL accelerator complex, we have modified the two injector cyclotrons in order to increase their energy, which implies a larger extraction radius and a change of the harmonic mode operation from 4 to 3. The main c...
A growing interest in medical uses for high energy heavy ion beams has led to two recent proposals to build dedicated medical heavy ion synchrotrons. Linear accelerators are generally preferred as injectors for synchrotrons, but in the case of heavy ions ...
An investigation was conducted to define possible deleterious effects on injector system 'o-ring' components resulting from additions of freeze-point depressants to diesel fuel. An accelerated test method was subsequently developed to determine the compat...
The construction of the ATLAS Positive-Ion Injector (PII) is complete and beam acceleration tests are underway. The PII consists of an ECR ion source, on a high-voltage platform, providing beam to a low-velocity-acceptance, independently-phased, supercond...
The ATLAS Positive Ion Injector (PII) is designed to replace the tandem injector for the ATLAS heavy-ion facility. When the PII project is complete, ATLAS will be able to accelerate all ions through uranium to energies above the Coulomb barrier. PII consi...
Descriptions are given of an experimental injector for betatrons and synchrotrons. The device offers practically parallel electron beams with angular divergence varying up to 15 to 20 deg . The beam emergence angle is controlled by the asymmetric electrode distribution. (tr-auth)
Beam tests of the ANL 12 MHz Radio-Frequency Quadruple (RFQ), designed for use as the initial element of an injector system for radioactive beams into the existing ATLAS accelerators, are in progress. Recent high-voltage tests of the RFQ without beam achi...
The beam quality of the ATA injector has been experimentally measured using a magnetic collimator. These measurements have been performed for a variety of magnetic field profiles, including field strengths where the collimator is shorter than a cyclotron ...
The APS injector synchrotron ring measures about 368 m in circumference. In order to obtain the precision of the magnetic field required for the positron acceleration from 450 Mev to 7.7 Gev with low beam loss, eighty correction magnets are distributed ar...
The ANL (Argonne National Laboratory) high-resolution injector has been installed to obtain higher mass resolution and higher preacceleration, and to utilize effectively the full mass range of ATLAS (Argonne Tandem Linac Accelerator System). Preliminary r...
AAA-2000-3752. HELICON PLASMA INJECTOR AND ION CYCLOTRON ACCELERATION. DEVELOPMENT IN THE VASIMR EXPERIMENT. Jared P. Squire", Franklin R. Chang Dia4 Verlin ...
A magnetron-driven microtron injector has been developed for a terahertz free electron laser (FEL). An internal injection system was chosen for the microtron to achieve a compact and inexpensive design. The system provides acceleration of electrons with low emittance and energy spread that is highly important for the FEL. However, the intrapulse ...
Heavy ion fusion requires injection, transport and acceleration of high current beams. Detailed simulation of such beams requires fully self-consistent space charge fields and three dimensions. WARP3D, developed for this purpose, is a particle-in-cell plasma simulation code optimized to work within the framework of an accelerator`s ...
Optimization Online. Optimization for Simulation: LAD Accelerator. Miguel Lejeune (mlejeune ***at*** gwu.edu) Francois Margot (fmargot ***at*** ...
A program of nuclear physics experiments has been approved at SLAC, and a new high average current injector is being added to the accelerator 650 meters upstream (Sector 25) of the accelerator output. The new injector (NPI) will produce beams in End Station A of up to 150 mA, 1.6 ..mu..sec, 180 pps at energies from ...
PIGMI (Pion Generator for Medical Irradiations) is a compact linear proton accelerator design, optimized for pion production and cancer treatment use in a hospital environment. Technology developed during a four-year PIGMI Prototype experimental program allows the design of smaller, less expensive, and more reliable proton linacs. A new type of low-energy ...
We have simulated the SLC injector from the thermionic gun through the first accelerating section and used the resulting parameters to tune the injector for optimum performance and high charge transport. Simulations are conducted using PARMELA, a three-dimensional ray-trace code with a two-dimensional space-charge model. The magnetic ...
The recently completed positive-ion injector for the heavy-ion accelerator ATLAS was designed as a replacement for the tandem injector of the present tandem-linac system and, unlike the tandem, the positive-ion injector is required to provide ions from the full range of the periodic table. The concept for the new ...
The primary goal of this program was to improve the performance of induction accelerators with particular regards to their being used to drive Free Electron Lasers (FEL's). It is hoped that FEL's operating at visible wavelengths might someday be used to beam power from earth to extraterrestrial locations. One application of this technology might be strategic theater defense, ...
This is a review on the use of Tandem electrostatic accelerators for injection and filling of synchrotrons to accelerate intense beams of heavy-ions to relativistic energies. The paper emphasizes the need of operating the Tandems in pulsed mode for this application. It has been experimentally demonstrated that at the present this type of ...
The experimental data on constructing the high current induction linear accelerator of the nanosecond range, meant to be used as injector in the collective ion accelerator, are presented. The problems are considered which are connected with the formation ...
Gold ions for the 2007 run of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) are accelerated in the Tandem, Booster and AGS prior to injection into RHIC. The setup and performance of this chain of accelerators is review...
Copper ions for the 2005 run [1] of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) are accelerated in the Tandem, Booster and AGS prior to injection into RHIC. The setup and performance of these accelerators with copper are reviewed in this paper.
complex, consisting of a negative hydrogen-ion injector, a 1 GeV linear accelerator, a proton accumulator ring, and a liquid mercury target system. The SNS accelerator is the only...
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The Next Linear Collider Test Accelerator (NLCTA) being built at SLAC will integrate the new technologies of X-band accelerator structures and RF systems for the Next Linear Collider, demonstrate multibunch beam-loading energy compensation and suppression...
A beam chopper and buncher system has been designed to improve the capture efficiency and reduce the beam spill in the Electron Test Accelerator. The buncher increases the dc beam capture from 30 to 70%. 100% beam transmission through the accelerator stru...
The Brookhaven National Laboratory Accelerator Test Facility comprises a 50 MeV traveling wave electron linear accelerator utilizing a high gradient, photo-excited, raidofrequency electron gun as an injector and an experimental area for study of new accel...
The low energy beam transport system (LEBT) for the National Spallation Neutron Source is required to transport 35 mA of a 65 keV H- ion beam from the ion source to the radio frequency quadrupole accelerator (RFQ) entrance with a normalized root-mean-square emittance < 0.15 pi mm mrad. At a later time, it is anticipated that this beam current will be increased to 70 mA. For ...
High-resolution radiography using high-current electron accelerators based on the linear induction accelerator principle requires the linac's final spot on the X-ray target to be millimeter-sized. The requisite final focusing solenoid is adjusted for a specific beam energy at its entrance, hence, temporal variation of entrance beam energy results ...
The RADLAC-II Module (RIIM) accelerator has been converted to a double-pulse accelerator with a foilless diode injector load. The diode/injector performance has been addressed in the double-pulse operation mode using two machine configurations to compare two voltage regimes. In both cases, a gas phenomenon appears ...
of photo-injector was optimized at much lower RF gun phase than earlier studies, which agrees longitudinal profile control techniques, such a laser pulse truncation by saturable absorber, or electron beam on the photo-cathode RF gun injection system. ATF photo-injector has been in operation for almost a decade, its
Two injector accelerator options for HE-LHC of p{sup +} - p{sup +} collisions at 33 TeV cms energy are briefly outlined. One option is based on the Super-SPS (S-SPS) accelerator in the SPS tunnel, and the other one is based on the LER (Low-Energy-Ring) accelerator in the LHC tunnel. Expectations of performance of ...
The planned positive-ion injector for ATLAS consists of an ECR ion source on a 350-kV platfrom and a superconducting injector linac of a new kind. The objective is to replace the present tandem injector with a system that can increase beam intensities by two orders of magnitude and extend the mass range up to uranium. In the first, ...
A Positive-Ion Injector (PII) designed to enable ATLAS to accelerate all stable nuclei has been completed and successfully tested. This new injector system consists of an ECR source on a 350-kV platform coupled to a 12-MV superconducting injector linac formed with four different types of independently-phased 4-gap ...
