... Title : Structural Design and Analysis of Initial ... ACCELERATION, MORTARS, STRUCTURAL ENGINEERING, INTERIOR BALLISTICS, BORES ...

Accelerating sections for linear electron accelerators are considered which employ standing waves and are fabricated from multiperiodic structures. Analytic expressions are derived for calculating the cell parameters for doubly and triply periodic accelerating structures, and a method is ...

The IFMIF 125 mA cw 40 MeV accelerators will set an intensity record. Minimization of particle loss along the accelerator is a top-level requirement and requires sophisticated design intimately relating the accelerated beam and the accelerator structure. ...

With this paper, we propose the conceptual design of a traveling wave accelerating structure for a superconducting accelerator. The overall goal is to study a traveling wave (TW) superconducting (SC) accelerating structure for ILC that allows an increased ...

For the new, high-power accelerators currently being designed, the amount of activation of the accelerator structure has become an important issue. To quantify this activation, a methodology was utilized that coupled transport and depletion codes to obtai...

The SLAC Damped Detuned Structure (DDS) is an accelerator structure designed to suppress the long range transverse wakefields which limit the performance of high current multibunch accelerators. We discuss the conceptual considerations which have led to its development and discuss the steps ...

The design launch load cases included acceleration loads, dynamic pressures, ... acceleration loads, dynamic pressure loads, and cabin pressure loads for ...

The disk-and-washer (DAW) accelerator structure is being developed for several applications. Because of its complicated geometry and newness, vacuum calculations for the DAW accelerator structure are not yet formalized. The applicable vacuum equations for...

The higher the velocity of the ions a particular structure is designed to accelerate, the larger the number of that structure will be installed in an accelerator. Therefore, as the velocity increases it becomes more and more important to optimize the desi...

Funnels are a key component of accelerator structures proposed for transmutation technologies. In addition to conventional accelerator elements, specialized rf-cavities are needed for these structures. Simulations were done to obtain their electromagnetic...

The collaboration between the Los Alamos National Laboratory and the National Bureau of Standards (NBS), started in 1979, has led to the development of an advanced c-w microtron accelerator design. The four 2380-MHz NBS accelerating structures, containing...

An electromagnetic accelerator is designed for accelerating an ionized gas plasma to extremely high velocities at high flow rates. In the accelerator, a moving, preferably accelerating, magnetic field accelerates a ring-shaped plasma mass from one end of a ...

Material properties are vital for the field of accelerator R&D. Euclid Techlabs in collaboration with the Argonne Wakefield Accelerator facility team has investigated accelerator applications of metamaterials, photonic band gap structures, nonlinear, paramagnetic and ferroelectric materials. In this paper we ...

Jun 16, 2010 ... Location: Home Contains JPLArchives Contains Documents Contains Mass Acceleration Curve for Spacecraft Structural Design Properties ...

AIM-C is a methodology for accelerated insertion of materials into defense structures at reduced costs. This methodology develops a design knowledge database that links what is known about a material system to what is needed in order to quality its applic...

The disk-and-washer (DAW) accelerator structure is being developed for several applications. Because of its complicated geometry and newness, vacuum calculations for the DAW accelerator structure are not yet formalized. The applicable vacuum equations for this structure are presented and ...

The muffin-tin cavity structure is planar and well suited for mm-wave accelerator with silicon etching techniques. A constant impedance traveling-wave structure is considered for design simplicity. The RF parameters are calculated and the shunt impedance ...

The stationary wave structure necessary to accelerate low-energy ions has restricted the development of linear accelerators for this purpose, but at high energies this disadvantage is no longer present. A simplified discussion of the problems involved in building such machines leads to the conclusion that constant field ...

The elements of microwave linear accelerators are introduced starting with the principles of acceleration and accelerating structures. Considerations for microwave structure modeling and design are developed from an elementary point of view. Basic elements of microwave ...

The accelerating gradient is one of the crucial parameters affecting the design, construction and cost of next-generation linear accelerators. For a specified final energy, the gradient sets the accelerator length, and for a given accelerating structure and pulse repetition ...

The problems in the design and construction of an acceleration system for a proton synchrotron are reviewed. The Saturne acceleration system is based on a step process, and it is divided into a low- and a highlevel acceleration sthge. The frequency of the low-level stage is obtained with a master ...

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 ...

A prototype of a muffin-tin accelerating structure operating at 32 times the SLAC frequency (2.856 GHz) was built for research in high gradient acceleration. A traveling-wave design with single input and output feeds was chosen for the prototype which was fabricated by wire electrodischarge machining. Features of ...

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...

To provide for designed operating regimes of the EGP-15 accelerator it is necessary that the charging system provided for short circuit current of no lower than 300 (mu)A not appear to be the source of the accelerator high-voltage structure contamination ...

This report discusses the follow topics on radio frequency quadrupole accelerators: RFQ characteristics; low velocity accelerators; alternating-gradient focusing; acceleration; RFQ accelerator; bunching; adiabatic capture; injectors; transverse input matching; rf structures; mechanical ...

The pulsed positron beam at the Helsinki University of Technology is designed for the end energy of 3 30 keV and grounded target. This is achieved with a constant voltage acceleration followed by an adjustable deceleration. In the design of this accelerator decelerator the possibility for electrical breakdowns and ...

The accelerating gradient in a laser-driven dielectric accelerating structure is often limited by the laser damage threshold of the structure. For a given laser-driven dielectric accelerator design, we can maximize the accelerating gradient by choosing ...

... Descriptors : *ELECTRON ACCELERATORS, *LINEAR ACCELERATORS, *MICROWAVES, *TRAVELING WAVE ELECTRON ACCELERATORS ...

A superconducting resonant cavity containing a 10-cm active length, interdigital accelerating structure has been demonstrated to work at accelerating gradients above 5 MV/m. The 48.5-MHz, four-gap accelerating structure is designed for particle velocities 0.007c< or ...

Among the major limitations on manned aerospace vehicular-and-escape-system designs are the structural limits of the human body. One of the lower limits is the strength of the vertebral body under +Gz (eyeballs down) impact acceleration. When the vertebra...

The research activities for accelerator structures at SLAC are reviewed including the achievement via the main linac design for the Next Linear Collider (NLC), the program adjustment after the decision of the International Linear Collider (ILC) to be base...

The advanced accelerating cavities for the NLCTA (and anticipated for NLC) will incorporate damping as well as detuning. The damping is provided by a set of four waveguides (which also serve as pumping manifolds) that run parallel to the structure, with s...

In order to investigate the reappearance of the HOM wakefield of a detuned accelerator structure and relax tolerance requirements, we propose to provide low level damping by coupling all cavities to several identical and symmetrically located waveguides (manifolds) which run parallel to each accelerator structure ...

The basic scaling relations for important linear collider design parameters are introduced. Some of the basic concepts concerning the design of accelerating structures are presented, and breakdown limitations are discussed. Rf power sources are considered...

This paper describes a major computational effort that addresses key design issues in the high gradient accelerating structures for the proposed X-band linear collider, GLC/NLC. Supported by the US DOE's Accelerator Simulation Project, SLAC is developing a suite of parallel electromagnetic codes based on ...

Accelerating gradient is one of the crucial parameters affecting design, construction and cost of next-generation linear accelerators. Operating accelerating gradient in normal conducting accelerating structures is limited by rf breakdown. In this paper we describe an ...

The effect of beam loading upon the design and performance of the accelerator is examined. Results are given in dimensionless form so that the various equations and grams can be used at any operating frequency. The constant gradient accelerator is somewhat less subject to beam loading than the uniform ...

Modern and future accelerators for high energy and nuclear physics rely increasingly on superconducting components to achieve the required magnetic fields and accelerating fields.This paper presents a practical overview of the phenomenon of superconductivity, and describes the design issues and solutions associated with superconducting ...

Multi-mode accelerating structures aimed at increasing accelerating gradient are described. Such structures operating in several resonant, equidistantly-spaced, axisymmetric, TM-like eigenmodes allow reduction of exposure time to surface fields, reduction of high-field areas and reduction of those fields which are ...

The low energy part of Proton Engineering Frontier Project (PEFP) accelerators consists of a 3MeV RFQ and a 20MeV DTL. The following accelerator is a 60MeV DTL. This work is related with the beam dynamics design of the new accelerating structure. After optimizing the DTL cell geometry in order ...

The low energy part of Proton Engineering Frontier Project (PEFP) accelerators consists of a 3MeV RFQ and a 20MeV DTL. The following accelerator is a 60MeV DTL. This work is related with the beam dynamics design of the new accelerating structure. After optimizing the DTL cell geometry in order ...

Two rf coaxial couplers that are particularly suitable for intertank connection of the disk-and-washer accelerating structure for use in high-intensity linear accelerators have been developed. These devices have very high coupling to the accelerating structure and very low rf power loss at the ...

A coaxial two-channel dielectric wakefield structure is examined for use as a high gradient accelerator. A THz design, having radius {approx}1 mm, is shown to provide GeV/m--level acceleration gradient, high transformer ratio, and stable accelerated bunch motion when excited by a stable-moving ...

Coincidence of structural resonances with wind turbine dynamic forces can lead to large amplitude stresses and subsequent accelerated fatigue. For this reason, the wind turbine rotor blades and support structure are designed to avoid resonance coincidence...

The objective of this Phase II SBIR research program was to complete the final design originated during Phase I for a prototype Microwave Inverse Cerenkov Accelerator (MICA), to fabricate the-prototype MICA, and to test its performance as an electron accelerator. This report contains details of the design, ...

Validating design procedures for structures in salt masses can be accelerated by suitable laboratory or benchscale experiments where in situ loading conditions with inhomogeneous stress fields and heating are simulated, controlled, and repeated. Design va...

One of the options for future particle accelerators are photonic band gap (PBG) fiber accelerators. PBG fibers are specially designed optical fibers that use lasers to excite an electric field that is used to accelerate electrons. To improve PBG accelerators, the basic parameters of the fiber ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration. We focus on three-dimensional planar structures based on the so-called 'woodpile' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the photonic ...

The authors discuss simulated photonic crystal structure designs for laser-driven particle acceleration. They focus on three-dimensional planar structures based on the so-called ''woodpile'' lattice, demonstrating guiding of a speed-of-light accelerating mode ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration. We focus on three-dimensional planar structures based on the so-called ``woodpile'' lattice, demonstrating guiding of a speed-of-light accelerating mode by a defect in the photonic crystal lattice. ...

The NLC design achieves high luminosity with multiple bunches in each RF pulse. Acceleration of a train of bunches without emittance growth requires control of long range dipole wakefields. SLAC is pursuing a structure design which suppresses the effect of wakefields by varying the physical dimensions of successive ...

Vibrations induced in accelerator structures can cause particle-beam jitter and alignment difficulties. Sources of these vibrations may include pump oscillations, cooling-water turbulence, and vibrations transmitted through the floor to the accelerator structure. Drift tubes (DT) in a drift tube linac (DTL) are ...

This paper presents a progress report on the development and testing of X-band dielectric-loaded accelerating structures. Recent tests on several quartz DLA structures with different inner diameters are reported. Designs for gap-free DLA structures are presented. Also, planned new experiments ...

This paper presents a progress report on the development and testing of X-band dielectric-loaded accelerating structures. Recent tests on several quartz DLA structures with different inner diameters are reported. Designs for gap-free DLA structures are presented. Also, planned new experiments ...

We describe the operating principles, design, fabrication, assembly, and bench-test of a miniature planar dielectric traveling-wave accelerator structure made from dielectric brazed to oxygen-free electronic grade (OFE) copper. This work focuses on alumina ceramic (AL995) and diamond as dielectrics. This two-port device is matched to ...

High-energy accelerator structures should have not only a high shunt impedance, Z, by which the rf power can be used eficiently for particle acceleration, but also a high coupling, k, between the neighboring cells. A study was made of the disk and washer (DAW) accelerating structure. The DAW ...

The research activities for accelerator structures at SLAC are reviewed including the achievement via the main linac design for the Next Linear Collider (NLC), the program adjustment after the decision of the International Linear Collider (ILC) to be based on superconducting technology, and the work progress for the ILC, photon science ...

Research is underway at SLAC to develop accelerator structures for the next generation linear collider. An important feature of the design is a detuning of the dipole modes of the cells to suppress the long-range transverse wakefield by two orders of magnitude. This paper describes a facility, called ASSET, that will be incorporated ...

Diamond is an excellent material for dielectric loaded accelerating structures. It has a high breakdown threshold, very low dielectric losses and an extremely high coefficient of thermal conductance. In this paper we review progress on the design and development of diamond-based accelerating ...

Funnels are a key component of accelerator structures proposed for transmutation technologies. In addition to conventional accelerator elements, specialized rf-cavities are needed for these structures. Simulations were done to obtain their electromagnetic field distribution and to minimize the rf-induced heat ...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We describe guiding of a speed-of-light accelerating mode by a def...

The charge for the working group on high gradient and laser-structure based acceleration was to assess the current challenges involved in developing an advanced accelerator based on electromagnetic structures, and survey state-of-the-art methods to address those challenges. The topics of more than 50 presentations ...

The charge for the working group on high gradient and laser-structure based acceleration was to assess the current challenges involved in developing an advanced accelerator based on electromagnetic structures, and survey state-of-the-art methods to address those challenges. The topics of more than 50 presentations ...

Photonic crystals provide a method of confining a synchronous speed-of-light mode in an all-dielectric structure, likely a necessary feature in any optical accelerator. We explore computationally a class of photonic crystal structures with translational symmetry in a direction transverse to the electron beam. We demonstrate synchronous ...

As the frontier of particle physics moves towards higher energies, there is a mounting pressure on the accelerator physics community to develop new accelerating concepts resulting in more compact accelerators. This requires higher accelerating gradients and, owing to the trapping criterion, higher radiation ...

The Fusion Materials Irradiation Test (FMIT) Facility accelerator is being designed to continuously accelerate 100-mA deuterons to 25 MeV. High vacuum pumping of the accelerator structure and beam lines will be done by ion pumps and titanium sublimation pumps. The design of ...

Vertebral compression represents a significant percentage of the morbidity associated with upward ejection. Vertebral and intervertebral structure reacts to and is sometimes irreversibly altered by ejection acceleration. Design and material properties of ...

The characteristics and design parameters of low-velocity superconducting resonators for the acceleration of heavy ions are reviewed and discussed. Recent results obtained on lead-plated split-ring and half-wave resonators are also presented.

A quarter wavelength resonant parallel plate transmission line to be used to supply energy for acceleration heavy ions is described. The operating frequency of this low beta structure will be 2 megahertz. This resonator will be chiefly in air and provide ...

The Moyer method is applied to the design of transverse shielding for an electron linear accelerator, assuming uniform beam power loss along the accelerator structure. Parameters for this application are given and sample calculations are shown. For a beam...

In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this repository, illustrate its usage, and discuss our future plans, with empha...

In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this repository, illustrate its usage, and discuss our future plans, with emphasis on code benchmarking.

This document contains briefing charts on the Accelerated Insertion of Materials - Composites (AIM-C). Topics covered include a summary of progress to date: accurately predicted laminate stiffness, accurately predicted typical unnotched and open hole stre...

physics; linear-accelerator-structure engineering, design; high-space-charge proton-accumulator/compressor-ring physics; beam-transport-lattice physics, engineering;...

In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this repository, illustrate its usage, and discuss our future plans, with emphasis on code benchmarking.

Three-dimensional woodpile photonic bandgap (PBG) waveguide enables high-gradient and efficient laser driven acceleration, while various accelerator components, including laser couplers, power transmission lines, woodpile accelerating and focusing waveguides, and energy recycling resonators, can be potentially integrated on a single ...

A method and means for controlling the temperature of a particle accelerator and more particularly to the maintenance of a constant and uniform temperature throughout a particle accelerator is offered. The novel feature of the invention resides in the provision of two individual heating applications to the accelerator ...

... INDUCTION SYSTEMS, *ELECTRON ACCELERATORS, *PARTICLE ACCELERATORS, IMPEDANCE, BETATRONS, NUCLEAR STRUCTURE. ...

The design of high-intensity accelerators is described, using examples of machines being built at the Los Alamos National Laboratory. The major design problem with these accelerators is associated with control of beam loss when accelerator intensity is increased. Beam dynamics, beam loss, and ...

We examine the re-acceleration of a bunched beam through a linear induction accelerator (LIA) cavity, with attention to the energy lost through coupling to the TM modes of the structure. We find that the energy lost at 1 kA peak current is a small fraction of the boost which the LIA is designed to impart. We ...

Cost considerations in the design of high energy (TeV) accelerators have lead to the development of linear supercollider technology which is based upon higher rf (GHz) systems which can increase the accelerating gradient and reduce the size of the accelerating structure. Scaling of GHz rf ...

The paper presents the design of an X-band accelerating section for linearizing the longitudinal phase space in the Frascati Linac Coherent Light Source (SPARC). The nine cells structure, operating on the ? standing wave mode, is fed by a central coupler and has been designed to obtain a 42 MV/m ...

The paper presents the design of an X-band accelerating section for linearizing the longitudinal phase space in the Frascati Linac Coherent Light Source (SPARC). The nine cells structure, operating on the ? standing wave mode, is fed by a central coupler and has been designed to obtain a 42 MV/m ...

Shuttle, SPARTAN-201 designed to collect data about acceleration ..... system arm the SPARTAN-204 from its support structure in pay- load bay. ...

... above, improved fuel control acceleration schedule adjustments were designed to increase ... The structural reliability of the case will be improved by ...

The electronics involved in the design of the LIU is reviewed. The structure of the 14 series-connected modules is discussed as is the performance of the critical spark gaps. (AIP)

The effects of the October 1979 Imperial Valley, California earthquake on buildings was discussed. The implications of the observed effects and measured ground accelerations on structural design was examined. (ACR)

A strong demand for high gradient structures arises from the limited real estate available for linear accelerators. RadiaBeam Technologies is developing a Doubled Energy Compact Accelerator (DECA) structure: an S-band standing wave electron linac designed to operate at ...

A strong demand for high gradient structures arises from the limited real estate available for linear accelerators. RadiaBeam Technologies is developing a Doubled Energy Compact Accelerator (DECA) structure: an S-band standing wave electron linac designed to operate at ...

In two-beam accelerators, the reacceleration of a modulated drive beam can enable high conversion efficiency of electron beam energy to rf energy. However, the stability issues involved with the transport of high current electron beams through rf extraction structures and induction accelerator cells are critical. The author reports on ...

In many future collider and FEL designs intense, short bunches are accelerated in a linear accelerator. For example, in parts of the Linac Coherent Light Source (LCLS) a bunch with a peak current of 3.4 kA and an rms length of 30 microns will be accelerated in the SLAC linac. In such machines, in order to predict ...

Field stability and tuning are critically important for the design of any accelerator. The standing wave structure is under consideration for implementation in the Next Linear Collider. A 15-cavity standing wave accelerator structure was modeled with equivalent circuits in which nearest ...

This paper presents new results of high-gradient studies performed on a 1.8 m traveling-wave accelerator section with detuned high-order deflecting modes. This structure was designed initially for studies of detuned structures and will be installed in the Next Linear Collider Test Accelerator ...

The input power of accelerator structure is normally fed through a coupling slot(s) on the outer wall of the accelerator structure via magnetic coupling. While providing perfect matching, the coupling slots may produce non-axial-symmetric fields in the coupler cell that can induce emittance growth as the beam is ...

In this paper, we study the RF feeding system for a set of standing-wave accelerator structures. To avoid the initial reflections produced by the structures, sometimes these structures are fed in pairs through a four-port 3-dB Hybrid. We present an extension to this system for an arbitrary number of ...

The Working Group 3 papers were divided into two general categories, those related to laser-based schemes and those based on microwave technology. In the laser-based area highlights include ongoing theoretical and experimental efforts to demonstrate electron acceleration in vacuum based either on ponderomotive or nonponderomotive mechanisms. Papers on advanced issues such as ...

... Descriptors : *ELECTRON ACCELERATORS, *SOLIDS, DESIGN, LINEAR ACCELERATORS, MEASUREMENT, PHYSICAL PROPERTIES. ...

During the past several years, there has been tremendous progress the development of the RF system and accelerating structures for a Next Linear Collider (NLC). Developments include high-power klystrons, RF pulse compression systems and damped/detuned accelerator structures to reduce wakefields. In order to ...

An RFQ accelerator using the new four-rod cavity design has been fabricated and successfully tested at Texas Accelerator Center. The RFQ is designed to accelerate a 10 mA H^- ion beam from 30 keV to 500 keV with the operating frequency of 473 MHz. This new type of RFQ ...

The novel design of a 1 MeV3He+ radiofrequency quadrupole (RFQ) accelerator is discussed. This RFQ is the first segment of an accelerator for the production of radioisotopes for positron emission tomography (PET) applications. This RFQ is unusual in that two specific innovations were incorporated into the design. ...

The design, construction, and bench testing of an X-band travelling-wave accelerating structure loaded with a permittivity=20 dielectric has been published recently by the Argonne Advanced Accelerator Group (1). Here we describe a new program to build a t...

We discuss simulated photonic crystal structure designs for laser-driven particle acceleration, focusing on three-dimensional planar structures based on the so-called ''woodpile'' lattice. We demonstrate guiding of a speed-of-light accelerating mode by a ...

A 100-mA 50-MeV H exp - accelerator is being designed at Los Alamos. The accelerating structures will operate at 425-MHz and will consist of a radio-frequency quadrupole (RFQ) to 2-MeV and a drift-tube linac (DTL) from 2 to 50-MeV. Design parameters have ...

The design of the prototype 120-keV, 65-A, 0.5-sec ion accelerator for TFTR-type beam systems is described. Details of the manufacture of the constituent parts are given along with descriptions of the major components of the accelerator. Included are the molybdenum grid structures, molybdenum shields, stainless ...

Included in the reports are sections containing information on structural, architectural, mechanical, and electrical phases of design. Other sections are included on construction phases. Appendixes contain drawings, bid forms, specifications, design progress schedule, and construction photographs. (J.R.D.)

The design, construction, and installation of pulsed septum magnets for particle accelerators presents many challenges for the magnet engineer. Issues associated with magnet core structure design, component alignment, weldment design, and electrical insul...

Vertical vibration of linac components (accelerating structures, girders and quadrupoles) in the NLC has been studied experimentally and analytically. Effects such as structural resonances and vibration caused by cooling water both in accelerating structures and quadrupoles have been ...

Vertical vibration of linac components (accelerating structures, girders and quadrupoles) in the NLC has been studied experimentally and analytically. Effects such as structural resonances and vibration caused by cooling water both in accelerating structure and quadrupoles have been considered. ...

One idea for controlling multibunch beam breakup in future linear colliders is to use accelerating structures that have a large ({approximately}10%) staggered tuning, that is, a large cell-to-cell spread in frequencies of the transverse dipole modes. Simulations of such structures using the programs TBCI and LINACBBU are compared, and ...

Vertical vibration of linac components (accelerating structures, girders and quadrupoles) in the NLC has been studied experimentally and analytically. Effects such as structural resonances and vibration caused by cooling water both in accelerating structures and quadrupoles have been ...

Vertical vibration of linac components (accelerating structures, girders and quadrupoles) in the NLC has been studied experimentally and analytically. Effects such as structural resonances and vibration caused by cooling water both in accelerating structures and quadrupoles have been ...

The muffin-tin cavity structure is planar and well suited for mm-wave accelerator with silicon etching techniques. A constant impedance traveling-wave structure is considered for design simplicity. The RF parameters are calculated and the shunt impedance is compared with the shunt impedance of a disk loaded ...

Increasing the power handling capabilities of rf components is an important issue for the design of rf accelerators and rf sources. RF breakdown is a phenomena that limit the high power performance. A major concern is the damage that can occur in rf components from breakdown. To better understand this damage, we have studied rf breakdown in a rectangular ...

A disk-loaded waveguide (DLW) is the most common structure for compact linear accelerators working in a traveling wave (TW) regime. Among its advantages are high shunt impedance and manufacturing simplicity. The other popular structure is an on-axis coupled bi-periodical accelerating structure ...

We present the design and simulation of a three-dimensional photonic crystal waveguide for linear laser-driven acceleration in vacuum. The structure confines a synchronous speed-of-light accelerating mode in both transverse dimensions. We report the properties of this mode, including sustainable gradient and ...

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 ...

The primary goal of this paper is to represent a design study of the ground accelerator of a single-stage-to-orbit vehicle and the landing gear of VTO and HTO vehicles. The main contents include the design requirements, system composition, functions, and performance of the ground accelerator as well as the ...

Two types of linear induction accelerator have been reported previously. In one, unidirectional voltage pulses are generated outside the accelerator and injected into the accelerator cavity modules, which contain ferromagnetic material to reduce energy losses in the form of currents induced, in parallel with the beam, in the cavity ...

During the past several years, there has been tremendous progress on the development of the RF system and accelerating structures for a Next Linear Collider (NLC). Developments include high-power klystrons, RF pulse-compression systems and damped/detuned accelerator structures to reduce wakefields. In order to ...

Induction accelerating gap designs are being studied for Relativistic Klystron Two-Beam Accelerator (RK-TBA) applications. The accelerating gap has to satisfy the following major requirements: hold-off of the applied accelerating voltage pulse, low transverse impedance to limit beam breakup, ...

Voltage breakdown is one of the major limiting factors in the design of a high accelerating gradient linear accelerator structure. A multiple-use cavity test system was developed to establish the criteria for voltage breakdown in S-band pulsed electron linear accelerator cavities, in terms of ...

A variety of accelerator designs are being considered for the Accelerator Production of Tritium (APT) project at Alamos National Laboratory. Because activation of the structural components of the accelerator is considered a major radiation protection issue, we have developed a computational ...

The theoretical research works on proton and ion acceleration done by our group are reviewed. A complex target consisting of a front horizontal slice adjoining a conventional heavy ion and proton double-layer slab are used to produce more-fast moving hot electrons to enhance the target-normal sheath acceleration (TNSA) so that the protons in the proton ...

At the low energy end of an induction linac HIF driver the beam current is limited by our ability to control space charge by a focusing system. As a consequence, HIF induction accelerator designs feature simultaneous acceleration of many beams in parallel within a single accelerator structure. ...

The basic premises of the conceptual design for the linac upgrade are pursued to establish lengths, gradients, power dissipation, etc., for the 400 MeV linac and matching section. The discussion is limited to accelerating and focusing components. Wherever values depend on the choice of the accelerating structure, ...

Radiofrequency quadrupoles (RFQs) are low-energy rf accelerator structures which can efficiently transport and accelerate high-current ion beams. For a wide range of applications, RFQs can be designed that, like all rf accelerators, have a fixed output energy per amu, that can be varied by ...

For the design of the linear optics of the superconducting linear accelerator for a Full Scale Energy Amplifier (C. Rubbia and J.A. Rubio, "A Tentative Program Towards a Full Scale Energy Amplifier", CERN/LHC/96-11 (EET), Geneva 15th July 1996.) , a computer code was developed for the 3- dimensional linear motion with space charge effects and transverse ...

... Accession Number : AD0637068. Title : THEORY AND DESIGN OF LINEAR ACCELERATORS: COLLECTION OF ARTICLES. ...

We present a first study of the pulse line ion accelerator operating in a multipulse, multisection mode. The study is directed towards applications with long beam pulse in a long linac with a series of accelerating structures. We show that this operating mode is possible provided that the amplitude of the ...

A new high beam power microwave electron linear accelerator, LINTEC 1020, has been built and installed for the AEA, EBIS (Harwell) Limited medical sterilisation irradiation facility. LINTEC microwave electron beam accelerator designs are based upon travelling wave RF structures working at 1300 MHz, with beam powers ...

There is an ongoing effort to develop accelerating modules for high-current electron accelerators for advanced radiography application. Accelerating modules with low beam-cavity coupling impedances along with gap designs with acceptable field stresses comprise a set of fundamental design ...

A measuring system at the table-top scale was developed for RF measurements of a muffin-tin accelerating structure operating at 32 times the SLAC frequency (2.856 GHz). Both perturbation and non-perturbation methods are employed to characterize the RF properties of a muffin-tin structure. Conventional bead pull measurements are ...

Different couplers are described that allow the reduction of both transverse wake potential and RF kick in the SC acceleration structure of ILC. A simple rotation of the couplers reducing the RF kick and transverse wake kick is discussed for both the main linac and bunch compressors, along with possible limitations of this method. ...

Transverse wakefield suppression in the CLIC (Compact Linear Collider) multibunch accelerating structure, called the TDS (Tapered Damped Structure), is achieved primarily through heavy damping. In order to verify the performance of the TDS design and the validity of the theoretical tools used to model it, a 15 GHz ...

An electromagnetic accelerator in the form of a linear electric motor (LEM) has been designed to achieve controlled acceleration profiles of a carriage containing hydrodynamically unstable fluids for the investigation of the development of turbulent mix. Key features of the design include: (1) independent control ...

In the design of future linear colliders, it will be important to minimize the loss of beam energy due to the excitation of higher-order modes in the accelerator structure by single bunches of electrons or positrons. This loss is not only detrimental in i...

Recent experience with X-band accelerator structure development has shown the rf input coupler to be the region most prone to rf breakdown and degradation, effectively limiting the operating gradient. A major factor in this appears to be high magnetic fie...

The purpose of this calculation is to provide structural integrity analysis for the loaded new spent fuel rack arrays against possible seismic excitation. The seismic design calculation is based on the UCRL-15910 spectrum with peak ground acceleration of ...

Following successful design and fabrication of damped detuned structures, the R and D for the accelerating structures of the NLC/JLC linear collider project proceeded to studies of Rounded Damped Detuned Structure with curved cross section of the cavity shape for increased shunt impedance. The ...

The basic scaling relations for important linear collider design parameters are introduced. Some of the basic concepts concerning the design of accelerating structures are presented, and breakdown limitations are discussed. Rf power sources are considered. Some of the key concepts of wakefield ...

We report on recent progress in a program to develop an RF-driven Dielectric-Loaded Accelerating (DLA) structure, capable of supporting high gradient acceleration. Previous high power tests revealed that the earlier DLA structures suffered from multipactor and arcing at the dielectric joint. A few new DLA ...

Recent progress and new developments in Electromagnetic Structure-Based Acceleration were presented in this Working Group (WG). The presentations made to the WG were separated into two categories: slow-wave and fast-wave accelerating structures. The slow-wave talks included a theoretical study of ...

The FELIX free-electron laser uses short pulses of relativistic electrons produced by an RF accelerator. The design target for the duration of these electron bunches was around 3 ps. In experiments we observed that the bunches emit coherently enhanced spontaneous emission (CSE) when they travel through an undulator. It was demonstrated that the power level ...

We describe a new concept for a microwave circuit functioning as a charged-particle accelerator at mm wavelengths, permitting an accelerating gradient higher than conventional passive circuits can withstand consistent with cyclic fatigue. The device provides acceleration for multiple bunches in parallel channels, and permits a short ...

In the year 2000, a design concept of a Neutrino Factory based on Muon Storage Ring was studied at FNAL. To treat high energy spread of muons that come out of a target and decay channel and are to be accelerated before they go into the storage ring, a phase rotating scheme using a long-pulse accelerating system has been proposed. In ...

The collaboration between the Los Alamos National Laboratory and the National Bureau of Standards (NBS), started in 1979, has led to the development of an advanced c-w microtron accelerator design. The four 2380-MHz NBS accelerating structures, containing a total of 184 accelerating cavities, ...

The design of low-velocity superconducting structures has been an active area of the superconducting rf (srf) technology for more than 3 decades. More recently, with the growing interest in medium-energy ion and proton accelerators, a sustained world-wide...

The design and fabrication techniques for a large, rectangular magnetic bucket plasma source are described. This source is compatible with the accelerator structures for the TFTR and DIII neutral-beam systems.

The design and fabrication techniques for a large, rectangular magnetic bucket plasma source are described. This source is compatible with the accelerator structures for the TFTR and DIII neutral-beam systems. (ERA citation 05:017238)

The radio-frequency quadrupole (RFQ) linear accelerator structure is expected to permit considerable flexibility in achieving linac design objectives at low velocities. Calculational studies show that the RFQ can accept a high-current, low-velocity, dc be...

Energen, Inc. has designed, built, and demonstrated several fast and slow tuners based on its magnetostrictive actuators and stepper motor. These tuners are designed for Superconducting Radio Frequency (SRF) cavities, which are important structures in par...

Seismic isolation has been shown to be able to reduce transmitted seismic force and lower response accelerations of a structure. When applied to nuclear reactors, it will minimize seismic influence on the reactor design and provide a design which is less ...