Vacuum system requirements for proton accelerators and colliders with superconducting megnets are discussed. The vacuum systems for the colliding beam accelerator and the Tevatron are described. (WHK)

... Corporate Author : FERMI NATIONAL ACCELERATOR LAB BATAVIA IL*. ... Abstract : The Physics Section vacuum deposition system is available for ...

A design study for a vacuum system aperture for the Advanced Test Accelerator is described. A combination suction/axial aerowindow concept is recommended. (GHT)

The application of high-vacuum systems and techniques to nuclear research is discussed. information is presented on: the application of the vacuum chamber to particle accelerators, pumps for accelerators, the uses of vacuum systems in separation ...

Vacuum system requirements for proton accelerators and colliders with superconducting megnets are discussed. The vacuum systems for the colliding beam accelerator and the Tevatron are described. (ERA citation 08:041999)

Parameters of outgassing and vacuum maintenance are analyzed. It was thought that cryogenic pumping and getter-ion pumping would be necessary to achieve desired pressures in the accelerating tube. Use of a manifold to eliminate poor vacuum chamber conductance is also recommended for consideration. (J.R.D.)

Excellent vacuum is essential for long photocathode lifetimes in DC high voltage photoelectron guns. Vacuum Research at Thomas Jefferson National Accelerator Facility has focused on characterizing the existing vacuum systems at the CEBAF polarized photoin...

This paper presents the results of a calculation of 197Au32+ ion beam losses as they interact with atoms and molecules of residual gas in the acceleration chamber of the booster vacuum system of the NICA accelerator complex [1].

The calculation technique of the vacuum parameters of the synchrotron constant-charge heavy ion accelerators is developed. Non-elastic interaction cross sections of the residual gas medium atoms with the accelerated ions are given. Simple and practically ...

A proposed cryogenic pumping system of the vacuum chamber of the Dubna synchrophasotron is considered. The system provides the lowest pressure in the Vacuum chamber of the synchrophasotron, Psub(cham)=2x10 exp -7 Torr which permits one to accelerate nucle...

... accelerators. A survey of the testing facilities, including vacuum systems, resistance heaters, and liquid metal heaters is given. The experimental ...

... positions near the tank walls shows ... ARC JET ENGINES, ENVIRONMENTAL TESTS ... PROPULSION SYSTEMS, TANKS(CONTAINERS), VACUUM ...

Outgassing and conductance performances of HVEC type accelerating tube sections are calculated, measured and discussed. Based on the proposed Vivitron terminal stripping arrangement and tube pumping system, the vacuum pressure distribution along the accel...

accelerators and colliders, vacuum thermal insulation, ultra-high vacuum (UHV), extreme high vacuum (XHV) systems for semiconductor processing, X-ray tubes, ...

Particle accelerators and particle physics detectors require large electrical insulators with metal embedments having vacuum on one side and an insulating fluid or gas on the other. For high vacuum requirements they may be fabricated out of sintered alumi...

... Descriptors : *LINEAR ACCELERATORS, *PROTON ACCELERATORS, *COLLIDER ACCELERATORS, SYMPOSIA, VACUUM CHAMBERS ...

A review is given of the history of electrostatic accelerator technology, including a technology assessment of acceleration tubes, vacuum systems, voltage gradients, charging systems, and ion sources. Improvements in the performance of electrostatic accel...

Many accelerator vacuum system components require electrical insulation internal to the vacuum system. Some accelerator components at Brookhaven National Laboratory are installed in ultra-high-vacuum systems which require the ...

A system which allows to separate vacuum systems of the magnetic-optic beam channels connected with the accelerator has been worked out for case of emergency environment break through the extraction ''window''. The system, consisting of two valve - gate d...

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 the roughing system ...

At Lawrence Livermore National Laboratory, we are developing a new type of accelerator, known as a Dielectric Wall Accelerator, in which compact pulse forming lines directly apply an accelerating field to the beam through an insulating vacuum boundary. The electrical strength of this insulator may define the ...

Structure of multiturn septum magnet for the systems of proton beam extraction from the IHEP accelerator is described. Excitation coil, magnet core and all communications are located outside the accelerator vacuum volume. The magnet is characterized by a ...

The accelerator test stand (ATS), in operation at the Los Alamos National Laboratory, includes a hydrogen ion source, low- and high-energy beam-transport sections, and a 425-MHz radio-frequency quadrupole (RFQ) linear accelerator. A 425-MHz drift-tube linac (DTL) and a powered ''buncher'' matching section have been ...

This report presents a review of vacuum system operating experiences from particle accelerator, fusion experiment, space simulation chamber, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative...

To fulfill the need for intense 14-MeV neutron sources for controlled thermonuclear reactor material damage studies, several accelerators will be built at the Lawrence Livermore Laboratory. A high-capacity vacuum system will be required to handle the larg...

The AGS Booster is a synchrotron for the acceleration of both protons and heavy ions. The design pressure of low 10{sup {minus}11} mbar is required to minimize beam loss of the partially stripped heavy ions. To remove contaminants and to reduce outgassing, the vacuum chambers and the components located in them will be chemically cleaned, ...

A chirped pulse inverse free-electron laser (IFEL) vacuum accelerator for high gradient laser acceleration in vacuum. By the use of an ultrashort (femtosecond), ultrahigh intensity chirped laser pulse both the IFEL interaction bandwidth and accelerating gradient are increased, thus yielding ...

This report discusses the basic ICA experiment, the gas cell design; the radial polarization converter system; the psec carbon dioxide laser system; the model predictions for ATF ICA experiment; the analysis of near-resonance ICA; and the laser acceleration in a vacuum. (LSP)

Two vacuum systems were designed and built for the RFQ (Radio Frequency Quadrupole) cavity in the APT/LEDA (Low Energy Demonstration Accelerator) linac. The gas load from the proton beam required very high hydrogen pump speed and capacity. The gas load from the high power RF windows also required very high hydrogen pump speed for the ...

Chemical cleaning, vacuum firing, glow discharge cleaning and insitu bakeout have become standard practice for lowering the outgassing rate and removing surface contaminants in the ultra high vacuum systems of particle accelerators and storage rings. This...

Design of the force block and adgezator vacuum chamber of the KUTI-20 heavy ion collective accelerator are presented. The force block sustains mechanical loadings and ensures the necessary tolerances for the magnetic system coil placement. The vacuum cham...

The creation and destruction of entanglement between a pair of interacting two-level detectors accelerating about diametrically opposite points of a circular path is investigated. It is found that any nonzero acceleration has the effect of suppressing the vacuum entanglement and enhancing the acceleration ...

The creation and destruction of entanglement between a pair of interacting two-level detectors accelerating about diametrically opposite points of a circular path is investigated. It is found that any nonzero acceleration has the effect of suppressing the vacuum entanglement and enhancing the acceleration ...

The AGS Booster is a synchrotron for the acceleration of both protons and heavy ions. A pressure of low 10{sup {minus}11} Torr is required for the acceleration of the partially stripped, low {Beta}, very heavy ions. This paper describes the power supplies and controls for this ultra-high vacuum system with the ...

The Fermi National Accelerator Laboratory (Fermilab) is building an Accumulator Ring to store antiprotons for high energy physics proton-antiproton collisions in the Tevatron accelerator. The Accumulator Ring approximately 474 m in circumference, consists...

The effects of stored energy in the system capacitance across the accelerator grids during high voltage vacuum breakdown are examined. Measurements were made of the current flow and the energy deposition on the grids during breakdown. It is shown that onl...

Leaks and cracks have developed in the vacuum windows of the linac WR 284 waveguide directional couplers. In the existing coupler design the vacuum window is brazed to the waveguide. Replacement of a cracked window requires the removal of the component from the waveguide system resulting in a loss of vacuum in the ...

The LAMPF II accelerator will require sufficient vacuum to prevent beam loss or beam blowup within the time the beam is in the accelerator. Because this time is quite short (tau < 0.03 s), the vacuum requirements should be somewhat less strict than for the long-time storage machines, such as the ISR (tau greater ...

A review is given of the history of electrostatic accelerator technology, including a technology assessment of acceleration tubes, vacuum systems, voltage gradients, charging systems, and ion sources. Improvements in the performance of electrostatic accelerators during the ...

Several new vacuum components have been developed for the XFEL/SPring-8 project. Vacuum waveguide flanges were successfully developed. These flanges provide both RF seal and vacuum seal. The vacuum seal mechanism of these flanges can make seal completely even with a deep scratch on the gasket. Solid-lubricated ...

The 6 MV Folded Tandem Ion Accelerator (FOTIA) Facility at the Nuclear Physics Division, BARC is operational and accelerated beams of both light and heavy ions are being used extensively for basic and applied research. An average vacuum of the order of 10-8-10-9 Torr is maintained for maximum beam transmission and minimum beam energy ...

The AGS Booster currently under construction at Brookhaven is a synchrotron for the acceleration of both protons and heavy ions. The design pressure of 3 /times/ 10/sup /minus/11/ Torr is required to minimize beam loss of the partially stripped heavy ions. This paper described the design and processing of the ultra high vacuum system, ...

The electrical strength of vacuum insulators is a key constraint in the design of particle accelerators and pulsed power systems. Vacuum insulating structures assembled from alternating layers of metal and dielectric can result in improved performance compared to conventional insulators, but previous attempts to ...

To fulfill the need for intense 14-MeV neutron sources for controlled thermonuclear reactor material damage studies, several accelerators will be built at the Lawrence Livermore Laboratory. A high-capacity vacuum system will be required to handle the large deuterium gas load needed to produce the beam current. Outgassing of ...

At Lawrence Livermore National Laboratory, we are developing a new type of accelerator, known as a dielectric wall accelerator, in which compact pulse-forming lines directly apply an accelerating field to the beam through an insulating vacuum boundary. The electrical strength of this insulator may define the ...

The requirements for the construction of the vacuum chamber of an accelerator are described. The problems which must be solved include air tightness, behavior of materials under irradiation, valves, packing materials, vacuum production. vacuum pumps, return of pumped media into the receiver, and control ...

The vacuum system for Heavy Ion Fusion machines can be divided according to pressure into 4 parts: (a) Ion Sources; (b) Linear Accelerators; (c) Circular Accelerators, Accumulators and Storage Rings; and (d) Reactors. Since ion sources will need rather conventional pumping arrangements and reactors will operate ...

The Alternating Gradient Synchrotron (AGS) is a synchrotron for the acceleration of protons and heavy ions to tens of GeV/amu for fixed target physics research. The Relativistic Heavy Ion Collider (RHIC), with the AGS as its injector, allows the collision of heavy ion beams with energies of several hundred GeV/amu. The vacuum systems ...

The Continuous Electron Beam Accelerator Facility (CEBAF), a continuous wave (CW) 4 GeV Electron Accelerator is undergoing construction in Newport News, Virginia. When completed in 1994, the accelerator will be the largest installation of radio-frequency superconductivity. Production of cryomodules, the fundamental building block of ...

Two versions of vacuum arc sources for producing accelerated ion beams and plasma flows are described. The sources are distinguished by use of a dc vacuum arc discharge for plasma generation on the basis of a simple linear or coaxial plasma gun with extended large area (70 300 and 1500 cm2) cathodes and microparticle filtering ...

Software tools available with the Ground Test Accelerator (GTA) control system provide the capability to express a control problem as a finite state machine. System states and transitions are expressed in terms of accelerator parameters and actions are taken based on state transitions. This is particularly useful ...

... ACCELERATORS, *ION ACCELERATORS, RINGS, VACUUM APPARATUS, ELECTRONS, MAGNETIC FIELDS, CROSSED FIELD DEVICES ...

... The electrical strength of vacuum insulation and spurious loads in accelerators; Problems of high-frequency feed; Construction of linear accelerators ...

The Dependex sealing concept is a reliable O-ring vacuum seal using Viton or, in special applications, soft metal seals of indium. Dependex fittings are used extensively on accelerator beam lines where high vacuum is acceptable and high-temperature bakeouts are not routine. A method of adapting stainless-steel Dependex fittings for use ...

The NSLS X-ray ring exhibits a direct correlation between photon beam motion, and distortion of the ring vacuum chamber induced by fluctuations in the cooling system. We have made long term measurements of photon beam vertical position, accelerator vacuum...

The coupling includes a flanged joint sealed by a gasket and seat arrangement. The combination may be used in systems for transmitting wave power from klystron tubes to accelerator vacuum systems or to radar systems. The coupling seal utilizes a combinati...

Gold targets were prepared under various conditions using both a cryopump and a conventional diffusion pump evaporator system. Measurements were made at the Argonne Tandem Accelerator system to determine the purity of these targets.

Gold targets were prepared under various conditions using both a cryopump and a conventional diffusion pump evaporator system. Measurements were made at the Argonne Tandem Accelerator system to determine the purity of these targets. (ERA citation 09:05046...

Vertical drains combined with vacuum pressure and surcharge preloading are widely used to accelerate the consolidation process of soft clay in order to decrease the pore pressure as well as to increase the effective stress. Currently there are two types of vacuum preloading systems commercially available; (a) ...

A new recirculating turbo molecular pump-based gas stripper system has been designed and installed in the high-voltage terminal of the 15 UD pelletron. The system has been installed as a part of the Accelerator Mass Spectrometry facility development program and is being used for regular accelerator operation. The ...

This report presents a review of vacuum system operating experiences from particle accelerator, fusion experiment, space simulation chamber, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of vacuum ...

Septum magnet with 0.5 mm-thick current sheet, developed for the system of slow and fast proton beam extraction from the IHEP accelerator, is described. Septum magnet may be used in accelerators with high and ultrahigh vacuum. Thermal loss removal from th...

The AGS Booster is designed to be an intermediate synchrotron injector for the AGS, capable of accelerating protons from 200 MeV to 1.5 GeV. The parameters listed include beam and operational parameters and lattice parameters, as well as parameters pertaining to the accelerator's magnets, vacuum system, ...

The development of a high-energy (10Mev) neutron imaging system at Lawrence Livermore National Laboratory (LLNL) depends on a precision engineered rotating aperture and vacuum system for generating neutrons that are used for imaging dense objects. This subsystem is part of a larger system which includes a linear ...

A steam ejector-condenser unit was built and tested to produce a 10 Torr (13.3 x 10/sup 2/Pa) vacuum with a 2 cm aperture to the atmosphere. This unit is the first stage of a differential vacuum pumping station that will be used with the Experimental Test Accelerator. The accelerator's electron beam will ...

CERN operated over the more than 50 years of its existence particle accelerators and storage rings ranging from a few tens of metre to 27 km, the size of its latest project, the Large Hadron Collider (LHC) which is under construction and will be started in 2008. The challenges began with the Intersection Storage Rings (ISR) in the seventies. With a beam pipe length of 2 � 1 ...

with extreme care by applying e.g. integral leak tests. In addition a careful and systematic pre vacuum systems for accelerators. Following some introductory remarks the pump down, leak check, bake out. INTRODUCTION Once the manufacturing and testing of all individual components of a complex system

A summary is presented of the findings from the ESCAR prototype superconducting synchrotron accelerator development project. The report includes description of the Lattice and beam parameters; superconducting magnets, cryostats; refrigeration and cryogenic distribution; vacuum systems; electrical systems; and ...

A compilation is presented of the experimental facilities of the world's cyclotrons including history and status, staff and operation, research staff, target facilities, magnet, acceleration system, vacuum system, characteristic beams, beam properties, and a plan view of the facility for each cyclotron. ...

A 6-Bev alternating gradient electron synchrotron, similar to the Cambridge Electron Synchrotron, is being constructed at Hamburg. The basic design features of the accelerator and its buildings are summarized. The maximum energy and orbit radius, AG magnet structure, magnet power cycle, radiation by electrons, radiofrequency acceleration, ...

The cascade tyne particle accelerator of 800-kv rated voltage built at the Institute of Nuclear Rssearch is described. For producing high voltage a selenoid rectifier was applied, whereas for the beaded supports of the accelerator Ganz-pabit'' was chosen. The inhomogenous accelerating tube of 4 steps is ...

Two vacuum systems were designed and built for the RFQ (Radio Frequency Quadrupole) cavity in the APT/LEDA (Low Energy Demonstration Accelerator) linac. The gas load from the proton beam required very high hydrogen pump speed and capacity. The gas load from the high power RF windows also required very high hydrogen pump speed for the ...

Two vacuum systems were designed and built for the RFQ (Radio Frequency Quadrupole) cavity in the APT/LEDA (Low Energy Demonstration Accelerator) linac. The gas load from the proton beam required very high hydrogen pump speed and capacity, The gas load from the high power RF windows also required very high hydrogen pump speed for the ...

Excellent vacuum is essential for long photocathode lifetimes in DC high voltage photoelectron guns. Vacuum Research at Thomas Jefferson National Accelerator Facility has focused on characterizing the existing vacuum systems at the CEBAF polarized photoinjector and on quantifying improvements ...

Excellent vacuum is essential for long photocathode lifetimes in DC high voltage photoelectron guns. Vacuum research at Thomas Jefferson National Accelerator Facility has focused on characterizing the existing vacuum systems at the CEBAF polarized photoinjector and on quantifying improvements ...

The Intersecting Storage Accelerator (ISABELLE) consists of two rings having a circumference of 3.8 km each. In these rings superconducting magnets, held at 4 K, bend and focus the proton beam which is accelerated up to 400 GeV. Due to very different pressure requirements, ISABELLE has two completely independent vacuum ...

Investigations on the laser acceleration in vacuum are reviewed including up-date experimental results, projects of new experiments and theoretical prospects of vacuum acceleration schemes for high energies of accelerated particles. Most attention is devoted to analysis of the IFELs with ...

The authors have designed, built and operated two vacuum systems for the RFQ (Radio Frequency Quadrupole) in the APT/LEDA (Accelerator Production of Tritium/Low Energy Demonstration Accelerator)linac: a cryopump system for the RFQ cavity and a non-evaporable getter (NEG) pump ...

S>The development of accelerator structures, klystrons, electronic equipmert, microwave equipment, vacuum systems, magnets, and beam equipment is summarized, together with development and operation of the Mark IV accelerator and experimental physics research. (D.C.W.)

The vacuum system of the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory has more than a thousand metal vacuum seals. Also, numerous elastomer seals are used throughout the AGS to seal large beam component chambers. An accelerator upgrade program is being implemented to reduce the AGS ...

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...

BNL is undertaking the design, construction and commissioning of the Spallation Neutron Source (SNS) accumulator ring and the beam transport lines [l]. Ultrahigh vacuum of 10{sup {minus}9} Torr is required in the accumulator ring to minimize beam-gas ionization, a contributing factor to the e-p instability observed in a few high-intensity proton storage rings. All ...

The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's experimental program. The Storage Ring's 1104 m circumference is divided into 40 functional sectors. The sectors include vacuum, ...

A study was performed to determine the source of impurities found in accelerator targets prepared by vacuum vapor deposition. (GHT)

A multielectrode device housed in an insulator vacuum vessel, the metal vapor vacuum switch has high