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in subjects: "Particle Beams 430100* -- Particle Accelerators-- Design, Development, & Operation"

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Experimental program to validate analyses of accelerator breeder concepts

The concept of using high-energy particle accelerators to produce neutrons for converting fertile material to fissile is over 25 years old. It is only relatively recently that accelerator design has progressed to a point where the operation approaches commercial viability. Critical unknowns in the concept were identified in a detailed study of specic configurations. Experiments to elucidate these unknowns in a timely manner using existing material and facilities are defined and identified. Basi… more

Date: January 1, 1977

Creator: Talbert Jr., W. L.; Russell, G. J. & Malenfant, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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LAMPF II - also a hyperon factory

The possibility of generating large numbers of hyperons via an intense 4.5 GeV/c K/sup -/ beam at LAMPF II is explored. The advantage of using a K/sup -/ beam over that of using a ..pi.. beam is examined. Hyperon fluxes and backgrounds are estimated and compared with those available from existing hyperon beams. Production mechanisms are briefly discussed.

Date: June 1, 1982

Creator: Sanford, T.W.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Advanced concepts for acceleration

Selected examples of advanced accelerator concepts are reviewed. Such plasma accelerators as plasma beat wave accelerator, plasma wake field accelerator, and plasma grating accelerator are discussed particularly as examples of concepts for accelerating relativistic electrons or positrons. Also covered are the pulsed electron-beam, pulsed laser accelerator, inverse Cherenkov accelerator, inverse free-electron laser, switched radial-line accelerators, and two-beam accelerator. Advanced concepts f… more

Date: July 1, 1986

Creator: Keefe, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Future e/sup +/e/sup -/ linear colliders and beam-beam effects

Numerous concepts, ranging from conventional to highly exotic, hae been proposed for the acceleration of electrons and positrons to very high energies. For any such concept to be viable, it must be possible to produce from it a set of consistent parameters for one of these ''benchmark'' machines. Attention is directed to the choice of parameters for a collider in the 300 GeV energy range, operating at a gradient on the order of 200 MV/m, using X-band power sources to drive a conventional disk-l… more

Date: May 1, 1986

Creator: Wilson, Perry B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Conceptual design of a 300-GeV accelerator based on the inverse free-electron laser mechanism

We describe an Inverse Free Electron Laser Accelerator and how it can be used to accelerate electrons to energies of several hundred GeV, with an average acceleration rate of 150 MeV/m. We discuss the system scaling laws for several undulators designs and the methods for laser beam transport over the required distance of a few kilometers.

Date: January 1, 1983

Creator: Pellegrini, C.; Sprangle, P. & Zakowicz, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Induction linacs

The principle of linear induction acceleration is described, and examples are given of practical configurations for induction linacs. These examples include the Advanced Technology Accelerator, Long Pulse Induction Linac, Radial Line Accelerator (RADLAC), and Magnetically-Insulated Electron-Focussed Ion Linac. A related concept, the auto accelerator, is described in which the high-current electron-beam technology in the sub-10 MeV region is exploited to produce electron beams at energies perhap… more

Date: July 1, 1986

Creator: Keefe, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proposal for a study of laser acceleration of electrons using micrograting structures at ATF (Phase 1)

We propose to investigate new methods of particle acceleration using a short-pulse CO{sub 2} laser as the power source and grating-like structures as accelerator cavities''. Phase I of this program is intended to demonstrate the principle of the method. We will focus the laser light to a 3 mm line on the surface of the microstructure. The structure is used to transform the electric field pattern of the incoming transversely polarized laser beam to a mode which has a component along the electron… more

Date: October 29, 1989

Creator: Chen, W.; Claus, J.; Fernow, R. C.; Fischer, J.; Gallardo, J. C.; Kirk, H. G. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Acceleration of electrons by the wake field of proton bunches

This paper discusses a novel idea to accelerate low-intensity bunches of electrons (or positrons) by the wake field of intense proton bunches travelling along the axis of a cylindrical rf structure. Accelerating gradients in excess of 100 MeV/m and large ''transformer ratios'', which allow for acceleration of electrons to energies in the TeV range, are calculated. A possible application of the method is an electron-positron linear collider with luminosity of 10/sup 33/ cm/sup -2/ s/sup -1/. The… more

Date: January 1, 1986

Creator: Ruggiero, Alessandro G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Status of the SLC damping rings

Electron beams of full design energy 1.21 GeV and nearly full design intensity 4 x 10/sup 10/ particles/pulse (design 5 x 10/sup 10/) have been extracted from the Stanford Linac and successfully stored in the electron damping ring. Beams of less intensity have been extracted from the ring and reinjected into the Linac. The present intensity limits are not thought to be fundamental. The operating experience with the electron ring and the status of the construction of the positron ring will be di… more

Date: June 1, 1985

Creator: Hutton, A. M.; Davies-White, W. A.; Delahaye, J. P.; Fieguth, T. H.; Hofmann, A.; Jager, J. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutron skyshine from end stations of the Continuous Electron Beam Accelerator Facility

The MORSE{ }CG code from Oak Ridge National Laboratory was applied to the estimation of the neutron skyshine from three end stations of the Continuous Electron Beam Accelerator Facility (CEBAF), Newport News, VA. Calculations with other methods and an experiment had been directed at assessing the annual neutron dose equivalent at the site boundary. A comparison of results obtained with different methods is given, and the effect of different temperatures and humidities will be discussed.

Date: December 1, 1991

Creator: Sun, Rai-Ko S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Look at energy compression as an assist for high power rf production

The desire to construct electron linacs of higher and higher energies, coupled with the realities of available funding and real estate, has forced machine designers to reassess the limitations in both accelerator gradient (MeV/m) and energy. The gradients achieved in current radio-frequency (RF) linacs are sometimes set by electrical breakdown in the accelerating structure, but are in most cases determined by the RF power level available to drive the linac. In this paper we will not discuss RF … more

Date: August 9, 1984

Creator: Birx, D. L.; Farkas, Z. D. & Wilson, P. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Simple model of beam transport in low-pressure ion-focused regimes

This paper presents a simple model of self-focused beam transport at very low gas pressures, where fractional electric neutralization is incomplete and secondary electrons are expelled from the beam region.

Date: September 1, 1981

Creator: Briggs, R. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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SLC Positron Damping Ring Optics Design

The basic SLAC Linear Collider operation scheme assumes the use of two damping rings, one for the e/sup -/, one for the e/sup +/, in order to reduce the colliding beam normalized emittances to 30 ..pi.. ..mu..radm hence raising the corresponding luminosity by a factor 170. The e/sup -/ damping ring optics, designed by H. Wiedemann, has been extensively studied and modelled since it's completion at the end of 1982. The e/sup +/ damping ring being built will be based on the same design except for… more

Date: April 1, 1985

Creator: Delahaye, J. P. & Rivkin, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Single-bunch beams for BC-75

On June 8, 1983, a beam consisting of a single S-band bunch was transported through the linac into the beam switchyard (BSY) and analyzed in the C-line (Beamline 27) at 30 GeV. The C-line toroid 2712 measured an intensity of approximately 2 x 10/sup 9/e/sup -//pulse. The exact intensity was uncertain due to the limited response time of the toroid for fast, single-bunch beams. However, the linear Q intensity monitors (Lin Q) showed the transmission of the beam through the linac between Sectors 2… more

Date: June 1, 1983

Creator: Sodja, J.; Clendenin, J. E.; Erickson, R. A. & Miller, R. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Pulsed power performance of the new RLA (Recirculating Linear Accelerator)

The Recirculating Linear Accelerator (RLA) is returning to operation with a new electron beam injector and a modified accelerating cavity. Upon completion of our experimental program the RLA will capture the injected beam on an IFR guiding plasma channel in either a spiral or a closed racetrack drift tube. The relativistic beam will be efficiently recirculated for up to four passes through two or more accelerating cavities, in phase with the ringing cavity voltage waveforms, and thereby increas… more

Date: January 1, 1991

Creator: Smith, D. L.; Mazarakis, M. G.; Bennett, L. F. & Olson, W. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Accelerator research studies

The Accelerator Research Studies program at the University of Maryland, sponsored by the Department of Energy under grant number DE-FG05-91ER40642, is currently in the first year of a three-year funding cycle. The program consists of the following three tasks: TASK A, Study of Transport and Longitudinal Compression of Intense, High-Brightness Beams, TASK B, Study of Collective Ion Acceleration by Intense Electron Beams and Pseudospark Produced High Brightness Electron Beams; TASK C, Study of a … more

Date: January 1, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Proton linear accelerators: A theoretical and historical introduction

From the beginning, the development of linear accelerators has followed a number of different directions. This report surveys the basic ideas and general principles of such machines, pointing out the problems that have led to the various improvements, with the hope that it may also aid further progress. After a brief historical survey, the principal aspects of accelerator theory are covered in some detail: phase stability, focusing, radio-frequency accelerating structures, the detailed calculat… more

Date: July 1, 1989

Creator: Lapostolle, P.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Muon beam polarization at the LAMPF Biochemical Channel

Recent modifications to the LAMPF Biomedical Channel have improved versatility for stopping pion and muon physics experiments. High muon polarization was achieved by favorable kinematic selection of the decay muons. This polarization has been measured and found to be close to the design expectation of about 85%. The Hanle method was employed to measure the polarization by observing left-right decay asymmetry at right angles to the beam with small precession fields (0-50 gauss). This technique i… more

Date: January 1, 1985

Creator: Paciotti, M.A.; Bradbury, J.N.; Heffner, R.H.; Leon, M.; Rink, D. & Rivera, O.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Summary of the electron accelerators session

Since the last High Energy Physics Symposium, there has been considerable progress in the field of polarized electron accelerators. Projects well into construction include the SLC, HERA, and LEP. The status of polarized beams for these projects is discussed in this session. Semiclassical and quantum mechanical calculations of polarizing and depolarizing effects are discussed, for both linear colliders and for storage rings. Substantial progress is continuing in the understanding of depolarizing… more

Date: October 1, 1988

Creator: Prescott, Charles Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Operating experience with the 50 MeV 10kA ATA power conditioning system

The Advanced Test Accelerator (ATA) has been operational for over one year and has achieved full parameters in the power conditioning system. The pulsed power system has been previously described, however, during the past year of operation a considerable amount of statistical data has been accumulated on the 211 gas blown spark gaps that perform the main switching function in the ATA. These spark gaps were designed for 250kV, 40 kA and 70ns pulse. The parameter that made this spark gap somewhat… more

Date: June 1, 1984

Creator: Rogers, D.; Lee, F. D.; Newton, M.; Reginato, L.L. & Smith, M.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design study for achromatic and isochronous 180/sup 0/ bending systems for PIGMI. [TRANSPORT]

A Pion Generator for Medical Irradiation (PIGMI) possessing many technical innovations is being developed at the Los Alamos Scientific Laboratory. The heart of the PIGMI facility is a linear accelerator designed to provide a 650-MeV beam of protons at a beam current of 100 ..mu..A. The accelerator will be 120 m long and suitable for installation at major hospital sites. Obviously, a shorter machine may be more convenient to the medical profession. One possibility of reducing the total length of… more

Date: July 1, 1978

Creator: Inoue, H. & Swenson, D.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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NK Muon Beam

The NK Muon Beam will be a modified version of the existing NT beam line. The decision to employ a modified version of the NT beam line was made based on considerations of cost and availability of the beam line. Preliminary studies considered use of other beam lines, e.g., the NW beam line, and even of moving the bubble chamber with its superconducting coils but were rejected for reasons such as cost, personnel limitations, and potential conflicts with other users.

Date: September 28, 1988

Creator: Koizumi, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The Brookhaven Accelerator Test Facility

The Brookhaven Accelerator Test Facility (ATF) will consist of a 50--100 MeV/c electron linac and a 100 GW CO/sub 2/ laser system. A high brightness RF-gun operating at 2856 MHz is to be used as the injector into the linac. The RF-gun contains a Nd:Yag-laser-driven photocathode capable of producing a stream of six ps electron pulses separated by 12.5 ns. The maximum charge in a micropulse will be one nano-Coulomb. The CO/sub 2/ laser pulse length will be a few picoseconds and will be synchroniz… more

Date: January 1, 1988

Creator: Batchelor, K.; Chou, T. S.; Fernow, R. C.; Fischer, J.; Gallardo, J.; Kirk, H. G. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Accelerator Research Studies

The Accelerator Research Studies program at the University of Maryland, sponsored by the Department of Energy under grant number DE-FG05-91ER40642, is currently in the second year of a three-year funding cycle. The program consists of the following three tasks: TASK A, Study of Transport and Longitudinal Compression of Intense, High-Brightness Beams,'' (P.I., M. Reiser); TASK B, Study of Collective Ion Acceleration by Intense Electron Beams and Pseudospark Produced High Brightness Electron Beam… more

Date: January 1, 1993

Item Type: Report

Partner: UNT Libraries Government Documents Department