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in subjects: "Synchrotrons"

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Design and performance of liquid hydrogen target systems for the Fermilab Fixed Target Program

The Fermilab 1990--1991 Fixed Target Program featured six experiments utilizing liquid hydrogen or liquid deuterium targets as part of their apparatus. Each design was optimized to the criteria of the experiment, resulting in variations of material selection, methods of refrigeration and secondary containment. Collectively, the targets were run for a total of 14,184 hours with an average operational efficiency of 97.6%. The safe and reliable operation of these targets was complemented by an inc… more

Date: July 1, 1991

Creator: Allspah, D.; Danes, J.; Peifer, J. & Stanek, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Applications of induction linac technology to heavy ion fusion

Evaluation of the application of heavy ion accelerators to ignite d-t pellets in a thermonuclear reactor is discussed. Accelerator design requirements considered include transport-limited current, beam injection conditions, and pulse bunching and focusing characteristics. The desirability of resonant and non-resonant accelerating structures is comparatively examined. The required power system switch tubes are discussed. It is concluded that heavy ion accelerators could offer a promising solutio… more

Date: July 1, 1977

Creator: Faltens, A. & Keefe, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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THE FERRITE BIASING SYSTEM FOR THE RADIO FREQUENCY CAVITIES OF THE PRINCETON-PENNSYLVANIA 3 Bev PROTON SYNCHROTRON

A description is given of the ferrite biasing system for the four tuned radio frequency cavities of the synchrotron. Each ferrite loaded double cavity has a single turn bias winding which is driven to a peak current of 13,500 amperes by a push-pull transformer arrangement. There is automatic tap changing of the transformer to accommodate the variable impedance load (for power considerations). The programming and frequency response of the system have to be such that each cavity can operate as th… more

Date: August 29, 1962

Creator: Rees, G.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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HIDE working groups. A. Synchrotron based system

A summary is given of a week's discussions on an ion source to target scenario for a synchrotron for heavy ion fusion. Topics considered include: the number of beams on the target; beam dynamics; and a number of areas explicitly identified as needing further work. (PMA)

Date: January 1, 1977

Creator: Barton, M. Q.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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H5 fast-kicker-magnet pulser

The fast extraction kicker magnet for the AGS is powered by a novel pulse generator. A pulse forming network (PFN) is discharged into nearly 100% mismatched load. The pulser delivers a current pulse of 3000 amperes peak pulse with a 2% flat-top ripple into a 1.4 ..mu.. H single turn ferrite core magnet. The pulse is 2.8 ..mu..sec wide with a 180 nsec rise time, at a 0.5 to 1.5 pps repetition rate. The pulse rise time is required to provide clean extraction of the 28 GeV proton beam by bringing … more

Date: January 1, 1982

Creator: Frey, W.; Ghoshroy, S. & Cottingham, J.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent experimental studies on Hadron showers produced in high energy muon-nucleus interactions

The Fermilab Tevatron Muon Experiment has analyzed the hadron showers of events resulting from the scattering of a muon beam (< E{sub {mu}} > = 490 GeV) off H{sub 2}, D{sub 2} and Xenon targets. The topics which will be discussed are: (1) space-time evolution of the hadronization process; (2) leading hadron distributions in the shadowing region; (3) rates and characteristics of 3-jet events. 23 refs.

Date: May 1, 1992

Creator: Morfin, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Manual for COMSYN: A orbit integration code for the study of beam dynamics in compact synchrotrons

COMSYN is a numerical integration code which is written for the study and design of the compact synchrotrons. An improved 4th-order Runge-Kutta method is used in COMSYN to integrate the exact equations of motion in a rectangular coordinate system. The magnetic field components of the dipole B{sub x}, B{sub y} and B{sub z} can be obtained from either measurement or directly computed data (MAGNUS, TOSCA). A spline interpolation method is then used to get the field value at the particle position. … more

Date: October 1, 1991

Creator: Huang, Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Dedicated medical ion accelerator design study. Final report

Results and conclusions are reported from a design study for a dedicated medical accelerator. Basing efforts on the current consensus regarding medical requirements, the resulting demands on accelerator and beam delivery systems were analyzed, and existing accelerator technology was reviewed to evaluate the feasibility of meeting these demands. This general analysis was augmented and verified by preparing detailed preliminary designs for sources of therapeutic beams of neutrons, protons and hea… more

Date: December 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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National Synchrotron Light Source and special radiation-sources development

Design features are presented of the two high current electron storage rings comprising the National Synchrotron Light Source and its basic parameters are enumerated. In addition, an overview is presented of the special radiation sources under construction and development, including a superconducting wiggler, permanent magnet wiggler, x-ray and vuv undulators, free electron laser source and Compton backscattered ..gamma.. source.

Date: January 1, 1982

Creator: van Steenbergen, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Method to rapidly tune the halo spoilers of the tevatron muon beam

An active shield has been constructed which forms a sharp magnetic edge around the central core of useful muons and sweeps the envelope of halo muons (those that enter the aperture of an experiment without having passed through the momentum tagging system) radially away from beam center. Two types of halo scrapers have been employed in this shield: conventional toroidal magnets and a newly developed magnetic element called ''mupipe''. The mupipes have eight degrees of motion, so attempting to t… more

Date: September 1, 1986

Creator: Ojeda, Y.; Scott, B.; Malensek, A. & Morfin, J.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Tandems as injectors for synchrotrons

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 accelerators still provides the most reliable and best performance.

Date: January 1, 1992

Creator: Ruggiero, Alessandro G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nonequilibrium Ionization in Magnetohydrodynamic Generators

The steady state ionization of a gas in which the electrons are hot and the atoms cool is investigated. The rate equations governing ionization, excitation, recombination, and de-excitation are solved for a model system using rate coefficients appropriate to the Cs atom. Included are all processes involving free electrons as well as spontaneous emission and resonance trapping of radiation. No incoming radiation is assumed, and the system is assumed large compared with a collisional mean free pa… more

Date: January 1, 1962

Creator: BenDaniel, D.J. & Tamor, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Slope Parameter for the Differential Cross-Section for the Reaction p + d. -->. X + d in the Region of Small Momentum Transfer at Fermilab Energies

A deuterium gas jet target was used in the circulating beam of the Fermilab accelerator to study the M/sup 2//sub x/ and s dependence and the slope parameter for pd ..-->.. Xd in the region 0.025 less than or equal to vertical bar t vertical bar less than or equal to 0.17 (GeV/c)/sup 2/ and 5 less than or equal to M/sup 2//sub x/ less than or equal to 0.068s GeV/sup 2/. A simple parametrization in terms of the variable (1 - x) is found.

Date: June 1, 1980

Creator: Akimov, Yu. K.; Bartenev, V. D. & Izyurov, V. M.

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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Beauty physics at the ultrahigh energies of the ELOISATRON (Euroasiatic Long Intersecting Superconducting Accelerator Synchrotron)

The potential for experimentally studying B physics at the proposed INFN 100 TeV ELOISATRON (Euroasiatic Long Intersecting Superconducting Accelerator Synchrotron) is compared with possibilities at 40 TeV at the Superconducting Super Collider. The effect of the increase in center of mass energy on the production and decay of B mesons has been investigated, particularly with respect to the accummulation of large samples of B hadron decays necessary for the detection of CP violating effects. 13 r… more

Date: February 1, 1988

Creator: Cox, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characteristics of synchrotron radiation and of its sources

Synchrotron light emission and the classical relativistic electromagnetic theory describing it are reviewed. The electron optics of storage rings are considered in some detail, beginning with the ideal electron orbit and the distribution which electrons take around it. This is folded with the process of synchrotron light emission itself to define the effective photon source. The predictions of classical relativistic theory are compared with experiment, and one finds agreement within the experim… more

Date: January 1, 1979

Creator: Krinsky, S.; Perlman, M. L. & Watson, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The relativistic heavy ion collider project: An overview

We have now seen the first results from experiments with high energy nuclear beams at Brookhaven and CERN. These experiments, which began about a year ago, use fixed targets at the AGS and SPS. These programs have begun with relatively light ions (A less than or equal to 32 amu) to explore states of compressed nuclear matter in which high energy density is achieved in an environment of high baryon density at energies near the maximum for nuclear stopping. The widespread interest and excitement … more

Date: January 1, 1987

Creator: Ludlam, T. W. & Samios, N. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Air flow into the LBL Bevatron

The Lawrence Berkeley Laboratory is currently installing an improved liner in its Bevatron. The new liner will be capable of producing a vacuum of 2 x 10/sup -8/ N/M/sup 2/ (1.5 x 10/sup -10/ Torr) and a temperature on the order of 12K. There has been concern for quite some time about possible damage to the liner in the event of a beam line window breaking allowing atmospheric air to rush into the vacuum. The installation of the new more fragile liner has heightened this concern. This effort is… more

Date: September 1, 1979

Creator: Williams, J.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Acceleration of heavy ions to very high energies

The current interest of physicists in the collisions of heavy ions closes an interesting circle in the technology of accelerator building. The first cyclic accelerator, built by R. Wideroe, was a linear accelerator designed to accelerate potassium ions. Subsequent to Wideroe's achievement, much of the art of accelerator construction has been devoted to creating energetic beams of electrons and protons. Now we find ourselves returning to the heavy ions, and Wideroe's linear accelerator structure… more

Date: January 1, 1982

Creator: Barton, M. Q.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Simulation of synchrotron motion with rf noise

The theoretical formulation is described that is behind an algorithm for synchrotron phase-space tracking with rf noise and some preliminary simulation results of bunch diffusion under rf noise obtained by actual tracking.

Date: August 1, 1986

Creator: Leemann, B.T.; Forest, E. & Chattopadhyay, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Shielding of Tevatron Meson Laboratory target piles - M-west, M-center, M-polarized

This note reports on shielding calculations pertinent to the new target piles planned for the Meson Detector Building. The primary emphasis here is upon the external dose equivalent rates and groundwater activation. A previous TM describes the activation of the target, sweeping magnet cooling water, and beam sweeping magnets. A separate note summarizes the radiation protection aspects of the muon radiation due to all four meson target piles and is attached.

Date: December 1, 1983

Creator: Cossairt, J.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Possibilities for x-ray holography using synchrotron radiation

Since the theoretical and experimental demonstrations of the effectiveness of soft x-rays in imaging biological material there has been considerable study given to the prospects for further development of the presently existing techniques. This has been motivated to a large extent by advances in source technology, particularly the use of undulators on electron storage rings and recent improvements in short wavelength lasers. The present author has carried out theoretical evaluations of the poss… more

Date: November 1, 1983

Creator: Howells, M.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Delay line proportional chambers for the Fermilab external muon identifier

Thirty-nine one meter square proportional chambers with delay line readout were constructed for the external muon identifier of the Fermilab 15 foot bubble chamber. They provide X,Y,U(45/sup 0/) and T (avalanche time) information using a single wire plane, etched strip cathodes and nine amplifiers. They have a time resolution of +-27ns, single particle spatial resolution of +-2 to +-3mm and double particle resolution of approximately 2/sup 1///sub 2/ to 4cm. The energy accessible to each wire i… more

Date: October 19, 1977

Creator: Parker, S.; Orthel, J. & Marriner, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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IPNS enriched uranium booster target

Since startup in 1981, IPNS has operated on a fully depleted /sup 238/U target. With the booster as in the present system, high energy protons accelerated to 450 MeV by the Rapid Cycling Synchrotron are directed at the target and by mechanisms of spallation and fission of the uranium, produce fast neutrons. The neutrons from the target pass into adjacent moderator where they slow down to energies useful for spectroscopy. The target cooling systems and monitoring systems have operated very relia… more

Date: January 1, 1985

Creator: Schulke, A.W. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department