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in subjects: "Synchrotrons 430400* -- Particle Accelerators-- Storage Rings"

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The AGS-Booster lattice

The AGS Booster has three objectives. They are to increase the space charge limit of the AGS, to increase the intensity of the polarized proton beam by accumulating many linac pulses (since the intensity is limited by the polarized ion source), and to reaccelerate heavy ions from the BNL Tandem Van de Graaff before injection into the AGS. The machine is capable of accelerating protons at 7.5 Hertz from 200 MeV to 1.5 GeV or to lower final energies at faster repetition rates. The machine will al… more

Date: January 1, 1987

Creator: Lee, Y. Y.; Barton, D. S.; Claus, J.; Cottingham, J. G.; Courant, E. D.; Danby, G. T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A stretcher for the Brookhaven AGS

This paper summarizes the conceptual design of a 30 GeV Stretcher ring, which is designed to increase the capacity and the quality of the experimental physics program at the AGS. In a typical 3 second operating cycle the AGS now accomplishes two functions: accelerating the beam to full energy and then providing a slow spill on a 30 GeV flattop. These tasks consume approximately equal time. The proposed Stretcher, a dc storage ring, will take up the task of distributing the high energy beam with… more

Date: January 1, 1989

Creator: Foelsche, Horst W. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Method for compensating bellows pressure loads while accommodating thermal deformations

Many metal bellows are used on storage ring vacuum chambers. They allow the ring to accommodate deformations associated with alignment, mechanical assembly and thermal expansion. The NSLS has two such electron storage rings, the vuv ring and the x-ray ring. Both rings utilize a number of welded metal bellows within the ring and at every beam port. There are provisions for 16 beam ports on the vuv and 28 ports in the x-ray ring. At each of these locations the bellows are acted on by an external … more

Date: January 1, 1985

Creator: Woodle, M.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Experiments on stochastic cooling of 200 MeV protons

Equipment for the stochastic cooling of 200 MeV protons in the Fermilab cooler ring has been installed and operated. Vertical and longitudinal cooling systems were installed by early 1980 and had successfully operated by May 1980. Traveling-wave structures particularly effective for the sub-relativistic beam velocities were used for the pickup and kicker electrodes.

Date: March 1981

Creator: Lambertson, G. R.; Bisognano, J.; Flood, W.; Kim, K.; Leeman, C.; Leskovar, B. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spectrometer coupled to an electron storage ring for tagging laser backscattered gamma rays

A spectrometer has been designed to momentum analyze electrons, from the 2.5 to 3.0 GeV x-ray storage ring of the National Synchrotron Light Source at Brookhaven National Laboratory, that have lost energy from the production of high energy ..gamma..-rays by Compton scattering of laser light. The electrons detected in the focal plane will provide a tag for the backscattered ..gamma..-rays, determining their energy (to 2.3 MeV), and timing. This design utilizes the fact that, due to kinematics, t… more

Date: January 1, 1982

Creator: Thorn, C. E.; LeVine, M. J. & Sandorfi, A. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tuning the rf cavity by using a detuning loop

The tuning of the rf cavity with a coupling loop connected to a variable capacitor or an open or shorted coaxial line is described. Two kinds of equivalent circuits are described and some of the calculations of ..delta..f and Q vs capacitance curves are given. At 52 MHz the maximum practical tuning range is about 100 KHz, if the parameters of tuning circuit are chosen properly so that the Q of the accelerating cavity does not decrease too much.

Date: September 1, 1985

Creator: Wang, Y. M.; Keane, J. & Batchelor, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The AGS Booster main ring power supply system

The AGS Booster is being designed as a very versatile particle accelerator. Its primary function is to be a high quality injector to the currently operating Alternating Gradient Synchrotron (AGS). The Booster/AGS combination will produce proton intensities greater than 5 {times} 10{sup 13}protons per pulse (ppp), and accelerate heavy ions, with mass up to 200, to a maximum energy of 15 GeV per atomic mass unit (GeV/amu). The power supply for the Booster Main Ring (BMRPS) has to accommodate a wi… more

Date: January 1, 1989

Creator: Soukas, A.; Hughes, K.; Sandberg, J.; Toldo, F. & Zhang, S.Y. (Brookhaven National Lab., Upton, NY (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Performance and upgrades of the NSLS storage rings and photon sources

The usefulness of synchrotron radiation sources is not only determined by current, energy and magnetic field but also orbit stability and lifetime. The status and developments at NSLS in storage ring performance are discussed. Efforts at NSLS to look toward the future in source development are presented. In particular, small gap undulator development and studies toward development of UV Free Electron Laser at the Accelerator Test Facility are described. 5 refs., 2 figs., 1 tab.

Date: January 1, 1991

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-level control programs at NSLS

The mathematical model of an accelerator can be used to control its operation and also to simulate its behavior. Through the use of such modeling programs it is possible to control a few important machine parameters rather than the many individual magnets. Such programs have been implemented for the current generation of accelerators. At the NSLS, two control program systems have been developed; TRANCO for the transport lines and RING for the accelerator/storage rings. These systems are modular… more

Date: January 1, 1983

Creator: Bozoki, E.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Using the circulating beam in the Fermilab antiproton accumulator for experiments

The Fermilab Accumulator is a storage ring optimized for stacking and stochastic cooling 8 GeV antiprotons for the Tevatron collider. Minor modifications have been made to provide for beam in the energy range 8.0-2.9 GeV of luminosity /approximately/10/sup 31/cm/sup -2/s/sup - 1/ with a hydrogen jet internal target. Experience to date consists of machine studies and detector engineering run with protons. 7 refs.

Date: August 15, 1988

Creator: MacLachlan, J.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Pressure and lifetime behavior of NSLS storage rings

Several contributions to the total beam lifetime in an electron storage ring are briefly discussed, including the transverse distribution of electrons in the bunch, the Touschek effect, beam-gas interactions, and various instabilities. Conditioning of the NSLS vuv and x-ray rings is described. The pressure-lifetime performance of the two rings are then presented. (LEW)

Date: January 1, 1986

Creator: Halama, H.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Final design and status of the NSLS vacuum system

We describe the final system, as built, reasons for changes and the general status of the NSLS. The NSLS is a dedicated facility for the purpose of producing synchrotron radiation. It consists of an electron linac-booster injector system, and two storage rings, one for uv research and the other for x-ray research. (Synchrotron radiation is produced by accelerating electrons in the storage rings.) The design current and energies are 1000 ma at 700 MeV for the vuv ring and 500 ma at 2.5 GeV for t… more

Date: January 1, 1982

Creator: Schuchman, J.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design status of the 2. 5 GeV National Synchrotron Light Source x-ray ring

The present state of the design of the 2.5 GeV electron storage ring for the National Synchrotron Light Source is described. This ring will serve as a dedicated source of synchrotron radiation in the wavelength range 0.1 A to 30 A. While maintaining the basic high brigtness features of the eariler developed lattice structure, recent work resulted in a more economical magnet system, is simplified chromaticity corrections, and improved distribution of the X-ray beam lines. In addition, the adequa… more

Date: January 1, 1979

Creator: Krinsky, S.; Blumberg, L.; Bittner, J.; Galayda, J.; Heese, R.; Schuchman, J.C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Progress and status of the AGS Booster project

New physics opportunities, such as: rare K-decay, neutrino and heavy ion physics demand that a rapid-cycling high vacuum and high intensity Booster be built for the AGS at Brookhaven National Laboratory. The circumference of the Booster ring is one-quarter that of the AGS. Three modes of operation for various particles are envisioned. For unpolarized protons, four Booster pulses would be injected at a 7.5 Hz repetition rate within a 400 ms flat bottom of the AGS, enabling the present 1.5 {times… more

Date: January 1, 1989

Creator: Weng, W.T. (Brookhaven National Lab., Upton, NY (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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An ultra-precise storage ring for the muon g -- 2 measurement

An ultra precise 3 GeV/c storage ring with a 14.5 kG super-ferric magnet is under construction at the Brookhaven AGS for the measurement of the muon anomalous magnetic moment to 0.35 ppM accuracy. This requires a magnetic field with is constant to {approx} 1 ppM and is known sufficiently well that the magnetic field integral averaged over the muon orbits can be calculated to 0.1 ppM. First the magnetic field will be statically shimmed by various techniques. Pole face winding will be used for fi… more

Date: January 1, 1989

Creator: Brown, D.; DeWinter, T.; Hazen, E.; Heisey, C.; Kerosky, B.; Krienen, F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Mapping of trace elements with photon microprobes: x-ray fluorescence with focussed synchrotron radiation

High energy electron synchrotron storage rings provide copious quantities of polarized photons that make possible the mapping of many trace elements with sensitivities at the parts per billion (ppB) level with spatial resolutions in the micrometer range. The brightness of the x-ray ring of the National Synchrotron Light Source (NSLS), presently being commissioned, will be five orders of magnitude larger than that of the bremsstrahlung spectrum of state-of-the-art rotating anode tubes. We will d… more

Date: April 1, 1985

Creator: Hanson, A. L.; Jones, K. W.; Gordon, B. M.; Pounds, J. G.; Rivers, M. L. & Schidlovsky, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Landau damping due to tune spreads in betatron amplitude and momentum

Due to the large space charge transverse impedance in a low energy synchrotron, the coherent tune shift causes the Landau damping to be ineffective in damping the transverse coherent motion. We analyze the effect of Landau damping that is caused by the tune spreads of the betatron amplitude (space charge and/or octupole) and momentum. We find that the Landau damping becomes more significant in our two dimensional analysis. 5 refs.

Date: January 1, 1989

Creator: Lee, S. Y.; Tran, P. & Weng, W. T. (Brookhaven National Lab., Upton, NY (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electrical and magnetic properties of the energy-saver correction elements

The lattice of the Fermi National Accelerator Laboratory's Energy Saver/Doubler contains a group of superconducting correction windings associated with each quadrupole. These are housed in an element referred to as a spool. There are 192 spools in the ring plus 12 special power spools which contain the main buss 5000 ampere power input as well as correction elements. There will be constructed and tested 290 spools, including spares of each of the eight different types. There have been 266 indiv… more

Date: August 1, 1983

Creator: Johnson, M.; McInturff, A.; Raja, R. & Mantsch, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design of a 6 Tesla wiggler for the National Synchrotron Light Source

A 6-pole, 6 Tesla wiggler with Nb-Ti superconducting windings has been designed, to be installed in a straight section of the 2.5 GeV x-ray storage ring of the NSLS. The technical problems of this magnet are discussed, in particular the optimization of the two-layer magnetic windings and the mechanical structure designed to counteract the strong magnetic forces. The effects of the insertion of the wiggler in the storage ring lattice are also studied.

Date: January 1, 1981

Creator: Hsieh, H.; Krinsky, S.; Luccio, A. & van Steenbergen, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Conventional magnet storage rings for x-ray lithography

A first pass at the design of a conventional magnet storage ring for x-ray lithogrphy is presented. Electron beam size and power specifications are given, followed by a first pass at a lattice - a 4-fold symmetric, gradient FODO cell lattice using B = 1.6 Tesla C-magnets. (LEW)

Date: October 1, 1986

Creator: Bassetti, M.; Batchelor, K.; Galayda, J.; Halama, H.; Heese, R.; Hsieh, H. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Estimate of the coupling impedance for the storage rings of the NSLS

The most important ingredient to evaluate the stability of a particle beam in a storage ring is the longitudinal coupling impedance Z/n and the transverse impedance Z/sub perpendicular/ which is usually associated to the former. These impedances are calculated for the two storage rings which are part of the NSLS, namely the Ultra Violet Ring (UVR) and the X-Ray Ring (XRR)-the parameters for these two rings which are used throughout the paper are shown.

Date: August 1, 1979

Creator: Ruggiero, A. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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National synchrotron light source in the infra-red region

A discussion of the utilization of the NSLS in the 1 to 100 micron infra-red spectral region is presented. A comparison is made of the respective brightnesses of the NSLS and of black-body sources. The way in which each source may be utilized with a monochromator is discussed and comparative exit slit brightnesses are calculated for selected cases.

Date: January 1, 1981

Creator: Williams, G. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Problem of magnet ramping

In the accelerator rings, the momentum of the beam is being changed. It is necessary to ramp (up or down) all magnets in the ring in perfect synchronism and precisely according to a desired ramping function to prevent beam losses or unwanted changes in the beam characteristics (e.g., tune or chromaticity). The ramping function is discussed along with its implementation in a microprocessor controlled function generator. 4 references.

Date: January 1, 1983

Creator: Bozoki, E.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Muon storage

Protons are accelerated to 10/sup 3/ GeV/c in the energy doubler/saver ring (ED/S). They are extracted, targeted, and pions are collected in the main ring at an energy of approximately 100 GeV/c. The pions decay (tau/sup ..pi../sub lab/ at 100 GeV/c approximately equal to 20 ..mu..s), giving birth to a muon beam. This muon beam can be extracted or bumped onto an internal target. The number of muons expected is calculated. The large aperture of the ED/S may allow a time averaged flux of as high … more

Date: January 1, 1976

Creator: Humphrey, J. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department