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Computing tools for accelerator design

Description: An algorithm has been developed that calculates and obtains information about nonlinear contributions in accelerators. The comparison of the results obtained from this program ''NONLIN'' and HARMON is discussed and illustrated for the SSC-CDR clustered lattices.
Date: June 1, 1986
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Analytical method for treatment of nonlinear resonances in accelerators

Description: An analytical method has been developed for investigating the nonlinear effects on the dynamical systems such as circular accelerators including the perturbation of tune; emittance growth; Hamiltonian resonance strength; generating function resonance strengths; fixed points; Chirikov criteria; island width, etc. We have incorporated some of our results into an algorithm which we used to study the structure resonances in the Booster, RHIC, and the SSC. A brief theoretical discussion is given. Using program NONLIN the structure resonances of the SSC CDR clustered lattice are analyzed and some of the results are tabulated.
Date: January 1, 1986
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Booster parameter list

Description: 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, radio frequency acceleration system, and the tunnel. 60 refs., 41 figs. (LEW)
Date: October 1, 1986
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Beam aperture and emittance growth in the AGS Booster

Description: We have developed analytical tools for calculating the variation of particle action, smear and emittance growth due to nonlinear elements in accelerators (with second order perturbation theory in two dimensions). Our results for the AGS-Booster is presented.
Date: January 1, 1987
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Accelerator dynamics and beam aperture

Description: We present an analytical method for analyzing accelerator dynamics, including higher order effects of multipoles on the beam. This formalism provides a faster alternative to particle tracking. Simplectic expressions for the emittance and phase describing the dynamical behavior of a particle in a circular accelerator are derived using second order perturbation theory (in the presence of nonlinear elements, e.g., sextupoles, octupoles). These expressions are successfully used to calculate the emittance growth, smear and linear aperture. Our findings compare well with results obtained from tracking programs. In addition perturbation to betatron tune; resonance strengths; stop bandwidth; fixed points; island width; and Chirikov criteria are calculated.
Date: October 1, 1986
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Second order perturbation in the AGS Booster

Description: We have developed an analytical method for examining the nonlinear effects in accelerators including the Hamiltonian resonance strengths, generating functions resonance strengths, fixed points, Chirikov Criteria, island width, perturbation of tune, emittance growth, etc. We incorporated some of our findings into an algorithm which we used to investigate the structure resonances in the SSC and the AGS-Booster.
Date: January 1, 1987
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Chromatic perturbation and resonance analysis for the AGS Booster

Description: We have investigated the nonlinear effects with the emphasis on nonlinear resonances. We present some of our findings (e.g., the structure resonances; stop-bandwiths, etc.) for the AGS-Booster Lattice using program HARMON. Comparison with the results obtained from our algorithm ''NONLIN'' is presented.
Date: January 1, 1987
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Code comparison for accelerator design and analysis

Description: We present a comparison between results obtained from standard accelerator physics codes used for the design and analysis of synchrotrons and storage rings, with programs SYNCH, MAD, HARMON, PATRICIA, PATPET, BETA, DIMAD, MARYLIE and RACE-TRACK. In our analysis we have considered 5 (various size) lattices with large and small angles including AGS Booster (10/degree/ bend), RHIC (2.24/degree/), SXLS, XLS (XUV ring with 45/degree/ bend) and X-RAY rings. The differences in the integration methods used and the treatment of the fringe fields in these codes could lead to different results. The inclusion of nonlinear (e.g., dipole) terms may be necessary in these calculations specially for a small ring. 12 refs., 6 figs., 10 tabs.
Date: January 1, 1988
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Guide to accelerator physics program SYNCH: VAX version 1987. 2

Description: This guide is written to accommodate users of Accelerator Physics Data Base BNLDAG::DUAO:(PARSA1). It describes the contents of the on line Accelerator Physics data base DUAO:(PARSA1.SYNCH). SYNCH is a computer program used for the design and analysis of synchrotrons, storage rings and beamlines.
Date: January 1, 1987
Creator: Parsa, Z. & Courant, E.
Partner: UNT Libraries Government Documents Department

Predicted properties of the W/sup +/,W/sup -/ and Z/sup 0/

Description: Predicted properties of the W/sup +/,W/sup -/ and Z/sup 0/ bosons in the standard SU(2) x U(1) model are presented. For the current value of the weak mixing angle, sin/sup 2/ theta/sub W/(m/sub W/) = 0.215 +- 0.014, one finds m/sub W/ = 83.0(+3.0,-2.8) GeV and m/sub Z/ = 93.8(+2.5,-2.4) GeV. Implications of deviations from these predictions are discussed. decay rates and branching ratios for the W/sup +/,W/sup -/ and Z/sup 0/ are given. Radiative corrections, higher order rare decays and exotic possibilities are described.
Date: January 1, 1982
Creator: Marciano, W.J. & Parsa, Z.
Partner: UNT Libraries Government Documents Department

Selected topics in particle accelerators: Proceedings of the CAP meetings. Volume 5

Description: This Report includes copies of transparencies and notes from the presentations made at the Center for Accelerator Physics at Brookhaven National Laboratory Editing and changes to the authors` contributions in this Report were made only to fulfill the publication requirements. This volume includes notes and transparencies on nine presentations: ``The Energy Exchange and Efficiency Consideration in Klystrons``, ``Some Properties of Microwave RF Sources for Future Colliders + Overview of Microwave Generation Activity at the University of Maryland``, ``Field Quality Improvements in Superconducting Magnets for RHIC``, ``Hadronic B-Physics``, ``Spiking Pulses from Free Electron Lasers: Observations and Computational Models``, ``Crystalline Beams in Circular Accelerators``, ``Accumulator Ring for AGS & Recent AGS Performance``, ``RHIC Project Machine Status``, and ``Gamma-Gamma Colliders.``
Date: October 1, 1995
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Selected topics in particle accelerators: Proceedings of the CAP meetings. Volume 4

Description: This Report includes copies of transparencies and notes from the presentations made at the Center for Accelerator Physics at Brookhaven National Laboratory. Editing and changes to the authors` contributions in this Report were made only to fulfill the publication requirements. This volume includes notes and transparencies on eight presentations: ``Application of Accelerator-Driven Spallation Targets - Including Tritium Production and Nuclear Waste Transmutation``, ``BNL 5 MW Pulsed Spallation Neutron Source Study``, ``Designing and Understanding of Magnets with the Help of Conformal Mapping``, ``Laser - Electron Beam Scattering Coherent Compton X-Ray Sources``, ``The LHC Project``, ``Optimization of the Photocathode-Linac Separation for the ATF [Accelerator Test Facility] Injection System``, ``On CEBAF Commissioning: First Results``, and ``The Proposed Booster Application Facility at BNL``. An Appendix lists dates, topics, and speakers from October 1989 to December 1994.
Date: October 1, 1995
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Selected topics in particle accelerators: Proceedings of the CAP meetings. Volume 3

Description: This Report includes copies of transparencies and notes from the presentations made at the Center for Accelerator Physics at Brookhaven National Laboratory. Editing and changes to authors` contributions in this Report were made only to fulfill the publication requirements. This volume includes notes and transparencies on eight presentations: ``Inverse Cherenkov Laser Acceleration of Electron Beams``, ``High Brightness Field Emission Cathodes``, ``QCD/Teraflop Collaboration: The Future of Supercomputing``, ``Report on Dipole R&D``, ``Reaching Maximum Luminosity in Hadron Colliders at 10-100 TeV``, ``STAR Collaboration Project Status Report: Quarks and Gluons``, ``PHENIX Collaboration Project Status Report``, and ``Update on Status of BNL Relativistic Heavy Ion Collider (RHIC) Project: RHIC Design Issues.``
Date: October 1995
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

On dynamic aperture

Description: Nonlinear perturbation can alter the beam behavior in dynamical systems. For example, nonlinear fields due to sextupoles or octupoles can perturb the motion of the beam of particles in accelerators. If the perturbation is increased, at some point, the motion of the beam become unstable and chaotic. In the Superconducting Super Collider (SSC) a proton would interact 10{sup 12} times (in {approximately}10{sup 9} revolutions) with the local nonlinear magnetic fields which can cause the deviations, of the beams from the designed orbit, and lead to loss of particles. We present an analytical method to study the beam stability in large accelerators such as SSC, (and an alternate to using kick'' approximation (particle tracking) over large time intervals). This includes stability factor f'' which determines the convergence of the superconvergent perturbation theory, and the behavior of the system, e.g., stable if f > 1, and unstable if f < 1. The critical point where the system makes the transition from stable (f > 1) to chaotic (f < 1) behavior corresponds to f = 1, the point at which the size of the beam is defined as the dynamic aperture in accelerators. 10 refs.
Date: January 1, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Effects of variation of the laser pulse width on the laser induced photoelectrons

Description: The effects of the variation of the Laser pulse width on the laser induced photoelectrons, from the BNL gun is presented, including the variation in the emittance of the beam, which is crucial to the operation of a Free Electron Laser (FEL). The radio-frequency (RF) electron gun with a photocathode in the end wall of an RF cavity is excited by a laser pulse that is synchronized with the RF, is powered by a conventional type SLAC klystron, and is designed to produce a low emittance beam of 4.65 MeV at the gun exit with the field gradient of 100 MV/m on the Cathode.
Date: January 1, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Beam emittance and the effects of the rf, space charge and wake fields: Application to the ATF photoelectron beam

Description: Laser driven photoelectron guns are of interest for use in new methods of accelerations, future development of Linear Colliders and new experiments such as Free Electron laser (IFEL). Such guns are potential source of low emittance-high current and short bunch length electron beams, where the emitted electrons are accelerated quickly to a relativistic energy by a strong rf, electric field in the cavity. We present a brief overview of the beam dynamic studies, e.g. emittance for the Brookhaven National Laboratory (BNL) ATF high brightness photocathode radio frequency gun (now in operation), and show the effects of the rf, Space Charge, and Wake fields on the photoelectrons. 4 refs., 7 figs.
Date: January 1, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Space charge and wake field analysis for a high brightness electron source

Description: We present a brief overview of the formalism used, and some simulation results for transverse and longitudinal motion of a bunch of particles moving through a cavity (e.g., the Brookhaven National Laboratory high brightness photocathode gun), including effects of the accelerating field, space charge forces (e.g., arising from the interaction of the cavity surface and the self field of the bunch). 3 refs., 12 figs.
Date: January 1, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Accelerator physics and modeling: Proceedings

Description: This report contains papers on the following topics: Physics of high brightness beams; radio frequency beam conditioner for fast-wave free-electron generators of coherent radiation; wake-field and space-charge effects on high brightness beams. Calculations and measured results for BNL-ATF; non-linear orbit theory and accelerator design; general problems of modeling for accelerators; development and application of dispersive soft ferrite models for time-domain simulation; and bunch lengthening in the SLC damping rings.
Date: January 1, 1991
Creator: Parsa, Z. (ed.)
Partner: UNT Libraries Government Documents Department

Analysis of a high brightness photo electron beam with self field and wake field effects

Description: High brightness sources are the basic ingredients in the new accelerator developments such as Free-Electron Laser experiments. The effects of the interactions between the highly charged particles and the fields in the accelerating structure, e.g. R.F., Space charge and Wake fields can be detrimental to the beam and the experiments. We present and discuss the formulation used, some simulation and results for the Brookhaven National Laboratory high brightness beam that illustrates effects of the accelerating field, space charge forces (e.g. due to self field of the bunch), and the wake field (e.g. arising from the interaction of the cavity surface and the self field of the bunch).
Date: January 1, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Proceedings of the CAP meetings, November 1990--February 1991

Description: This report contains viewgraph material on the following topics: on beam emittance -- application to ATF; a review of Brookhaven Accelerator Test Facility (AFT); on development of a superconducting RFQ at Stony Brook University; development of new methods for charged particle acceleration at Yerevan Physics Institute; theory of high gain free electron laser; on ultra violet free electron laser at BNL; high luminosity at SSC; and nonlinear dynamics studies of accelerators.
Date: January 1, 1991
Creator: Parsa, Z. (ed.)
Partner: UNT Libraries Government Documents Department

Transverse space-charge effects in the AGS booster during injection

Description: We have analyzed the transverse motion for 200 MeV protons under strong space-charge conditions. We considered up to 5 /times/ 10/sup 12/ protons per bunch; for the assumed distribution this corresponds to a maximum tune shift of /minus/0.75. We utilized single particle tracking to study the motion in normalized phase space as a function of initial particle amplitude. Subsequent FFT analyses were used to obtain the fractional betatron tunes at different z values along the bunch. The motion shows x /minus/ y coupling due to the so-called Montague resonance (2Q/sub x//minus/2Q/sub y//equals/0). Perturbations arise when particles have tunes in the neighborhood of the 2Q /equals/ 9 half-integral resonances but losses do not occur. It appears that the motion is stabilized simply due to the strong amplitude dependence of the tunes. 2 refs., 5 figs., 4 tabs.
Date: April 29, 1988
Creator: Colton, E.P.; Shi, D. & Parsa, Z.
Partner: UNT Libraries Government Documents Department

Analysis of a high brightness photo electron beam with self field and wake field effects

Description: High brightness sources are the basic ingredients in the new accelerator developments such as Free-Electron Laser experiments. The effects of the interactions between the highly charged particles and the fields in the accelerating structure, e.g. R.F., Space charge and Wake fields can be detrimental to the beam and the experiments. We present and discuss the formulation used, some simulation and results for the Brookhaven National Laboratory high brightness beam that illustrates effects of the accelerating field, space charge forces (e.g. due to self field of the bunch), and the wake field (e.g. arising from the interaction of the cavity surface and the self field of the bunch).
Date: December 31, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Effects of variation of the laser pulse width on the laser induced photoelectrons

Description: The effects of the variation of the Laser pulse width on the laser induced photoelectrons, from the BNL gun is presented, including the variation in the emittance of the beam, which is crucial to the operation of a Free Electron Laser (FEL). The radio-frequency (RF) electron gun with a photocathode in the end wall of an RF cavity is excited by a laser pulse that is synchronized with the RF, is powered by a conventional type SLAC klystron, and is designed to produce a low emittance beam of 4.65 MeV at the gun exit with the field gradient of 100 MV/m on the Cathode.
Date: December 31, 1991
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department

Effects of the third order transfer maps and solenoid on a high brightness beam

Description: We present a sketch of the formulation for obtaining Lie algebraic transfer maps for the solenoid through third order and its effect on the beam of charged particles. We discuss simulation results showing effects of solenoids on the laser driven high brightness photoelectrons for the proposed alternate injection system for Brookhaven Accelerator Test Facility.
Date: May 1, 1993
Creator: Parsa, Z.
Partner: UNT Libraries Government Documents Department