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Title: IBS in a CAM-Dominated Electron Beam

Abstract

We report on the performance and planned upgrades to the Fermilab Accumulator Stacktail Stochastic Cooling System. The current system has achieved a maximum flux of 16.5e10/hour, limited by the input flux of antiprotons. The upgrades are designed to handle flux in excess of 40e10/hour.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
878998
Report Number(s):
FERMILAB-CONF-05-462-AD
TRN: US0700919
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.821:159-163,2006; Conference: Presented at International Workshop on Beam Cooling and Related Topics (COOL05), Eagle Ridge, Galena, IL, USA, 18 - 23 Sep 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ANTIPROTONS; BEAM COOLING; ELECTRON BEAMS; FERMILAB; PERFORMANCE; STOCHASTIC COOLING; TANKS; Accelerators

Citation Formats

Burov, Alexey V., /Fermilab, Gusachenko, I., /Novosibirsk State U., Nagaitsev, S., /Fermilab, Shemyakin, A., and /Fermilab. IBS in a CAM-Dominated Electron Beam. United States: N. p., 2005. Web.
Burov, Alexey V., /Fermilab, Gusachenko, I., /Novosibirsk State U., Nagaitsev, S., /Fermilab, Shemyakin, A., & /Fermilab. IBS in a CAM-Dominated Electron Beam. United States.
Burov, Alexey V., /Fermilab, Gusachenko, I., /Novosibirsk State U., Nagaitsev, S., /Fermilab, Shemyakin, A., and /Fermilab. Thu . "IBS in a CAM-Dominated Electron Beam". United States. doi:. https://www.osti.gov/servlets/purl/878998.
@article{osti_878998,
title = {IBS in a CAM-Dominated Electron Beam},
author = {Burov, Alexey V. and /Fermilab and Gusachenko, I. and /Novosibirsk State U. and Nagaitsev, S. and /Fermilab and Shemyakin, A. and /Fermilab},
abstractNote = {We report on the performance and planned upgrades to the Fermilab Accumulator Stacktail Stochastic Cooling System. The current system has achieved a maximum flux of 16.5e10/hour, limited by the input flux of antiprotons. The upgrades are designed to handle flux in excess of 40e10/hour.},
doi = {},
journal = {AIP Conf.Proc.821:159-163,2006},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}

Conference:
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  • Electron cooling of the 8.9 GeV/c antiprotons in the Recycler ring requires high-quality dc electron beam with the current of several hundred mA and the kinetic energy of 4.3 MeV. That high electron current is attained through beam recirculation (charge recovery). The primary current path is from the magnetized cathode at high voltage terminal to the ground, where the electron beam interacts with the antiproton beam and cooling takes place, and then to the collector in the terminal. The energy distribution function of the electron beam at the collector determines the required collector energy acceptance. Multiple and single intra-beam scatteringmore » as well as the dissipation of density micro-fluctuations during the beam transport are studied as factors forming a core and tails of the electron energy distribution. For parameters of the Fermilab electron cooler, the single intra-beam scattering (Touschek effect) is found to be of the most importance.« less
  • This paper reviews the transport of the 19-MeV, 700-kA, 25-ns Hermes-III electron beam in long gas cells filled with N{sub 2} gas spanning six decades in pressure from 10{sup 3} to {approximately}10{sup 3} Torr. We show through measurements and theoretical analyses that the beam has two windows of stable transport: a low-pressure window (between {approximately}1 and {approximately}100 mTorr) that is dominated by propagation in the semi-collisionless IFR (ion-focused regime), and a high-pressure window (between {approximately}1 and {approximately}100 Torr) that is dominated by propagation in the resistive CDR (collision-dominated regime). In the CDR, 79{plus_minus}1.5% of the beam energy is transported overmore » 11 m at 20 Torr. In the IFR, we show that intense radiation fields with controllable rise times and pulse widths can be generated on axis at a bremsstrahlung target. In summary, the measurements and analyses presented here provide a quantitative description of the Hermes-III beam transport over six decades in pressure.« less
  • Simulation of beam cooling usually requires performing certain integral transformations every time step or so, which is a significant burden on the CPU. Examples are the dispersion integrals (Hilbert transforms) in the stochastic cooling, wake fields and IBS integrals. An original method is suggested for fast and sufficiently accurate computation of the integrals. This method is applied for the dispersion integral. Some methodical aspects of the IBS analysis are discussed.
  • A high-energy electron cooling system is presently being developed to overcome emittance growth due to Intra-beam Scattering (IBS) in RHIC. A critical item for choosing appropriate parameters of the cooler is an accurate description of the IBS. The analytic models were verified vs dedicated IBS measurements. Analysis of the 2004 data with the Au ions showed very good agreement for the longitudinal growth rates but significant disagreement with exact IBS models for the transverse growth rates. Experimental measurements were improved for the 2005 run with the Cu ions. Here, we present comparison of the 2005 data with theoretical models.