Magnetic field measurement and compensation in the Recycler Electron Cooler

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Cooling of 8.9-GeV/c antiprotons in the Recycler Electron Cooler requires a round 4.34-MeV electron beam with a small angular spread propagating through a 20-m long cooling section. To confine the electron beam tightly and to keep its total transverse angles below 0.2 mrad the cooling section is immersed in a solenoidal field of 50-200 G. The field was measured with a compass-based sensor (transversal) and a hall-probe (longitudinal) after installation of the solenoids into the Recycler tunnel. For the field strength of 105 G, the transverse field components were compensated to the level that provided corresponding dipole beam oscillations below ... continued below

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5 pages

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Tupikov, V.; /Fermilab; Kazakevich, Grigory M.; /Novosibirsk, IYF; Kroc, T.K.; Nagaitsev, S. et al. September 1, 2005.

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Cooling of 8.9-GeV/c antiprotons in the Recycler Electron Cooler requires a round 4.34-MeV electron beam with a small angular spread propagating through a 20-m long cooling section. To confine the electron beam tightly and to keep its total transverse angles below 0.2 mrad the cooling section is immersed in a solenoidal field of 50-200 G. The field was measured with a compass-based sensor (transversal) and a hall-probe (longitudinal) after installation of the solenoids into the Recycler tunnel. For the field strength of 105 G, the transverse field components were compensated to the level that provided corresponding dipole beam oscillations below 0.1 mrad, which in turn allowed the first cooling of antiprotons in the GeV energy range. This paper discusses the field measurements and compensation scheme including the results of dipole oscillation measurements.

Physical Description

5 pages

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  • Journal Name: AIP Conf.Proc.821:375-379,2006; Conference: Presented at International Workshop on Beam Cooling and Related Topics (COOL05), Eagle Ridge, Galena, IL, USA, 18 - 23 Sep 2005

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  • Report No.: FERMILAB-CONF-05-397-AD
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 875515
  • Archival Resource Key: ark:/67531/metadc875624

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  • September 1, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 4:48 p.m.

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Tupikov, V.; /Fermilab; Kazakevich, Grigory M.; /Novosibirsk, IYF; Kroc, T.K.; Nagaitsev, S. et al. Magnetic field measurement and compensation in the Recycler Electron Cooler, article, September 1, 2005; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc875624/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.