Stability of electron energy in the Fermilab electron cooler

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A powerful electron beam (4.3 MeV, 0.1 A DC) generated by an electrostatic accelerator has been used at Fermilab for three years to cool antiprotons in the Recycler ring. For electron cooling to be effective, the electron energy should not deviate from its optimum value by more than 500V. The main tool for studying the energy stability is the electron beam position in a high-dispersion area. The energy ripple (frequencies above 0.2 Hz) was found to be less than 150 eV rms; the main cause of the ripple is the fluctuations of the chain current. In addition, the energy can ... continued below

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30 pages

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Shemyakin, A.; Carlson, K.; Prost, L.R.; Saewert, G. & /Fermilab February 1, 2009.

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A powerful electron beam (4.3 MeV, 0.1 A DC) generated by an electrostatic accelerator has been used at Fermilab for three years to cool antiprotons in the Recycler ring. For electron cooling to be effective, the electron energy should not deviate from its optimum value by more than 500V. The main tool for studying the energy stability is the electron beam position in a high-dispersion area. The energy ripple (frequencies above 0.2 Hz) was found to be less than 150 eV rms; the main cause of the ripple is the fluctuations of the chain current. In addition, the energy can drift to up to several keV that is traced to two main sources. One of them is a drift of the charging current, and another is a temperature dependence of generating voltmeter readings. The paper describes the efforts to reach the required level of stability as well as the setup, diagnostics, results of measurements, and operational experience.

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30 pages

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  • Presented at 42nd Symposium of Northeastern Accelerator Personnel (SNEAP), Ann Arbor, Michigan , 12-17 Oct 2008

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  • Report No.: FERMILAB-CONF-08-425-AD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 948877
  • Archival Resource Key: ark:/67531/metadc934767

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 1, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 2, 2016, 12:31 p.m.

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Shemyakin, A.; Carlson, K.; Prost, L.R.; Saewert, G. & /Fermilab. Stability of electron energy in the Fermilab electron cooler, article, February 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc934767/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.