Proposed electron halo detector system as one of the beam overlap diagnostic tools for the new RHIC electron lens

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An electron lens for head-on beam-beam compensation planned for RHIC requires precise overlap of the electron and proton beams which both can have down to 0.3 mm rms transverse radial widths along the 2m long interaction region. Here we describe a new diagnostic tool that is being considered to aid in the tuning and verification of this overlap. Some of ultra relativistic protons (100 or 250 GeV) colliding with low energy electrons (2 to 10 keV) will transfer sufficient transverse momentum to cause the electrons to spiral around the magnetic guiding field in a way that will make them detectable ... continued below

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Thieberger, P.; Alessi, J.; Beebe, E.; Chasman, C.; Fischer, W.; Gassner, D. et al. March 28, 2011.

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An electron lens for head-on beam-beam compensation planned for RHIC requires precise overlap of the electron and proton beams which both can have down to 0.3 mm rms transverse radial widths along the 2m long interaction region. Here we describe a new diagnostic tool that is being considered to aid in the tuning and verification of this overlap. Some of ultra relativistic protons (100 or 250 GeV) colliding with low energy electrons (2 to 10 keV) will transfer sufficient transverse momentum to cause the electrons to spiral around the magnetic guiding field in a way that will make them detectable outside of the main solenoid. Time-of-flight of the halo electron signals will provide position-sensitive information along the overlap region. Scattering cross sections are calculated and counting rate estimates are presented as function of electron energy and detector position.

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  • 2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401

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  • Report No.: BNL--94132-2011-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 1011454
  • Archival Resource Key: ark:/67531/metadc836067

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  • March 28, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 30, 2016, 3:10 p.m.

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Thieberger, P.; Alessi, J.; Beebe, E.; Chasman, C.; Fischer, W.; Gassner, D. et al. Proposed electron halo detector system as one of the beam overlap diagnostic tools for the new RHIC electron lens, article, March 28, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc836067/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.