First polarized proton collision at a beam energy of 250 GeV in RHIC

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After providing collisions of polarized protons at a beam energy of 100 GeV since 2001, the Relativistic Heavy Ion Collider (RHIC) at BNL had its first opportunity to collide polarized protons at its maximum beam energy of 250 GeV in the 2009 polarized proton operations. Equipped with two full Siberian snakes [1] in each ring, RHIC preserves polarization during acceleration from injection to 100 GeV with precise control of the betatron tunes and vertical orbit distortions. However, the strong intrinsic spin resonances beyond 100 GeV are more than two times stronger than those below 100 GeV, requiring much tighter tolerances ... continued below

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Bai,M.; Ahrens, L.; Alekseev, I. G.; Alessi, J. & al., et May 4, 2009.

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After providing collisions of polarized protons at a beam energy of 100 GeV since 2001, the Relativistic Heavy Ion Collider (RHIC) at BNL had its first opportunity to collide polarized protons at its maximum beam energy of 250 GeV in the 2009 polarized proton operations. Equipped with two full Siberian snakes [1] in each ring, RHIC preserves polarization during acceleration from injection to 100 GeV with precise control of the betatron tunes and vertical orbit distortions. However, the strong intrinsic spin resonances beyond 100 GeV are more than two times stronger than those below 100 GeV, requiring much tighter tolerances on vertical orbit distortions and betatron tunes. With the currently achieved orbit correction and tune control, average polarizations of {approx_equal} 42% at top energy and average polarizations of {approx_equal} 55% at injection energy were achieved. Polarization measurements as a function of beam energy also indicated aU polarization losses occurred around three strong intrinsic resonances at 136 GeV, 199.3 GeV and 220.8 GeV Peak luminosity of 122 x 10{sup 30} cm{sup -2} s{sup -1} was also demonstrated. This paper presents the performance of the first RHIC 250 GeV operation and discusses the depolarization issues encountered during the run.

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  • Particle Accelerator Conference; Vancouver, B.C., Canada; 20090504 through 20090508

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  • Report No.: BNL--81791-2009-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 952523
  • Archival Resource Key: ark:/67531/metadc933157

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

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  • May 4, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 8:33 p.m.

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Bai,M.; Ahrens, L.; Alekseev, I. G.; Alessi, J. & al., et. First polarized proton collision at a beam energy of 250 GeV in RHIC, article, May 4, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc933157/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.