Luminosity issues in 2009 100 GeV polarized proton run

Zhang, S.Y.

doi:10.2172/970518

Cited by 1 publication

(4 citation statements)

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“…With more Booster scraping, the RHIC emittance tends to be smaller. This has been observed in RHIC proton runs, say, 2006, 2009, 2011, and 2012 [1][2][3][4].…”

Section: Rhic Transverse Emittance Improvementmentioning

confidence: 79%

“…Despite many factors between the Booster to RHIC store, for example, the Booster to AGS transfer (BtA), the AGS ramping, the AGS to RHIC transfer (AtR), and the RHIC ramping and β squeezing, striking correlations of the Booster scraping ratio and RHIC polarization has been presented in 100 GeV polarized proton runs 2006,2008,2009 [1][2][3][4]. This correlation is similarly presented in 250/255 GeV runs.…”

Section: Rhic Polarization Improvementmentioning

confidence: 99%

“…In [1][2][3][4], detailed study of the Booster scraping effect on RHIC polarization is presented for 100 GeV polarized proton run 2006, 2008, and 2009. In the successful run 2006, the Booster input intensity is raised to > 5 × 10 11 , allowing high Booster scraping ratio, up to 2.8.…”

Section: Rhic Polarization Improvementmentioning

confidence: 99%

“…In run 2006, the tank 9 pulse width was extended to 400 µs, which allowed the Booster input intensity to be as high as > 5 × 10 11 , and the Booster scraping ratio better than 16 2.5. As the result, even with the increase of RHIC bunch intensity, > 1.5 × 10 11 , the polarization at RHIC injection is improved up to 65%, as shown in [1][2][3][4].…”

Section: Key Factor For Rhic Improvementmentioning

confidence: 99%

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RHIC Proton Luminosity and Polarization Improvement

Zhang

2014

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The RHIC proton beam polarization can be improved by raising the Booster scraping, which also helps to reduce the RHIC transverse emittance, and therefore to improve the luminosity. By doing this, the beam-beam effect would be enhanced. Currently, the RHIC working point is constrained between 2/3 and 7/10, the 2/3 resonance would affect intensity and luminosity lifetime, and the working point close to 7/10 would enhance polarization decay in store. Run 2013 shows that average polarization decay is merely 1.8% in 8 hours, and most fills have the luminosity lifetime better than 14 hours, which is not a problem. Therefore, even without beambeam correction, there is room to improve for RHIC polarization and luminosity. The key to push the Booster scraping is to raise the Booster input intensity, for that two approaches can be used. The first is to extend the LINAC tank 9 pulse width, which has been successfully applied in run 2006. The second is to raise the source temperature, which has been successfully applied in run 2006 and run 2012.

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“…With more Booster scraping, the RHIC emittance tends to be smaller. This has been observed in RHIC proton runs, say, 2006, 2009, 2011, and 2012 [1][2][3][4].…”

Section: Rhic Transverse Emittance Improvementmentioning

confidence: 79%