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Polarimeter in APEX Session

This presentation discusses the operational details and results from the polarimeter used in the APEX session at RHIC. Over 1.5 hours of data collection was performed, focusing on studying the rate dependence of polarization with various target sizes. A total intensity of 109*109 with 0.5*10^11 was utilized in both the blue and yellow rings. Despite limited variation in target sizes, significant insights were gained regarding event rates, indicating an increase to 6-8 MHz at 250 GeV. Ongoing analysis aims to implement a compensation scheme to address the observed rate problems.

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Polarimeter in APEX Session

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  1. Haixin Huang Mar. 27, 2009 Polarimeter in APEX Session

  2. RHIC CNI Polarimeter APEX • We used about 1.5 hours if excluding the first failed store. • The idea is to fill RHIC with lower bunch intensity, and use different target sizes to study the rate dependence (instantaneous rate). • 109*109 of 0.5*10^11 intensity in both blue and yellow. • Eight blue targets were used in blue and seven yellow targets were used in yellow. Unfortunately, there are not big variation in the target size in yellow. The yellow study is focused on testing the new Si detectors (with a separated DAQ system put in on last maintenance day). • The results show that the rate problem show up with rate between4 to 5MHz. • The analysis of these data is underway to get a compensation scheme in place.

  3. Polarization vs Event Rate (Targets)

  4. Comment on Rate • The rate in run6 was 1MHz at 100GeV with 111*1.5*10^11, emittance around 15 pi (quote the small IPM emittance measurement). • The rate in run8 was 3.2MHz at 100GeV with 109*1.7*10^11, emittance around 15-20pi. • This year the rate is 6-8MHz for 109*10^11 at 250GeV. • Sqrt (250/100)*sqrt(20pi/7pi)/1.7~5.1MHz. The rate is higher than this estimate even with the aggressive assumption of emittance reduction. We need to look for the source of the rate increase.

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