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RHIC pC Setup Meeting Summary - January 21, 2011

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This document summarizes the RSC meeting held on January 21, 2011, focusing on the RHIC pC setup and polarimeter status. Key discussions included the successful resolution of readout issues with the yellow-1 downstream polarimeter and updates on current monitoring for Y2U. The meeting also covered upcoming plans for the shutdown, including the installation of a second source and additional foils. Polarization measurements were presented, indicating progress in understanding the energy scale corrections. A checklist for future tasks was outlined.

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RHIC pC Setup Meeting Summary - January 21, 2011

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  1. RSC-Meeting, January 21st 2011

  2. RHIC pC Setup Run11 RSC-Meeting, January 21st 2011

  3. Polarimeter Status 111 bunch injection studies • Work during access on Wednesday: • fixed problem with readout of yellow-1-downstream polarimeter • investigated problem with current monitoring of Y2U • spares of modules involved located • can hopefully fix the problem at the next access day Hardware status okay • Change in operational procedure: • turn off Si bias voltage during beam studies, tune-up, APEX • keep radiation damage at a minimum RSC-Meeting, January 21st 2011

  4. First Data from B1 & B2 Polarimeters Blue-1 Upstream • Raw Data: • bananas clearly visible • calibration ADC -> energy • alpha calibrations • need to correct for Si – dead layer Blue-2 Downstream RSC-Meeting, January 21st 2011

  5. a-Calibration Blue-1 Upstream factor 2 in position comes from the fact that downstream polarimeters don’t use shapers, which also amplify Remember a’s penetrate much deeper into Si than carbons • Plan for upcoming shutdown: • install 2nd source with different • - energy • install different foils to attenuate • a – energy (tests in lab planned) Blue-2 Downstream RSC-Meeting, January 21st 2011

  6. Data after Corrections t0 Blue-1 Upstream Blue-1 Upstream energy-scale correction based on Si dead layer Energy-Scale Blue-2 Downstream Blue-2 Downstream Current Puzzle: difference between t0 and energy scale correction factor RSC-Meeting, January 21st 2011

  7. Data after all Corrections Blue-1 Upstream After all corrections both polarimeters look very similar Are you ready ???? Fasten your seat belts the secret will be revealed Blue-2 Downstream RSC-Meeting, January 21st 2011

  8. Polarization at Injection for Blue Ring 14807.003: blue1 upstream P = 51 +/- 3 % (stat only) 14807.212: blue2 downstream P = 49 +/- 3 % (stat only) RSC-Meeting, January 21st 2011

  9. To Do • Update parameters in online polarization calculation to get reasonable numbers • Investigate the difference in energy-scale constant between B1 and B2 • see we get the same result for Y1 and Y2 (just collected the data last night) • measure linearity of energy response of different systems • vary pulser amplitude  latest during the next access day • Need good data for Y1 and Y2 polarimeters to determine parameters for online, most likely the ones from last night will do. • Analyze the polarization at flat top for B2 • Next access-day • fix bias voltage readout • bring hopefully one detector back to live in Y2U by changing pre-amp box RSC-Meeting, January 21st 2011

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