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H-Jet polarimeter status report

H-Jet polarimeter status report. Yousef Makdisi RSC 07/28/06. Jet operations in `06. Igor and Dima provided the new code to readout the full waveform and monitoring program. Ron provided the daily PC technical support and monitoring.

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H-Jet polarimeter status report

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  1. H-Jet polarimeter status report Yousef Makdisi RSC 07/28/06

  2. Jet operations in `06 • Igor and Dima provided the new code to readout the full waveform and monitoring program. • Ron provided the daily PC technical support and monitoring. • Anatoli and Yousef, the daily jet oversight and maintenance (a long haul but only 3 midnight calls) • T. Wise came to the rescue of the SFT unit. • MCR Operations took full responsibility and saw to it that data were collected in each fill.

  3. Waveforms(new H-Jet data format this year) Fit Half maximum Baseline = 8

  4. Overall Picture and Cuts

  5. Snap shot of online Monitoring

  6. Strips after the loss of detector 3

  7. Energy Distributions

  8. Click on Info

  9. Data Collected @ 100 GeV Fills Dates Beam Events 7630-7652 3/18-25 B 2.5M 7662-7697 3/26-4/4 Y 2.8M 7718-7745 4/4-11 B 1.6M 4/11 Lost Si detector # 3 7780-7802 4/12-5/2 Y 3.8M 7810-7858 5/3-15 B 4.2M 7887-7946 5/19-6/1 Y 2.5M 6/2 Si detector acted up: reduced the bias from 200 – 175 V. 7949-8002 6/3-5 B 2.0M

  10. Data Collected at 31.2 GeV Fills Dates Beam Events 8005-8054 6/9-17 B 3.6M 8055-8061 6/18-20 Y 2.6M

  11. Data Analysis • The `05 data is being analyzed by Oleg. • Hiromi will complete the 24 GeV analysis for data taken in `04. This represents the first look at injection albeit with low statistics. • The 31.2 GeV data provides a good statistical sample taken in conjunction with the polarimeters. It is closest to calibration at injection. (No one??) • The 100 GeV `06 is waiting for a good volunteer. • The change in the DAQ to readout the full WFD waveform (Dima) does not allow the use of the old analysis programs. • Igor wrote the online analysis and monitoring program which could be used as a first step.

  12. Raw asymmetries

  13. Beam polarization

  14. Comparison with pC-polarimeters

  15. Operational issues • Nozzle blockage frequency: every 10-12 days. It takes 3 hours to warm up, ½ hour beam down, and two hours to cool down and back online. • Slower intensity ramp up than before. 3-4 days to reach full intensity, plateau for a few days and then a slow decrease to blockage. • Midway replaced the nozzle which improved matters somewhat. • The SFT phase became unstable for a period. Fixed by T. Wise by increasing the gain. • Lost some precious time due to memory full condition. • Lost one silicon detector, and another acted up.

  16. Operations continued • Failed to take data with two beams at the same time: • Requirement that the two beams be separated by 4-6 mm. • The vertical collimation occluded the silicon acceptance. • Determined no polarization loss with 112 bunch operation and 1.1011 p/bunch implying the holding field uniformity is adequate. • Installed a CCD camera to look at light emitted as the beam hits the jet. This serves as another vertical beam emittance device. Our interest is to measure the molecular hydrogen contamination. • No pump failure this run.

  17. What is next? • Determine the cause of the silicon failure. • Replace the failed detectors with existing spares. • Start discussion with Hamamatsu to purchase new detectors. • Purchase spare WFD components. • Will attempt to open up the vertical collimation to allow simultaneous two-beam measurement. • Wisconsin is building two RF cavities to allow a polarized deuteron jet beam. • Attempt to improve the jet vacuum to keep it on the beam line during Au-Au running.

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