Difference between revisions of "Moller Polarimeter/NPS"
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1800 - - -48.3 - Delay=2 | 1800 - - -48.3 - Delay=2 | ||
1801 - - -48.3 - Delay=4, 4 um target | 1801 - - -48.3 - Delay=4, 4 um target | ||
| − | 1802 - - -48.3 - changed prescale | + | 1802 - - -48.3 - changed prescale, before collimator scan |
1803 -79.93 0.77 -48.3 10539.04 IHWP=IN | 1803 -79.93 0.77 -48.3 10539.04 IHWP=IN | ||
1804 -80.18 0.77 -48.3 10538.97 IHWP=IN | 1804 -80.18 0.77 -48.3 10538.97 IHWP=IN | ||
Revision as of 17:06, 9 October 2023
Moller measurement summaries for NPS
Note on sign of polarization [1]
Note that this is the first experiment to use the new cryogen-free superconducting target magnet.
September 22, 2023
- IHWP IN: P = -80.06 +/- 0.54 %
- IHWP OUT: P = 80.55 +/- 0.58 %
- Tune up at 5 pass. Had a hard time seeing scintillators - thought they were gain matched ok (but maybe they weren't), so thought there might be problems with DAQ.
- Q1 = 126.86 A
- Q2/Q3 = -1318.0 A
- Final collimator settings: https://logbooks.jlab.org/entry/4185462, NOTE: these are wrong - chose wrong collimator 3 setting!
- 1/2 = -0.60/-0.60
- 3/4 = -1.80/-2.40
- 5=0.0
- 6/7=-2.90/-2.80
- Summary log entry: https://logbooks.jlab.org/entry/4185474
- Runs on 9/22/2023 (QE=0.3215%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1787 - - -48.3 - First run after gain matching calorimeters, 1 um foil 1788 - - -48.3 - Changed ADC/TDC prescale 1789 - - -48.3 - All scintillators turned on 1790 - - -48.3 - Q3 reduced from 1338 to 1318 A 1791 - - -48.3 - Changed memory delay from 4->3 1792 - - -48.3 - Changed memory delay from 3->5 1793 - - -48.3 - junk 1794 - - -48.3 - After rebooting all 1795 - - -48.3 - Added delay to memory strobe (16 ns, 8 ns) 1796 - - -48.3 - Changed defaults in CRL 1797 - - -48.3 - Set memory delay to 7 (WSI was unplugged - woops) 1798 - - -48.3 - Delay=7 1799 - - -48.3 - Delay=3 1800 - - -48.3 - Delay=2 1801 - - -48.3 - Delay=4, 4 um target 1802 - - -48.3 - changed prescale, before collimator scan 1803 -79.93 0.77 -48.3 10539.04 IHWP=IN 1804 -80.18 0.77 -48.3 10538.97 IHWP=IN 1805 80.18 0.82 -48.3 10538.83 IHWP=OUT 1806 78.62 2.84 -48.3 10539.53 IHWP=OUT 1807 81.13 0.86 -48.3 10539.14 IHWP=OUT
October 8, 2023
- IHWP IN: P = -81.03 +/- 0.54 %
- IHWP OUT: P = 81.21 +/- 0.57 %
- Attempted to improve gain matching scintillators. Performed short Q2/Q3 scan (rates). Accidentally used wrong collimator positions:
- 1/2=-1.7 cm
- 3/4=-2.5 cm
- 7/8=-2.4 cm
- Summary log entry: https://logbooks.jlab.org/entry/4195556
- Runs on 10/8/2023 (QE=0.2791%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1823 - - -48.3 - DAQ test 1824 - - -48.3 - Gain matched Left-5 triggered on coins, then used scin trigger for others 1825 - - -48.3 - Increased all scintillator HV 50 V - looks a little better 1826 - - -48.3 - Increased L4 and L9 even more. 1st point of Q3 (=1318 A)scan (4.7 kHz/uA) 1827 - - -48.3 - Q3 scan: 1298 A (4.7 kHz/uA) 1828 - - -48.3 - Q3 scan: 1278 A (4.5 kHz/uA) 1829 - - -48.3 - Q3 scan: 1338 A (4.5 kHz/uA) 1830 - - -48.3 - Q3 scan: 1318 A (4.7 kHz/uA) 1831 -81.33 0.77 -48.3 10538.73 IHWP=IN 1832 -80.73 0.77 -48.3 10538.69 IHWP=IN 1833 - - -48.3 - IHWP=OUT (junk - Hall A performing NMR) 1834 81.53 1.51 -48.3 10538.66 IHWP=OUT helicity error - only got part of run 1835 81.25 0.78 -48.3 10538.71 IHWP=OUT 1836 81.00 1.00 -48.3 10538.71 IHWP=OUT 1837 - - -48.3 - Bleed-thru run (laser off) coin rate=1 Hz
