Moller Polarimeter/NPS
From PolWiki
Summary Plot of NPS Moller Measurements
Moller measurement summaries
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
October 17, 2023
- IHWP IN: P = -80.34 +/- 0.52 %
- IHWP OUT: P = 80.92 +/- 0.53 %
- Had HV troubles at beginning - had to load in backup from A1n. Found the scintillators had been set at very voltages. Finally saw good tune plot.
- Did another collimator scan
- 1/2 = -1.0/-1.0
- 3/4 = -2.4/-2.4
- 6/7 = -2.6/-2.4
- Summary log entry: https://logbooks.jlab.org/entry/4201825
- Runs on 10/17/2023 (QE = 0.2563%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1839 - - -48.3 - DAQ test 1840 - - -48.3 - Tune plot run 1841 -80.43 0.73 -48.3 10537.67 IHWP=IN 1842 -80.15 0.75 -48.3 10537.72 IHWP=IN 1843 -83.04 3.72 -48.3 10537.69 IHWP=IN, Helicity error 1844 81.64 0.75 -48.3 10537.84 IHWP=OUT 1845 80.20 0.75 -48.3 10537.74 IHWP=OUT 1846 81.78 2.17 -48.3 10537.70 IHWP=OUT
October 27, 2023
- IHWP IN: P = -80.58 +/- 0.53 %
- IHWP OUT: P = 80.71 +/- 0.58 %
- No scans or systematic checks - just measurement
- Summary log entry: https://logbooks.jlab.org/entry/4210159
- Runs on 10/27/2023 (QE = 0.2473%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1847 - - -48.3 - DAQ test 1848 - - -48.3 - Tune plot run 1849 80.27 0.76 -48.3 10537.80 IHWP=OUT 1850 81.21 0.81 -48.3 10537.63 IHWP=OUT 1851 -81.52 0.74 -48.3 10537.69 IHWP=IN 1852 -79.61 0.75 -48.3 10537.72 IHWP=IN 1853 - - -48.3 - Bleed thru: 0.5-3 Hz (4.6 kHz signal)
November 6, 2023
- IHWP IN: P = -78.53 +/- 0.55 %
- IHWP OUT: P = 78.45 +/- 55 %
- No scans or systematic checks - just measurement. New Wien angle!!
- Summary log entry: https://logbooks.jlab.org/entry/4216323
- Runs on 11/6/2023 (QE = 0.172%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1856 - - -15.3 - Tune plot run 1857 - - -15.3 - junk 1858 - - -15.3 - junk - beam needed to be resteered 1859 -79.37 0.80 -15.3 10539.66 IHWP=IN 1860 -77.80 0.75 -15.3 10539.62 IHWP=IN 1861 78.00 0.78 -15.3 10539.62 IHWP=OUT 1862 78.88 0.77 -15.3 10537.72 IHWP=OUT
November 18, 2023
- HWP=OUT: P=68.10 +/- 0.53 %
- IHWP=IN: P=-68.27 +/- 0.52 %
- First measurement at 4 pass. Cathode heat and reactivation a few days before.
- New HV and collimator settings.
- Summary log entries: https://logbooks.jlab.org/entry/4222344, https://logbooks.jlab.org/entry/4222318
- Runs on 11/18/2023 (QE = 0.2956%.)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1863 - - -30.0 - Tune run: Q3=910 A 1864 - - -30.0 - Tune run: Q3=920 A 1865 - - -30.0 - Tune run: Q3=915 A 1866 - - -30.0 - Tune run: Q3=910 A 1867 - - -30.0 - Helicity errors, junk 1869 - - -30.0 - Helicity errors, junk 1869 - - -30.0 - Helicity errors, junk 1870 68.22 0.75 -30.0 8457.27 IHWP=OUT 1871 67.96 0.76 -30.0 8456.97 IHWP=OUT 1872 -67.83 0.76 -30.0 8458.16 IHWP=IN 1873 -68.65 0.71 -30.0 8456.35 IHWP=IN
December 6, 2023
- HWP=IN: P=-86.23 +/- 0.50 %
- IHWP=OUT: P=-86.68 +/- 0.51 %
- Cathode has been replaced since last measurement
- New Wien angle
- Summary log entries:
- Runs on 12/6/2023 (QE = 0.6256%.)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1877 - - -50.0 - Tune run 1878 -85.35 0.68 -50.0 8453.81 IHWP=IN 1879 -87.24 0.73 -50.0 8454.24 IHWP=IN 1880 86.29 0.71 -50.0 8454.54 IHWP=OUT 1881 87.09 0.72 -50.0 8453.86 IHWP=OUT
