Moller Polarimeter/NPS
From PolWiki
Summary Plot of NPS Moller Measurements
Global fit to Hall A, B, C Moller Measurements + Mott Measurement
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
- IHWP=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: https://logbooks.jlab.org/entry/4230642
- 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
December 13, 2023
- IHWP=IN: N/A
- IHWP=OUT: P= 87.53 +/- 0.51 %
- IHWP=OUT measurement only
- Runs on 12/13/2023 (QE = 0.4653%.)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1883 - - -50.0 - Tune run 1884 87.00 0.73 -50.0 8453.36 IHWP=OUT 1885 88.04 0.72 -50.0 8454.49 IHWP=OUT
January 22, 2024
- IHWP=IN: P=-77.99 +/- 0.44 %
- IHWP=OUT: P= 78.49 +/- 0.44 %
- Beam energy drifted about 4 MeV during Moller running from production value
- Runs on 1/22/2023 (QE = 1.0025%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1887 - - -13.2 - Tune run 1888 79.99 0.77 -13.2 10539.65 IHWP=OUT 1889 77.57 0.68 -13.2 10539.97 IHWP=OUT 1890 78.52 1.09 -13.2 10540.36 IHWP=OUT, noticed 2nd scaler bank wasn't counting, reset crate 1891 77.56 1.31 -13.2 10540.27 IHWP=OUT 1892 -78.42 0.71 -13.2 10540.18 IHWP=IN 1893 -78.33 0.71 -13.2 10541.54 IHWP=IN 1894 - - -13.2 - Junk 1895 -76.68 0.93 -13.2 10541.72 IHWP=IN 1896 - - -13.2 - Bleedthru check - none
February 2, 2024
- IHWP=IN: P= -80.96 +/- 0.50 %
- IHWP=OUT: P= 80.98 +/- 0.48%
- Used SLM energy lock
- Runs on 2/2/2024 (QE = 0.9734%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1898 - - -13.2 - Tune run 1899 -81.40 0.68 -13.2 10536.76 IHWP=IN 1900 -82.35 1.47 -13.2 10536.08 IHWP=IN, energy lock was off 1901 - - -13.2 - Junk 1902 -81.69 1.35 -13.2 10536.59 IHWP=IN, end for steering 1903 -79.92 0.87 -13.2 10536.64 IHWP=IN 1904 81.49 0.69 -13.2 10536.31 IHWP=OUT 1905 - - -13.2 - Junk (helicity panic) 1906 80.50 0.67 -13.2 10536.49 IHWP=OUT
February 15, 2024
- IHWP=IN: P= -81.68 +/- 0.59%
- IHWP=OUT: P= 82.19 +/- 0.54%
- Runs on 2/15/2024 (QE = 0.9617%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1908 - - -47.6 - DAQ test 1909 - - -47.6 - Tune run 1910 82.26 0.75 -47.6 10538.88 IHWP=OUT 1911 - - -47.6 - Short run - energy drifting 1912 82.12 0.78 -47.6 10540.01 IHWP=OUT 1913 -81.84 0.90 -47.6 10538.94 IHWP=IN 1914 -81.57 0.77 -47.6 10539.70 IHWP=IN
March 5, 2024
- IHWP=IN: P=-79.79 +/- 0.55%
- IHWP=OUT: P=80.44 +/- 0.54%
- Runs on 3/5/2024 (QE = 0.9143%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1915 - - -47.6 - DAQ test 1916 - - -47.6 - Tune run 1917 -79.42 0.77 -47.6 10536.48 IHWP=IN 1918 -80.16 0.78 -47.6 10536.46 IHWP=IN 1919 80.46 0.77 -47.6 10536.69 IHWP=OUT 1920 80.42 0.75 -47.6 10536.51 IHWP=OUT
March 12, 2024
- IHWP=IN: P=-84.05 +/- 0.41%
- IHWP=OUT: P=84.29 +/- 0.41%
- First measurement at 3 pass
- Runs on 3/12/2024 (QE = 0.8473%)
Run Pol (%) Error (%) Hwien HALC:p(MeV) Comment 1921 - - -47.6 - DAQ test 1922 - - -47.6 - Tune run 1923 83.42 0.66 10.0 6368.68 IHWP=OUT 1924 83.87 0.71 10.0 6368.63 IHWP=OUT 1925 85.74 0.73 10.0 6368.54 IHWP=OUT 1926 -82.83 0.69 10.0 6368.51 IHWP=IN 1927 -85.42 0.72 10.0 6368.50 IHWP=IN 1928 -84.00 0.72 10.0 6368.51 IHWP=IN
