Moller Polarimeter/NPS

Moller measurements for NPS

Note that this is the first experiment to use the new cryogen-free superconducting target magnet.

===Summary Plot of NPS Moller Measurements

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 8, 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