Moller Polarimeter/NPS

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
    • 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
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=IN
1806      78.62     2.84        -48.3     10539.53        IHWP=IN
1807      81.13     0.86        -48.3     10539.14        IHWP=IN

October 8, 2023

• IHWP IN: P = -81.03 +/- 0.54 %
• IHWP OUT: P = 81.21 +/- 0.57 %

• Attempted to improve gain matching scintillators. 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