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2005 HAPPEX Run Summary

2005 HAPPEX Run Summary. Kent Paschke HAPPEX Collaboration Meeting December 3, 2005. Run Summary. Helium. Scheduled: 48 days. July 9 – Aug 7 Aug 7 – Aug 31. Actual: 55 days. July 28 – Sept 1 Sept 9 – Sept 27. Late start due to installation

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2005 HAPPEX Run Summary

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  1. 2005 HAPPEX Run Summary Kent Paschke HAPPEX Collaboration Meeting December 3, 2005

  2. Run Summary Helium Scheduled: 48 days July 9 – Aug 7 Aug 7 – Aug 31 Actual: 55 days July 28 – Sept 1 Sept 9 – Sept 27 • Late start due to • installation • sweeper/septum and spectrometer commissioning • beamline commissioning ~18 day “parasitic” extension was very important Hydrogen Scheduled: 39 days Oct 15 – Nov 23 Actual: 36 days Oct 16 – Nov 21 Last day for PREx tests Kent Paschke HAPPEX Collaboration Meeting

  3. Run Summary Helium Scheduled:~800 hours Delivered: ~1000 hours Actual: Good pairs: ~34M ~630 hours (+ background studies, calibration, etc) Total Charge: 79.7 C P2Q*L ~ 35% (not counting 2004) Hydrogen Scheduled:~450 hours Delivered: ~580 hours Actual : Good pairs: ~24M ~440 hours (+ background studies, calibration, etc) Total Charge: 86.7 C P2Q*L ~ 59% (not counting 2004) Kent Paschke HAPPEX Collaboration Meeting

  4. Online Raw Asymmetry Helium Hydrogen Kent Paschke HAPPEX Collaboration Meeting

  5. Background Studies Helium • Al Background • ~1.8% • Integrating + Counting measurement • Inelastic spectra • Dipole scan for rescattering probability • Total: ~ 4 shifts? • Likely results: <2% He QE, ~1.8% Al, <0.6% rescatter Hydrogen • Al Background • ~0.7% • Integrating + Counting measurement • Inelastic spectra • Dipole scan for rescattering probability • Total: ~ 3 shifts? • Likely results: ~0.7% Al, <0.2% rescatter Kent Paschke HAPPEX Collaboration Meeting

  6. Transverse Asymmetry Helium • PV ~ 3%, AT ~ 13 ppm -> suggests 0.8 ppm difference • AL – AR is large (0.9 ppm) • Sign is correct! Hydrogen • PV < 2%, Aperp ~ 6.5 ppm • AL – AR is small Kent Paschke HAPPEX Collaboration Meeting

  7. Correlated Noise Helium AL–AR RMS = 1912 ppm “True” width ~ 956 ppm Average width ~ 1047 ppm Correlated noise ~ 430 ppm Double Difference suggests BCM noise <70 ppm Likely culprit: Density Fluctuations Hydrogen AL–AR RMS = 1066 ppm “True” width ~ 533 ppm Average width ~ 537 ppm Correlated noise ~ 65 ppm Double Difference suggests BCM noise ~ 56 ppm Kent Paschke HAPPEX Collaboration Meeting

  8. Polarimetry Results Helium Hydrogen Kent Paschke HAPPEX Collaboration Meeting

  9. Physics Asymmetry Helium 2004: APV: s ~ 0.21 ppm (3.5%) APV: s ~ 0.84 ppm (11.2%) GEs: s ~ 0.014 GEs: s ~ 0.042 Hydrogen 2004: APV: s ~ 0.24 ppm (17%) APV: s ~ 0.12 ppm (8%) GEs+0.080GMs:s ~ 0.025 GEs+0.084GMs: s ~ 0.012 NOTE: Statistical error only! Systematic error will likely increase Helium error bar by ~40%, and Hydrogen by about 25% Kent Paschke HAPPEX Collaboration Meeting

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