1 / 9

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

nalani
Télécharger la présentation

2005 HAPPEX Run Summary

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related