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LHRS Optics Calibration Straight-through, good septum

LHRS Optics Calibration Straight-through, good septum. Min Huang 10 /23/2012. Straight-thru Optics. Settings Beam energy 2.253GeV 0T target field at 6 deg, Gep target magnet config Good septum Optics runs Full delta scan on both arms (-3%, -2%, 0, 2%, 3%). Straight-thru Optics.

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LHRS Optics Calibration Straight-through, good septum

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  1. LHRS Optics CalibrationStraight-through, goodseptum Min Huang 10/23/2012

  2. Straight-thru Optics • Settings • Beam energy 2.253GeV • 0T target field at 6 deg, Gep target magnet config • Good septum • Optics runs • Full delta scan on both arms (-3%, -2%, 0, 2%, 3%)

  3. Straight-thru Optics • Used Tg_y instead of VertexZ • The previous problem perhaps comes from other material contamination, tried to select only carbon (elastic) events

  4. Steps Tried Dp vs. tg_y Dp vs. tg_th And a few other focal plane plots…

  5. Matrix Calibration • Jin suggested look at these plots with part of the acceptance, since it’s a multi-dimension problem • Cut each hole, and looked at dp vs. target phi/y/theta plots • Then decided to use dp vs. target theta

  6. Steps of cuts Tg_y vs. Tg_phvetex cut for the whole run Cut on each hole These two are from #3181 dp=-3%

  7. Steps of cut 3. Cut carbon elastic for each hole These two are from #3181 dp=-3%

  8. Matrix Angle Calibration

  9. Matrix Dp calibration

  10. Next • Any suggestions from this meeting • Looks good enough to me, a good base for more realistic situations later

  11. Backup Focal plane x vs. y

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