1 / 11

Møller Polarimeter Status Update

Møller Polarimeter Status Update. Møller hardware status (detectors and targets) Systematics for SANE Plan Dave Gaskell SANE Collaboration Meeting May 30, 2008. Hall C Møller Polarimeter. Superconducting solenoid  Brute force out of plane magnetization. Scintillators  set “tune”

kermit
Télécharger la présentation

Møller Polarimeter Status Update

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. Møller Polarimeter Status Update Møller hardware status (detectors and targets) Systematics for SANE Plan Dave Gaskell SANE Collaboration Meeting May 30, 2008

  2. Hall C Møller Polarimeter Superconducting solenoid  Brute force out of plane magnetization Scintillators  set “tune” Calorimeter  measurement

  3. Detectors Scintillators refurbished before G0 Back angle  Additional repairs before GEp One dead scintillator on left arm appeared during GEp

  4. GEp Configuration Kicker test target 4 mm foil 1 mm foil Not accessible Targets Present target configuration optimized for “high current” running  1-2 mA At 100 nA, dP/P=1% (stats) would take 2.4 hours on 4 mm target (5.9 GeV) SANE Replace 1 mm foil with 10 mm foil Replace “not accessible” with 20 mm foil and make accessible with new actuator

  5. Systematics: G0 Forward Angle Systematic error budget from G0 Forward Angle expt. dP/P = 1.32%

  6. Systematics: SANE • No “high current extrapolation” • Leakage more important dP/P < 1.5%?

  7. Systematics: SANE It is unlikely Wien will be set for maximum polarization to Hall C during SANE At 5 pass and high energy (5.9 GeV) small changes in the beam energy can impact the polarization in the Hall Example: Wien set for 80% of maximum in Hall C at 5.9 GeV  1 MeV shift in beam energy gives 2.3% change in polarization in Hall SANE? Optimum

  8. Hall C Møller during GEp Some hint of dependence of polarization on QE!

  9. Collimator Issues General philosophy: Let collimators in front of detectors determine acceptance Collimators between Q1 and Q2 “clean up” backgrounds  do not impact acceptance

  10. Collimator Issues At 5.9 GeV, collimators between Q1/Q2 come close to impinging on acceptance Collimators 6&7 can collide – may cause reproducibility problems

  11. Møller Measurement Plan Measurements desired every 2-3 days Two options: • RSS-style general procedure that anyone on shift can follow • Can make measurements anytime – whenever convenient • Results may be a little less reliable • G0 Forward-style: “small” group makes all measurements (“small”= at least 5-6 people)  Measurements need to be scheduled  More reliable polarization measurements  smaller systematic errors

More Related