RunPlan

PREX Run Plan for   Commissioning   and   Auxiliary Measurements

Updated: Jan 25, 2010

See also the Daily Run Plan

This doesn't include regular Production running. The experiment is approved for 30 PAC days; there are 2 weeks of "commissioning" listed, and then an additional 61 days for production.

Below is a list of tasks in the approximate time order, with person(s) responsible, approximate amount of time required, and comments about the conditions or needs. The time will, in most cases, be broken up into manageable chunks. For example, the GEM commissioning will occur in about 4 periods of time, each 4 hours, separated by at least one day.

• Basic Beam Setup -- 2 shifts   Jay Benesch, Bteam
  
• Source and Parity Quality Beam -- 3 shifts   Kent Paschke, Mark Dalton, Rupesh Silwal
  
• Low-current cavities -- 1 shift (day)   John Musson, Zafar Ahmed
  • Need before Optics and Q²
  • Should be on Day shift
• Septum Commissioning -- 1 shift   Bob Michaels, John LeRose
  • Verify septum does not steer beam
  • Thin target, low-current checks
• Main Detectors -- 3 shifts   Krishna Kumar, et.al.
  • Detector alignment -- Dustin McNulty
  • Pulse-height spectra and resolution
• GEM Detectors -- 2 shifts   Ole Hansen, et.al.
• Check A_T hole and detector -- 2 shifts   Bob Michaels
  • Needs to be done before high-current - radiation issue
  • Successive accesses to block and unblock the A_T hole
• Water Cell and Optics of HRS+Septum -- 2 shifts   Nilanga Liyanage
  • Sieve Slit runs
  • Angle calibration
  • Access to remove water cell; then cool the target -- Dave Meekins
• Double-Wien Spin Manipulator Commissioning -- 3 shifts   Joe Grames
• Compton Commissioning -- 8 shifts   Sirish Nanda, et.al.
  • Beam Tune, Background reduction -- Bteam, Alexandre Camsonne
  • Compton Cavity Checkout -- Sirish et.al.
  • Photon Detector Checkout -- CMU group
  • Electron Detector Checkout -- Alexandre Camsonne
• Moller Commissioning -- 8 shifts   Sasha Glamazdin, et.al.
  • Magnet Alignment -- 1 shift (swing)
  • Raster size and pulse-mode -- 1 shift (day)
  • Target commissioning - 3 shifts
  • Pulse-mode target commissioning - 2 shifts
  • DAQ checkout -- 1 shift
• Lead Target Commissioning -- 1 shift
  • Establish 100 uA on Lead/Diamond target
  • Measure radiation, establish luminosity limits
• Optimize helicity flip rate -- 1 shifts
  • Lumi and oversampling studies
  • 30, 120, and 240 Hz checkout
• Bulls-eye scan -- 1 shift
• Fixed-Gain BPM Calibration -- 1 shift
• BCM Calibration -- 1 shift   Diancheng Wang, Xioayan Deng
• Checkout of (New) Beam Modulation -- 2 shifts   Rupesh Silwal, Kent Paschke
• Commission Charge Asymmetry Feedback -- 4 hours   Luis Mercado, Rupesh Silwal
• ARC Energy Measurement -- 4 hours
• Q² Measurement -- 1 shift   Dustin McNulty
  • Low-current, using GEMs and/or VDCs
  • To be repeated periodically during experiment.
• Linearity Studies -- 1 shift   Rupesh Silwal, Kent Paschke
• Transverse Asymmetry -- 3 shifts
  • Spin Dance -- 1 shift
  • Running with deliberately transverse polarization -- 2 shifts
• Background Studies -- 2 shifts
  • Scans of Septum Magnet and HRS Dipole
  • Thin Lead Target to check for inelastics at high-resolution
  • Thin C12 to measure diamond background

Total time: approx 17 days !   Based on this list, each day we will come up with a schedule. Some flexibility will be needed to accomodate problems and changes in plans.