Difference between revisions of "RunPlan"

Revision as of 18:43, 10 February 2010

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.

Spillover from Beam Restore

• Basic Beam Setup -- 2 shifts   Jay Benesch, Bteam
  
• Source and Parity Quality Beam -- 2 shifts   Kent Paschke, Mark Dalton, Rupesh Silwal
  

Low Current Checkout with Water Cell (3-4 calendar days)

• Septum checkout -- 2 shifts
  • Septum Commissioning (Priority activity) --   Bob Michaels, John LeRose
    • Verify septum does not steer beam
    • Thin target, low-current checks with A_T hole blocked
  • Low-current cavities --   John Musson, Zafar Ahmed
    • Need before Optics and Q²
    • Should be on Day shift
  • VDC Checkout --   Dustin McNulty, Alexandre Camsonne, Bob Michaels
    • First spectra on specific thin targets
    • Learn to measure rates to 10%
    • Characterize collimator with A_T hole blocked
  • Integrating detector checkout --   Dustin McNulty, Piotr Decowski, Jon Wexler
    • Detector pulse height spectra
    • If possible, compare 6 and 10 mm blocks
    • Map shadow of quartz in VDCs
  • LUMI checkout --   KK, Luis, Paul
    • Short runs at high current on Tantalum target
    • Run early enough before access for manipulating A_T tungsten plugs
• A_T hole characterization -- 1 shift
  • Effect of graphite plugs (Priority activity) --   Bob Michaels, Dustin McNulty
    • Accesses as needed to study impact of plugs
  • GEM checkout --   Ole Hansen, Alexandre Camsonne, Nilanga Liyanage
    • First attempt at GEM commissioning
    • Take separate runs centered on A_T hole flux
    • Identify Quartz detector shadow in GEM coordinates
• Water Cell & Optics -- 2 shifts
  • Absolute angle measurement (Priority activity) --   Nilanga et al
    • Sieve Slit runs
    • Angle calibration
    • Access to remove water cell; then cool the target -- Dave Meekins
  • Parasitic GEM/Detector studies --   GEM & Detector teams
    • Accumulate statistics on detector pulse height
    • Learn to measure rates to 10% with GEMs
    • A_T hole alignment

Lead Target Checkout (1-2 calendar days)

• High Current Commissioning -- 1 shift
  • Production target checkout (Priority activity) --   Bob Michaels et al
    • 100 uA on thick Lead, monitor radiation levels, establish luminosity limits
  • Electronics commissioning --   KK, Luis, Paul et al
    • Establish LUMI performance characteristics
    • Detailed measurements of various oversampling configurations
• Parity Commissioning -- 1 shift
  • Parity Quality (Priority activity) --   Kent, Rupesh, Luis, Dustin et al
    • IA feedback, beam modulation
    • Evaluate LUMI regression performance
  • Beam monitor calibrations --   Diancheng Wang, Xiaoyan Deng
    • Bulls-eye scan, fixed gain BPM calibration, BCM calibration
• Q² Measurement -- 1 shift
  • Establish Q² measurement sequence (Priority activity) --   Dustin, Nilanga et al
    • Drift chamber rate measurement at a few nA
    • parasitic GEM commissioning
    • try to establish a rate in GEMs, especially in quartz shadow, at a few uA
  • ARC energy measurement --   Arun Saha
• High Luminosity Detector Commissioning -- 1 shift
  • Characterization of Integrating Detector response (Priority activity) --   KK, Jon, Dustin et al
    • Evaluate detector and LUMI noise peformance
    • Evaluate BPM performance; compare strip-line regression to cavity regression
  • Final parasitic GEM commissioning --   Ole, Nilanga et al
    • Compare predicted and measured integrating width prediction at moderate current on thick target

Polarimetry Checkout (4-5 calendar days)

• 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

Establishing Production (2-3 calendar days)

• Production Checkout -- 3 shifts
  • Final detector alignment checks
  • Final LUMI/noise/helicity flip rate checks
  • Final beam modulation tweaks
  • Quick check for gross non-linearities
  • 4 hours longitudinal polarization production data
• Transverse Polarization -- 3 shifts
  • Double-Wien Spin Manipulator Commissioning --   Joe Grames
  • Spin dance
  • 8 hours transverse vertical polarization production
  • 8 hours transverse horizontal polarization production

Important Activities after few days of production

• Linearity Studies -- 1 shift   Rupesh Silwal, Kent Paschke, Luis Mercado
• 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 15 days !   Based on this list, each day we will come up with an adjustment to the Daily Run Plan. Some flexibility will be needed to accomodate problems and changes in plans.