Difference between revisions of "RunPlan"

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(Establishing Production (2-3 calendar days))
(Establishing Production (2-3 calendar days))
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== Establishing Production (2-3 calendar days) ==
 
== Establishing Production (2-3 calendar days) ==
 
<UL>
 
<UL>
<LI> <font color="red">Production Checkout</font> -- <font color="green">3 shifts</font>
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<LI> <font color="red">Production Checkout</font> -- <font color="green">2 shifts</font>
 
<UL>
 
<UL>
 
<LI> Final detector alignment checks
 
<LI> Final detector alignment checks
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</UL>
 
</UL>
  
<LI> <font color="red">Transverse Polarization</font> -- <font color="green">3 shifts</font>
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<LI> <font color="red">Transverse Polarization</font> -- <font color="green">4 shifts</font>
 
<UL>
 
<UL>
 
<LI> <font color="green">Double-Wien Spin Manipulator Commissioning</font> -- &nbsp; Joe Grames
 
<LI> <font color="green">Double-Wien Spin Manipulator Commissioning</font> -- &nbsp; Joe Grames

Revision as of 23:44, 19 February 2010

PREX Run Plan for   Commissioning   and   Auxiliary Measurements

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 (4-5 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 UNblocked
      • First checks of backgrounds and the efficacy of the collimator.
    • 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% and study rate dependence effects
      • Characterize collimator with A_T hole UNblocked
    • Quartz detectors checkout --   Dustin McNulty, Piotr Decowski, Jon Wexler
      • Detector pulse height spectra
      • If possible, compare 6 and 10 mm blocks
      • Map shadow of quartz (both primary and A_T hole) in VDCs
      • Calibrate detector x-y movers in VDC coordinates
    • GEM checkout --   Ole Hansen, Alexandre Camsonne, Nilanga Liyanage
      • First attempt at GEM commissioning
      • Identify Quartz detector shadows in GEM & VDC coordinates
  • A_T hole characterization -- 3 shifts
    • Determine placement of A_T detectors (Priority activity) --   Bob Michaels, Dustin McNulty
      • Thick lead target with A_T hole UNblocked (low current, no cooling!)
      • Build in ONE access to block A_T hole
      • Thick lead target with A_T hole blocked (low current, no cooling!)
    • LUMI checkout --   KK, Luis, Paul
      • Short runs at high current on Tantalum target AFTER access to block A_T hole
    • 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
      • Place A_T hole detector such that rate is ~ 100 times less than main detector (with thick target)
  • 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

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 10-100 nA
    • ARC energy measurement --   Arun Saha
  • High Luminosity Detector Commissioning -- 1 shift
    • Characterization of Integrating Detector response (Priority activity) --   KK, Jon, Dustin et al
      • Evaluate primary detector and LUMI noise peformance
      • Evaluate BPM performance; compare strip-line regression to cavity regression
      • Establish empirical figure of merit for A_T hole detector
    • 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 -- 2 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 -- 4 shifts
    • Double-Wien Spin Manipulator Commissioning --   Joe Grames
    • Spin dance
    • 4 hours transverse vertical polarization production
    • 2 shifts transverse horizontal polarization production

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.

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