Run plan for  August 26-27, 2002.


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 II. Field on efficiency and t0 check:

    Beam tune = 120MeV/c spray pions: 
    restore slits from m13dev_120_all_slits.snap,
    then restore magnets from m13dev_120_all_spray.snap.
    Adjust rate if necessary by proportionally varying F0V and F0H.

    Gas degrader=100% (Does not matter here. Set to 100% and take data without waiting),
    Trigger=DS, PU, M (take 8  2GB runs with each)

    run 120 MeV/c spray pions through the detector, illuminating as
    many wires as the field will permit. It may not be possible to get them
    all. However, if the wires that are illuminated are all unchanged, as
    expected, that's okay. Take data with the DS trigger to cross check that
    the efficiencies and t0's are unchanged with field on.

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 III. Systematics studies

* Now (after taking the t0 data!) fix thresholds for PC2.
  Nominal settings (from Marc's posting):

	HV DC=1900V, threshold=-125mV;

	Outer PC: HV=2050V, threshold= -300mV for ganged wires, 
				       -250mV for central wires;

	Target PC: HV=2000V, threshold=-150mV


* Note that we start the program below at a partial  (thus,
  non-uniform!) field. 


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    Beam tune = (multiple),
    Gas degrader=100% He

    Trigger= M1L*M2L

    a. Study the positron "kinks and deltas". Find a channel tune that brings
    beam positrons into the spectrometer with a moderately large p-perp.
    This may imply mis tuning B2 relative to B1. Then take 10M beam positron
    events each at 30, 35, 40, 45, 50 MeV/c. 
    
    *Save the beam tunes*
    *May want to re-take the data at the full field.*


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    Tune the surface muon beam to stop as close to the center of the
    target as we know how to, without a lot of screwing around.
    (NOTE: This is NOT meant to be a PACT tuning or beam stopping
    study!)

    Beam tune = m13dev_29p4_all.snap (restore slits as well),    
    Gas degrader=40% He, wait for 30 minutes.
    Trigger= M


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    b0. Quick study of the (clean evts/all evts) vs rate. What's the
   	DAQ limit on the rate for mu decay data?
    

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    "high rate" data sample at the partial field:

    Take stopped muon data. Continue data taking during the ramp to
    2T.


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    After B is stable:

    Re-take  the "kinks and deltas" data 10M/momentum at the full
    field using the prepared beam tunes.


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    b.  "high rate" data sample: take a data set with statistics
    equivalent to 20 hours @ 2KHz. 
    ###1 day### => 3 days total

================================================================