Log entry time 18:17:33 on June 24, 2004

Entry number 126691

Run Plan for HAPPEx Preparations: June 24-25, 2004
  R.J. Feuerbach

I. Calibrating HAPPEX detector/profile scanner to the VDCs.
  A. Establish beam (standard beam optics, thru Compton chicane):
     - With the Hall A detectors (scint, VDCs, etc) OFF
     - empty target
     - raster off
     - 5 microamps

     1. position centered at BPMB(x,y)=0 +/- 300 micron.
                             BPMA(x,y)=BPMB +/- 300 micron
     2. FFB for position/energy turned on
     3. Take harp scan to verify 'reasonable' size of beam spot (<300microns)
     4. Unrastered beam-spot position/profile verified with BeO viewer. Ask
        for the raster turned on (3.5x3.5) to better see the edges of the
        viewer. 

  B. Locate scanner/HAPPEx eC detectors vs. VDC. Using Spectrometer DAQ
        -- PAGE Bob Michaels
     1. Raster ON (3.5x3.5). Insert hydrogen target.
     2. Set spectrometer/septum momentum to elastic -10% (2.678 GeV/c and
        247.95A ) to accept the lower-rate radiative tail.
     3. CAREFUL: With beam current ~1 uA, turn on the Scintillators and
        check the rates. If it is less than 30 kHz per bar (spread evenly
        over the scintillators) on each HRS, turn on the VDCs.
     4. Set the prescales to even out the triggers from T1/3/5 and T2/4/6
        to select events from the Scintillator, HAPPEX detector and
	profile-scanner, respectively. Take 2M events.
     5. Set prescale to have 80% of the data from triggers T2/T4 (select
        HAPPEX detector) and evenly select the others. Take 1M events.
     6. Set prescale to have 80% of the data from triggers T5/T6 (select
        profile scanner). Take 1M events.

  C. Align elastic peak onto the HAPPEx detectors. Using Spect. DAQ
     1. IMPORTANT: Turn off VDC HV.
     2. Raster ON (3.5x3.5). Insert hydrogen target.
     3. Lower beam current to .5 microamps
     4. Set spectrometer momentum to the H2 elastic +1% ( 3.0055 GeV/c and
        278.25A ).
     5. From the Spec-DAQ, turn down the beam current until the T1/T3 rates
        are less than 200 kHz. The minimum current possible and still have
        reasonable sensitivity to the BPMs.
     6. Set prescale factors to even-out the T1/T2/T5 and T3/T4/T6 rates.
     7. Take 10 min of data.
     8. Drop momentum to H2 elastic ( 2.9758 GeV/c and 275.50 A ), take
        data.
     9. Put peak on detector, peak 2-3cm from upper edge.
    10. When finished, TURN OFF VDCs, Scintillators, and other standard
        detectors. 

II. Optimizing target settings
       -- PAGE Kent Paschke to anticipate this
  A. Settings for target test  ( Raster ON (3.5x3.5) hydrogen target )
     1. Switch to integrating mode -- CHECKLIST
     2. At 5 microamps of beam, set HV to have Lumi's and eC detector peaks
        at 5000 channels.
     3. Take two dithering-cycles worth of data.
     4. Optimize the target position: with raster on, move the beam +/- 1mm
        in X and +/- 1mm in Y at BPMB -- a separate run for each to monitor
        the lumi rates (5 min each).

  B. Target test -- WATCH Target cooling !!!!
     0. During the tests please record information, according to the table
        below, into the HALOG.
     1. Beam current to 20 microamps. Wait 15min for the septum temperature
        to plateau.
     2. Take seven runs (15min) varying the fan speed and raster size.
             Fan speed (Hz)    Raster Size (mm)
                 24          3.5x3.5
                 48          3.5x3.5
                 70          3.5x3.5
                 24           1 x 1
                 48           1 x 1
                 70           1 x 1
                 60          3.5x3.5
     3. Keeping fan-speed at 60Hz and raster at 3.5x3.5, increase beam
        current in 5 microamp steps watching the septum temps. 15 min
        runs. Keep septum temperature below 7.75 K to prevent a quench or
        trip. 

III. Begin Production running
    raster =  3.5x3.5mm^2
    5 microamp less than max current
    fan speed = 60 Hz


 CHL flow = xx.x g/s, JT valver = xx%
 target input temps: x.x K, output temp x.x K

 - raster = xxxxx
 - at each setting, let septa temps stabilize so that stable to within
    +-0.05 K for 5 minutes

Run   Event Beam        target         Right coil   Left coil    Lumi    Det
        #            fan  HPHtr Press  upper lower upper lower  widths  widths
       (K)  (muA)   (Hz)  (W)  (psi)    (K)   (K)  (K)    (K)
----------------------------------------------------------------------------