Log entry time 12:17:15 on October 26, 2007

Entry number 209702

Pre-beam checklist:
  - detectors all working (check cosmics run)
  - GUIs all running and look good?
    - coda working on right AND left arm
  - Set momentum to 1.050 GeV/c for both arms
  - Target to EMPTY

Immediately after the sweep is done and we go to Controlled (or Power
Permit):
  - move the RHRS to 15 degrees
  - (leave the LHRS at its current position: 14.6 degrees)
  - Halog General Tools screen

Wait for MCC to tune back into our Hall.  When they hand beam over to us:
A] Commissioning Items
  0) Request Ion chamber calibration using 50 uA on the Loop3 Pb target
    - if it will be a while before they can do this, continue and come back
      later

  1) Harp scans using both A and B harps
    - 5 uA, EMPTY target, beam at 0,0
    - halog beam profile and position results along with BPM information
      (strip-chart and average values)

  2) OTR check
    - halog screen snapshot if it works

  3) If Harp B works then do a Bull's Eye scan for these positions:
      (0, 0), (+2,+2), (+2,-2), (-2,+2), (-2,-2)
      - We want BPM A and B to have (roughly) the same values for each point
        (so the beam is roughly parallel to the beamline).  Accuracies of
+-0.4
        or so is fine.
      - Be sure the BPMs and beam is stable, then start a CODA run for a few
        minutes, then request a Harp scan.
      - If the OTR is working take a screen snapshot or note the position
the OTR
        reports for each position too.
      - Halog a summary table with: 
          Requested Pos., Coda run#, Harp run#, ave. OTR Pos., ave. Harp
B Pos.
  4) Target Ladder scan:
    - Put target to Beam Left Carbon
    - Use RASTER ON: ask MCC for 10.0x5.0, 5--10uA, BPMs at 0,0
      - Do a spot++: we should see roughly 4x4mm on target (halog this)
      - Manually move target ladder UP in small steps while monitoring
trigger
        rates.  When you see the rates rise you know the beam is intercepting
        the frame.  Stop and halog the target encoder postion.
      - Put the target back to its correct position.
      - Manually move target ladder DOWN in small steps while monitoring
trigger
        rates.  You can use the previous data to anticipate how far you
have to
        go and the first few steps can be larger.  Stop and halog the target
        encoder postion.

  5a) Move to Optics target
  - take 1 hr of data for both arms, 50 uA, RASTER OFF
    - set prescales to take ~1400 Hz of T1, T3
                              100 Hz of T2, T4
    - keep deadtimes less than 20%
  5b) Change momentum to  450     MeV/c in LHRS ONLY.
      Change momentum to 1061.295 MeV/c in RHRS ONLY.  
          (This is for the next production point.)
    - Wait for Left dipole to stabilize, then take ~1 hour of data on
left arm.
      (You can take some RHRS runs too after it stabilizes.)

B] (Roughly) gain match the NaI cells using the data from step (4).

C] Production Data
  - Set the LHRS to 1061.295 MeV/c (cycle Q2/Q3!)
  - The RHRS should already be set correctly.
  - Move BOTH spectrometers to 60 degrees
    - NOTE: Be very careful that you're moving the spectrometers in the
correct
            direction. Start slow.
  - Move the target to He (Loop 1) while you're waiting
  - Use RASTER ON: ask MCC for 5.0x2.5
      - do a spot++: we should see roughly 2x2mm on target (halog this)

  - Work your way through the kinematics table.  The times are in seconds 
    (ie.  600s == 10 minutes).  The targets are:
      HE  ==> Loop 1 Helium           (50 uA)
      H2  ==> Loop 2 Hydrogen         (50 uA)  (not used until P0=697.2
MeV/c)
      Pb  ==> Loop 3 15cm He+Lead     (50 uA)
      C12 ==> Beam Left Carbon        (50 uA)
      C12 ==> Beam Left Iron          (50 uA)
  - NOTES: 
      - When you change momentum the LHRS will be ready first.  Start taking
        data as soon as it stabilizes.  When the RHRS is stable start taking
        runs with it too.
      - If the RHRS isn't going to stabilize before the LHRS is done with all
        the targets then put leapfrog the RHRS setting to the next
momentum on
        the list.  With luck the RHRS will stabilize at that setting by the
        time the LHRS finishes with the current momentum and you can start
        both arms together at the next point.