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Last revised 06-Mar-02

March 2002 H(e,e'K) Runplan
Preliminaries

Before Starting:       Before beginning check the beam conditions. The OTR should be in the arc (if possible). Fast feedback should also be on, both energy and orbit locks and locked to Hall A. The 15 cm LH2 target should be in, and the MCC should be told to setup for 100 uA (but that we want to start at 25 uA first). Request a BCM calibaration if it was not done on Friday.

Beam Energy:       5.755  GeV. If the MCC reports differently get an updated table of kinematics from P. Markowitz (pager 584-5543) or M. Iodice (cell phone 876-1787).

Beam position:     Less than 0.100 mm for x and y for 3A and 3B

Raster size:           2.0x2.0mm in SPOT, and should be square. This is to match what we ran last year.

Beam Current:      Start at 25 microA on the 15 cm LH2. Expect singles rates of 40 Khz at 25 microA.

Target:                  15cm LH2
First Setting

Kinematics 11:          We will start at the Q2=1.93 (GeV/c)2, W=1.93 GeV setting. The right arm (used for electrons) will be at its maximum excitation here.

Spectrometer settings
Spectrometer Momentum Angle Collimator
Right  -3.145 GeV/c -18.60° 6msr
Left  +1.970 GeV/c 20.69° 6msr

 
 
Data taking

  •       Set the magnets first. The electron arm (e.g., the right HRS) is at the administrative maximum momentum of 3.14 GeV/c. Pay attention as the dipole ramps up. Call John LeRose if there is any difficulty. HALOG the magnet screen.

  •       Change the angles simultaneously. HALOG the angles and the vernier settings. [They should be set for this first angle hopefully.]

  •        The trigger setup needs to be set for a electron in the right arm and a kaon (of momentum PK=1.970) in the left arm. Coincidence gate width should be 100 ns.

  •       The prescales for T1,T2,T3 and T4 should be set to give less than 10 Hz trigger rate for each. T5 should be set to 1. The T8 prescale should be set to maximum. HALOG the prescale values. CODA should start in the COINC mode (which is buffered). If there are problems with VDC ringing then switch to UNBUFF for the CODA configuration.

  •        Need to check the header file : hdr_kaon11

  •        The data taking time is estimated to be 12.0 hours. Will need to update by doing a simultaneous replay. Also check detector spectra with the detector kumac.

  •        Take a short (15 minute) run at 25 uA then increase current to 75 uA and take the rest of the data.

  •        Take a short (15 minute) run at 25 uA on the 15 cm empty target with prescales set to give about 50--100 Hz for the single arm triggers..

  •        Change to the 4 cm dummy target and run again for 12 hours.

  •        Take a short (15 minute) run at 25 uA on the 4 cm empty target with prescales set to give about 50--100 Hz for the single arm triggers.

  •        Put in the multifoil target and take a 5 minute mainly singles run. Remember to change the prescales to 1 for T1 and T3. Keep T2 and T4 at less than 50 Hz. Use a beam current of 10 uA.
    • Second setting

    Kinematics 12:          The second setting is at the Q2=1.90 (GeV/c)2, W=2.00 GeV.

    Settings:     Change the electron arm first then take a 5 minute single arm run with the multifoil targets. Then change the hadron arm and take another 5 minute single arm run with the multifoil target.

    Beam and Target:      Double check that fast feedback locks on both energy and orbit are on. Spot should give a raster of 2.0x2.0mm or smaller. Change to the LH2 target. Again start at 25 microA on the 15 cm LH2. Expect singles rates of 40 Khz at 25 microA.

    Spectrometer settings:
    Spectrometer Momentum Angle Collimator
    Right  -3.018 GeV/c -18.84° 6msr
    Left  +2.147 GeV/c 19.30° 6msr

     
    Data taking
  •       Change the prescales back to what they were (as a starting point). Be sure the trigger is properly loaded (it should be the same).

  •       HALOG the settings (magnets, angles, prescales).

  •       The prescales for T1,T2,T3 and T4 should be set to give less than 10 Hz trigger rate for each. T5 should be set to 1. The T8 prescale should be set to maximum. HALOG the prescale values.

  •        Need to modify the header file :: hdr_kaon12

  •        The data taking time is estimated to be 12.0 hours. Will need to update by doing a simultaneous replay.

  •        Take a short (15 minute) run at 25 uA then increase current to 75 uA and take the rest of the data.

  •        Take a short (15 minute) run at 25 uA on the 15 cm empty target with prescales set to give about 50--100 Hz for the single arm triggers..
    • Third and Fourth settings

    Kinematics 13 and 14:          The next settings are the Q2=1.90 (GeV/c)2, W=2.00 GeV LT-interference part at a center-of-mass angle of 18 degrees or t = -.60 GeV2.

    Settings:     The electron arm stays fixed. Change the hadron arm and take a short 10 minute single arm run with the multifoil target.

    Beam and Target:      Double check that fast feedback locks on both energy and orbit are on. Spot should give a raster of 2.0x2.0mm or smaller. Change to the LH2 target. Again start at 25 microA on the 15 cm LH2.

    Spectrometer settings:
    Spectrometer Momentum Angle Collimator
    Right  -3.018 GeV/c -18.84° 6msr
    Left  +2.104 GeV/c 24.11 / 14.50 ° 6msr

     
      Data taking
  •       Change the prescales back to what they were (as a starting point). Be sure the trigger is properly loaded (it should be the same).

  •       HALOG the settings (magnets, angles, prescales).

  •       The prescales for T1,T2,T3 and T4 should be set to give less than 10 Hz trigger rate for each. T5 should be set to 1. The T8 prescale should be set to maximum. HALOG the prescale values.

  •        Need to modify the header files: hdr_kaon13, hdr_kaon14

  •        The data taking time is estimated to be 8.0 +8.0 hours. Especially here, we will need to update by doing a simultaneous replay. Double check with Mauro or Pete before changing.
    • Keep fields the same and switch kaon arm angle. HALOG the magnet screen after updating the angle settings.

  •        Take a short (15 minute) run at 25 uA on the 15 cm empty target. Also call the Hall A tech for the next angle change.
    • Fifth and Sixth settings

    Kinematics 15 and 16:          The next settings are the Q2=1.90 (GeV/c)2, W=2.00 GeV LT-interference part at a center-of-mass angle of 26 degrees.

    Settings:     The electron arm stays fixed. Call the Hall A tech to change the hadron arm and start with a short 10 minute single arm run with the multifoil target.

    Beam and Target:      Double check that fast feedback locks on both energy and orbit are on. Spot should give a raster of 2.0x2.0mm or smaller. Change to the LH2 target. Again start at 25 microA on the 15 cm LH2.

    Spectrometer settings:
    Spectrometer Momentum Angle Collimator
    Right  -3.018 GeV/c -18.84° 6msr
    Left  +2.060 GeV/c 12.50 / 26.17 ° 6msr

     
      Data taking
  •       Change the prescales back to what they were (as a starting point). Be sure the trigger is properly loaded (it should be the same).

  •       HALOG the settings (magnets, angles, prescales).

  •       The prescales for T1,T2,T3 and T4 should be set to give less than 10 Hz trigger rate for each. T5 should be set to 1. The T8 prescale should be set to maximum. HALOG the prescale values.

  •        Need to modify the header files: hdr_kaon15, hdr_kaon16

  •        The data taking time is estimated to be 8.0 +8.0 hours. Especially here, we will need to update by doing a simultaneous replay. Double check with Mauro or Pete before changing.
    • Keep fields the same and switch kaon arm angle. HALOG the magnet screen after updating the angle settings.

  •        Take a short (15 minute) run at 25 uA on the 15 cm empty target.
    • Seventh setting

    Kinematics:          The seventh setting is at the Q2=2.35 (GeV/c)2, W=1.80 GeV, maximum electron excitation.

    Settings:     Change the electron arm first then take a 5 minute single arm run with the multifoil targets. Then change the hadron arm and take another 5 minute single arm run with the multifoil target.

    Beam and Target:      Double check that fast feedback locks on both energy and orbit are on. Spot should give a raster of 2.0x2.0mm or smaller. Change to the LH2 target. Again start at 25 microA on the 15 cm LH2.

    Spectrometer settings:
    Spectrometer Momentum Angle Collimator
    Right  -3.145 GeV/c -20.43° 6msr
    Left  +1.741 GeV/c 22.66° 6msr

     
    Data taking
  •       Change the prescales back to what they were (as a starting point). Be sure the trigger is properly loaded (it should be the same).

  •       HALOG the settings (magnets, angles, prescales).

  •       The prescales for T1,T2,T3 and T4 should be set to give less than 10 Hz trigger rate for each. T5 should be set to 1. The T8 prescale should be set to maximum. HALOG the prescale values.

  •        Need to modify the header file : hdr_kaon1prime

  •        The data taking time is estimated to be 8.0 hours. Will need to update by doing a simultaneous replay.

  •        Take a short (15 minute) run at 25 uA then increase current to 75 uA and take the rest of the data.

  •        Take a short (15 minute) run at 25 uA on the 15 cm empty target.
    • Eighth setting

    Kinematics:          The eighth and final setting is at Q2=2.35 (GeV/c)2, W=1.85 GeV.

    Settings:     Change the electron arm first then take a 5 minute single arm run with the multifoil targets. Then change the hadron arm and take another 5 minute single arm run with the multifoil target.

    Beam and Target:      Double check that fast feedback locks on both energy and orbit are on. Spot should give a raster of 2.0x2.0mm or smaller. Change to the LH2 target. Again start at 25 microA on the 15 cm LH2.

    Spectrometer settings:
    Spectrometer Momentum Angle Collimator
    Right  -3.085 GeV/c -20.75° 6msr
    Left  +1.893 GeV/c 21.664° 6msr

     
    Data taking
  •       Change the prescales back to what they were (as a starting point). Be sure the trigger is properly loaded (it should be the same).

  •       HALOG the settings (magnets, angles, prescales).

  •       The prescales for T1,T2,T3 and T4 should be set to give less than 10 Hz trigger rate for each. T5 should be set to 1. The T8 prescale should be set to maximum. HALOG the prescale values.

  •        Need to modify the header file : hdr_kaon2prime appropriately.

  •        The data taking time is estimated to be 8.0 hours. Will need to update by doing a simultaneous replay.

  •        Take a short (15 minute) run at 25 uA then increase current to 75 uA and take the rest of the data.

  •        Take a short (15 minute) run at 25 uA on the 15 cm empty target for each setting.