BCM Calibration Runs

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BCM Calibrations [2 hours]

Procedure:

1. It is useful to have someone over in MCC to help coordinate the calibration with them.
2. The target used in this calibration is irrelevant, so try to use a solid target if possible but not necessary.
3. Start the LHRS and RHRS runs with no beam and with a clock prescale LHRS=100.
4. Ask to mcc for the set of currents: I = 0, 3, 0, 5, 0, 10, 0, 15, 0, 22.5, 0,3, 0, 5, 0, 10, 0, 15,0, 22.5, μA. Each current should be send for at least 90 seconds
5. Take data on carbon target with I = 0, 3, 0, 5, 0, 7, 0, 10, 0, 15, 0, 20, 0, 25, 0, 30, 0, 40, 0, 50, 0, 60, 0, 70, 0, 80, 0 μA (or as high a current as available). Each beam period (with or without current) should last 90 s. If you get a trip during a beam up period, take 90s of beam off and restart that beam up period. If you get a trip during a beam up period, take 90s of beam off and restart that beam up period.

   Date	LHRS CODA run	RHRS CODA run	Comments

   
   

   Unser Calibration [2 hours]

   1. The unser calibration is done using the wire and the current source in the Counting House, without beam time (any opportunistic time when there is no beam).
   2. Use the wire to calibrate the unser. To access to the wire current supply, in epics look for the Hall A Menu -> BCM -> Unser monitor.
   3. Send to the wire different currents 0,5,0,20,0,40,0,60,0,80,0,100,0 (uA). Each current should be send for at least 90 seconds. Record the data from the DAQ system.
   4. The unser is a very noisy device. Therefore, the 0 (uA) are sent to subtract the local background for each current.
   5. In a graph of the current vs the frequency recorded by the DAQ, and calculate the gain of the linear fit. The offset of the graph should be nearly zero, since the local background was subtracted.
6. Also start a HRS run to record the scalers during the calibration procedure, use the clock to take reasonably high data rate (LHRS Clock =100)
7. It is useful to have someone over in MCC to help coordinate the calibration with them.
8. Take data on carbon target with I = 0, 3, 0, 5, 0, 7, 0, 10, 0, 15, 0, 20, 0, 25, 0, 30, 0, 40, 0, 50, 0, 60, 0, 70, 0, 80, 0 μA (or as high a current as available). Each beam period (with or without current) should last 90 s. If you get a trip during a beam up period, take 90s of beam off and restart that beam up period.