Difference between revisions of "SBS BPM calibration"

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(Performing a Bull's Eye Scan)
(Performing a Bull's Eye Scan)
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# Record the elog entry numbers for all HARP scans.  
 
# Record the elog entry numbers for all HARP scans.  
 
# Ask MCC to steer the beam to positions around the nominal center:
 
# Ask MCC to steer the beam to positions around the nominal center:
## (0,0), (2,2), (2,-2), (-2,-2), (2,-2), (3,3), (-3,-3), and repeat (0,0). Repeat HARP and CODA runs for each of these positions. Label the elog entries accordingly ([https://logbooks.jlab.org/entry/3324009 example]).
+
## (0,0), (2,2), (2,-2), (-2,-2), (2,-2), (3,3), (-3,-3), and repeat (0,0). Repeat HARP and CODA runs for each of these positions. Label and document the runs accordingly in a HALOG post ([https://logbooks.jlab.org/entry/3324009 example]).
 +
 
 +
= Taking a BPM Pedestal Run =
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# Ask MCC to set iocse10 to Forced gain = 0.
 +
# Take a CODA run
 +
# Use only clock triggers
 +
# Need about 100k events.
 +
# Ask MCC to set iocse10 to auto gain.
 +
 
 +
= Analyzing the Data =

Revision as of 15:56, 14 June 2021

Back to SBS How-To

Description

This section gives instructions to perform a Beam Position Monitor (BPM) calibration.

Performing a Bull's Eye Scan

Unrastered beam is required for this procedure

  1. Start a new CODA run with the description [BPM Calibration] Bull's Eye Scan
  2. Ask MCC to steer the beam to the nominal center of the target
  3. When the beam is stable, ask MCC to perform a HARP scan using the two SuperHARPs near the target, 1H04A and 1H04B. Request MCC to make an elog entry with the HARP scan results. All three HARP wires should be visible.
  4. Record the elog entry numbers for all HARP scans.
  5. Ask MCC to steer the beam to positions around the nominal center:
    1. (0,0), (2,2), (2,-2), (-2,-2), (2,-2), (3,3), (-3,-3), and repeat (0,0). Repeat HARP and CODA runs for each of these positions. Label and document the runs accordingly in a HALOG post (example).

Taking a BPM Pedestal Run

  1. Ask MCC to set iocse10 to Forced gain = 0.
  2. Take a CODA run
  3. Use only clock triggers
  4. Need about 100k events.
  5. Ask MCC to set iocse10 to auto gain.

Analyzing the Data