Difference between revisions of "Spot++"

From PREX Wiki
Jump to: navigation, search
Line 5: Line 5:
 
#* <font color="blue"> CASE 2</font> If you run with pulser trigger T8 spot++ gives a view of the rastered spot size.
 
#* <font color="blue"> CASE 2</font> If you run with pulser trigger T8 spot++ gives a view of the rastered spot size.
 
# At 20 nA the BPM plots look funny (= no signal)
 
# At 20 nA the BPM plots look funny (= no signal)
# Note: [[Switching Modes#Note about high voltages|Scintillator HVs (S0A,B and S3 in each arm)]] need to be on to do spot++
 
 
# In case 1 or 2 above, the most important plot is on the first page, titled "beam on target y vs x", for example:
 
# In case 1 or 2 above, the most important plot is on the first page, titled "beam on target y vs x", for example:
 
https://logbooks.jlab.org/system/temporary/FADC_prex_21079.pdf
 
https://logbooks.jlab.org/system/temporary/FADC_prex_21079.pdf
Line 12: Line 11:
 
#* <font face="Courier">ssh –X aonl@aonl2 –l a-onl</font>
 
#* <font face="Courier">ssh –X aonl@aonl2 –l a-onl</font>
 
# If part of a [[Beam Recovery]] procedure, make sure you have taken a CODA run in [[CODA#Starting Counting Mode DAQ CODA | counting mode]] for the LHRS
 
# If part of a [[Beam Recovery]] procedure, make sure you have taken a CODA run in [[CODA#Starting Counting Mode DAQ CODA | counting mode]] for the LHRS
 +
# [[Switching Modes#Note about high voltages|Scintillator HVs (S0A,B and S3 in each arm)]] need to be on to do spot++
 
#Then type either:
 
#Then type either:
 
#* <font face="Courier"> spot_L ''run#'' </font> for the LHRS (Recommended) <p> <font face="Courier"> spot_R ''run#'' </font> for the RHRS </p>
 
#* <font face="Courier"> spot_L ''run#'' </font> for the LHRS (Recommended) <p> <font face="Courier"> spot_R ''run#'' </font> for the RHRS </p>

Revision as of 17:31, 24 July 2019


PREX Main<< Information for Shift Takers << Shift Leader << HOW TOs

  1. Purpose: to check the rastered beam size.
    • CASE 1 If you run with T1 trigger and target in place, spot gives a view of the target density.
    • CASE 2 If you run with pulser trigger T8 spot++ gives a view of the rastered spot size.
  2. At 20 nA the BPM plots look funny (= no signal)
  3. In case 1 or 2 above, the most important plot is on the first page, titled "beam on target y vs x", for example:

https://logbooks.jlab.org/system/temporary/FADC_prex_21079.pdf

How To Run spot++

  1. You need to be logged on to the a-onl account
    • ssh –X aonl@aonl2 –l a-onl
  2. If part of a Beam Recovery procedure, make sure you have taken a CODA run in counting mode for the LHRS
  3. Scintillator HVs (S0A,B and S3 in each arm) need to be on to do spot++
  4. Then type either:
    • spot_L run# for the LHRS (Recommended)

      spot_R run# for the RHRS

    • If no run # is given, analyzes last run taken
  5. Plots should pop up after a few seconds
  6. When prompted, type y or n to upload the plots to the Elog (or not)


  • output file goes to:
/chafs1/work1/spot/
  • (For experts) macros, source codes, DB files are at:
/adaqfs/home/a-onl/rastersize/ 


Notes to be incorporated into the above list:

  • Need a link to how to run the HRS CODA
  • You can get "strange printouts" of errors if you only type spot++ and the last run was for R-HRS, so it's clearer to do what is listed above than to use spot++. (note, this is because spot++ is actually spot_L).
  • Hint: Type "spot help" to learn more options.

More Info

What do the plots mean?

Need to put examples of output when we have them

BPMA y vs x: Shows the beam location at BPM A

BPMA x: Shows the number of events at each x value in BPM A

BPMA y: Shows the number of events at each y value in BPM A

BPMB y vs x, BPMB x, BPMB y: Same as above but for BPM B

Beam at target y vs x, …x, …y: Same as above for at the target

BPMA Antenna 1, 2, 3, 4: Signal at the four wires of BPM A, one for X+, X-, Y+, Y-, respectively

BPMB Antenna 1, 2, 3, 4: Same as above but for BPM B

Cavity BCMs

ssh apar@adaq
~/scripts/showCav.C