Difference between revisions of "Spot++"

Revision as of 12:44, 19 July 2019

Purpose: to check the rastered beam size.
If you run with T1 trigger and target in place, spot gives a view of the target density.
If you run with pulser trigger T8 spot++ gives a view of the rastered spot size.
In either case, the most important plot is on the first page, titled "beam on target y vs x", for example:

You need to be logged on to the a-onl account
- ssh –X aonl@aonl2 –l a-onl
If part of a Beam Recovery procedure, make sure you have taken a CODA run in counting mode for the LHRS
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
Plots should pop up after a few seconds
When prompted, type y or n to upload the plots to the Elog (or not)

/chafs1/work1/spot/

/adaqfs/home/a-onl/rastersize/

Notes to be incorporated into the above list:

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).

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

Low Current running Cavity BCM nominal points
- The cavities are used in <0.5 uA running territory (for commissioning a lead target with spot ++ check)
Bob's EPICs variable printing to terminal script:

ssh apar@adaq
~/scripts/showCav.C

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+<br>
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 [[Main_Page|<B>PREX Main</B>]]<< [[Information for Shift Takers]] << [[Shift Leader]] << [[HOW TOs]]
+# <font color="magenta"> Purpose: to check the rastered beam size.</font>
+# If you run with T1 trigger and target in place, spot gives a view of the target density.
+# If you run with pulser trigger T8 spot++ gives a view of the rastered spot size.
+# In either case, 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++ ==
 # You need to be logged on to the a-onl account