54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
# Tool to align the laser on the cathode.
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# S. Bettoni, A. Gobbo, D. Voulot
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# 30/05/2016
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from operator import sub
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# Procedure:
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# switch off all the magnets between the gun solenoid and the screen or BPM used for the measurement
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# change the phase of the gun RF
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# look at the centroid position (BPM or screen) downstream of the gun.
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phi_set = Channel("SINEG01-RSYS:SET-BEAM-PHASE")
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phi = Channel("SINEG01-RSYS:GET-BEAM-PHASE")
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cam_x, cam_y = ... # some camtool command / channel?
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bpm_x = Channel("SINEG01-DBPM340:X1")
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bpm_y = Channel("SINEG01-DBPM340:Y1")
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phi1 = 20.0
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phi2 = 150.0
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dphi = 1.0
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# Switch off magnets
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caput("SINEG01-MCRX120:I-SET", 0.0)
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caput("SINEG01-MCRY120:I-SET", 0.0)
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caput("SINEG01-MQUA140:I-SET", 0.0)
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caput("SINEG01-MQUA150:I-SET", 0.0)
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caput("SINEG01-MCRX160:I-SET", 0.0)
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caput("SINEG01-MCRY160:I-SET", 0.0)
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caput("SINEG01-MCRX180:I-SET", 0.0)
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caput("SINEG01-MCRY180:I-SET", 0.0)
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# Disable laser delay
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caput("SIN-CVME-TIMAST-TMA:LaserDelayControl", 0)
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# Scan using the screen
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#r = lscan(phi_set, [phi, cam_x, cam_y], phi1, phi2, dphi, passes = 2, zigzag = True, before_read = CheckCurrent)
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# Scan using the BPM
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r = lscan(phi_set, [phi, bpm_x, bpm_y], phi1, phi2, dphi, passes = 2, zigzag = True, before_read = CheckCurrent)
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# Enable laser delay
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caput("SIN-CVME-TIMAST-TMA:LaserDelayControl", 1)
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# take the result of the scan and do the plots
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x = r.getReadable(1)
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y = r.getReadable(2)
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plot(y, xdata=x, title = "CM")
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# save the entry in the logbook
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msg = str(r)
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msg = msg + "\nFile: " + get_context().path
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msg = msg + "\n\n" + r.print()
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elog("Gun solenoid current scan", msg , get_plot_snapshots())
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