66 lines
1.8 KiB
Python
Executable File
66 lines
1.8 KiB
Python
Executable File
# Tool to align the laser on the cathode.
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# S. Bettoni, A. Gobbo, D. Voulot
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# 16/06/2016
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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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cam_x = Channel("SINEG01-DSCR190:profile.X_stats.com", alias = "cam_x")
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cam_y = Channel("SINEG01-DSCR190:profile.Y_stats.com", alias = "cam_y")
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bpm_x = Channel("SINEG01-DBPM340:X1", alias = "bpm_x")
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bpm_y = Channel("SINEG01-DBPM340:Y1", alias = "bpm_y")
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def ccr(mag):
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n = 1
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while n > 0:
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sleep(0.5)
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n = caget(mag + ":I-COMP")
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def laser_on():
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caput("SIN-TIMAST-TMA:Beam-Las-Delay-Sel", 0)
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def laser_off():
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caput("SIN-TIMAST-TMA:Beam-Las-Delay-Sel", 1)
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phi1 = 20.0
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phi2 = 30.0
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dphi = 1.0
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settling_time = 0.1
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# Switch off magnets
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mag = [ "SINEG01-MCRX120","SINEG01-MCRY120",
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"SINEG01-MQUA140",
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"SINEG01-MQUA150",
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"SINEG01-MCRX160","SINEG01-MCRY160",
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"SINEG01-MCRX180","SINEG01-MCRY180",
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"SINEG01-MCRX200","SINEG01-MCRY200",
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"SINEG01-MCRX220","SINEG01-MCRY220",
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"SINEG01-MQUA310",
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"SINEG01-MQUA320" ]
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for m in mag:
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caput(m + ":I-SET", 0.0)
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for m in mag:
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ccr(m)
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def br():
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pass
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def ar():
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pass
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laser_on()
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try:
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r = lscan(gun_phase, [bpm_x, bpm_y], phi1, phi2, dphi, settling_time, before_read = br, after_read = ar)
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finally:
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laser_off()
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# take the result of the scan and do the plots
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plot(r.getReadable(1), xdata=r.getReadable(0), title = "Centroid excursion")
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#add_convex_hull_plot ("Centroid excursion", r.getReadable(0),r.getReadable(1), "Name")
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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 laser alignment", msg , get_plot_snapshots())
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