77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
import ch.psi.pshell.epics.ControlledVariable as ControlledVariable
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if not prefix.endsWith("-RSYS"):
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prefix = args[0] + "-RSYS"
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start = caget(prefix + ":SET-SCAN-START")
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stop = caget(prefix + ":SET-SCAN-STOP")
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step = caget(prefix + ":SET-SCAN-STEP")
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lat = caget(prefix + ":SET-SCAN-WAIT-TIME")
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nb = caget(prefix + ":SET-NUM-AVERAGE")
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bpm_ch = caget(prefix + ":DBPM")
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disp = caget(bpm_ch + ":DISPERSION")
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energy0 = caget(bpm_ch + ":ENERGY")
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rf_phase_var = ControlledVariable("Phase", prefix + ":SET-VSUM-PHASE-SIM", prefix + ":GET-VSUM-PHASE-SIM")
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rf_phase_var.config.minValue =-180.0
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rf_phase_var.config.maxValue = 180.0
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rf_phase_var.config.resolution = 0.001
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rf_phase_var.initialize()
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rf_ampl_rbk = Channel(prefix + ":GET-VSUM-AMPLT-SIM", type = 'd', alias='Amplitude Readback')
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rf_power_rbk = Channel(prefix + ":GET-KLY-POWER-SIM", type = 'd', alias='Power Readback')
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bpm_x = Channel(bpm_ch, type = 'd', alias='BPM-X')
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#TODO: update the plot dynamically
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def after(rec):
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pass
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try:
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r = lscan(rf_phase_var, [rf_ampl_rbk, bpm_x], start, stop, step , latency=lat, passes = nb, after_read = after)
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rf_phase = r.getPositions(0)
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energy = [x/1000.0/disp*energy0 for x in r.getReadable(1)]
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caput(prefix + ":GET-PHASE-ARRAY", rf_phase)
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caput(prefix + ":GET-ENERGY-ARRAY", energy)
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phase_fit_max = None
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try:
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(energy_max, angular_frequency, phase0, phase_fit_max, fit_x, fit_y) = hfit(energy , xdata = rf_phase)
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except:
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raise Exception("Fit failure")
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caput(prefix + ":GET-FIT-PHASE-ARRAY", fit_x)
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caput(prefix + ":GET-FIT-ENERGY-ARRAY", fit_y)
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phase_min, phase_max = min(phase), max(phase)
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if not (phase_min <= phase_fit_max <= phase_max):
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raise Exception("Fit maximum outside scan range")
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rf_phase_var.write(phase_fit_max)
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time.sleep(lat)
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ampl = rf_ampl_readback.read()
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power = rf_power_rbk.read()
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finally:
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rf_phase_var.close()
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rf_ampl_rbk.close()
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rf_power_rbk.close()
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bpm_x.close()
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print ("------------------------------------")
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print ("Valid fit")
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energy_gain = energy_max
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phase_offset = - phase_fit_max
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amplitude_scale = energy_gain / ampl
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power_scale = power / math.pow(ampl,2)
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caput(prefix + ":CALC-VSUM-PHASE-OFFSET", phase_offset)
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caput(prefix + ":CALC-VSUM-AMPLT-SCALE" , amplitude_scale)
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caput(prefix + ":CALC-VOLT-POWER-SCALE" , power_scale)
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set_return("Energy Gain: " + str(energy_gain) + "\n" +
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"Phase Offset: " + str(phase_offset) + "\n" +
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"Amplitude Scale: " + str(amplitude_scale) + "\n" +
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"Power Scale: " + str(power_scale))
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