def pescan(function=2, frequency=0.1, amplitude=10.0, shift=0.0, symmetry=50.0, number_of_pre_cycles=1,number_of_points_per_cycle=40.0, detector=mythen, ng=1, nf=1):
#setup function generator
fg.setFunction(function)
fg.setFrequency(frequency)
fg.setAmplitude(amplitude)
fg.setShift(shift)
fg.setSymmetry(symmetry)
sleep(2)
#derived parameters for pescan() function inputs
fg_frequency=fg.getFrequency()
fg_period=1/fg_frequency
starttime=number_of_pre_cycles * fg_period
stoptime=starttime+fg_period
gatewidth=fg_period/number_of_points_per_cycle
voltage.setNumberOfGates(ng)
electrometer.setNumberOfGates(ng)
voltage.addMonitor(1)
electrometer.addMonitor(1)
directory=PathConstructor.createFromDefaultProperty()
scanNumber=scanNumTracker.incrementNumber()
voltage.setFilename(directory+(str(scanNumber)))
electrometer.setFilename(directory+(str(scanNumber)))
#pre-conditioning
fg.setOutput(1)
timer=_Timer()
timer.start()
print "sample pre-conditioning cycles, please wait for %s" % starttime
while(not timer.hasElapsed(starttime)):
sleep(1)
#collection
collectionNumber=0
try:
for t1 in frange(starttime, stoptime, gatewidth):
#print t1
voltage.resetCounter()
voltage.setRepetition(collectionNumber)
electrometer.resetCounter()
electrometer.setRepetition(collectionNumber)
print "move event receiver to delay=%s width=%s" % (t1-starttime, gatewidth)
evr.moveTo([t1-starttime,gatewidth])
mythen.gated(nf, ng, scanNumber, collectionNumber)
collectionNumber += 1
#print "end loop"
interruptable()
except:
raise
finally:
print "end loop"
voltage.removeMonitor()
electrometer.removeMonitor()
#stop ramp output
fg.setOutput(0)
print "scan completed."
def pescan(
starttime=pre_condition_time,
stoptime=stop_time,
gatewidth=gate_width,
mythen1=mythen,
ng=number_gates,
nf=number_frames,
):
# setup
voltage.setNumberOfGates(ng)
electrometer.setNumberOfGates(ng)
voltage.addMonitor(1)
electrometer.addMonitor(1)
directory = PathConstructor.createFromDefaultProperty()
scanNumber = scanNumTracker.incrementNumber()
voltage.setFilename(directory + ("/") + (str(scanNumber)))
electrometer.setFilename(directory + ("/") + (str(scanNumber)))
# pre-conditioning
fg.setOutput(1)
timer = _Timer()
timer.start()
print "sample pre-conditioning cycles, please wait for %s" % starttime
while not timer.hasElapsed(starttime):
sleep(1)
# collection
collectionNumber = 0
try:
for t1 in frange(starttime, stoptime, gatewidth):
# print t1
voltage.resetCounter()
voltage.setCollectionNumber(collectionNumber)
electrometer.resetCounter()
electrometer.setCollectionNumber(collectionNumber)
print "move event receiver to delay=%s width=%s" % (t1 - starttime, gatewidth)
evr.moveTo([t1 - starttime, gatewidth])
mythen.gated(nf, ng, scanNumber, mythen.getDataDirectory(), collectionNumber)
collectionNumber += 1
# print "end loop"
interruptable()
except:
raise
finally:
print "end loop"
voltage.removeMonitor()
electrometer.removeMonitor()
# clearup
# voltage.removeMonitor()
# electrometer.removeMonitor()
# stop ramp output
fg.setOutput(0)
print "scan completed."
def pescan(func=2,freq=0.125,amp=5.0,shift=0.0,symmetry=50.0,trig=1,bmode=0,bncycle=1,bstate=0,
nprecycles=1,nptspercycle=40, det=mythen, ng=1, nf=1):
#setup func generator 2
fg2.setFunction(1) # square wave
fg2.setAmplitude(5.0)
fg2.setShift(2.5)
fg2.setDutyCycle(50.0)
fg2.setTriggerSource(trig)
fg2.setBurstState(0) # switch off burst mode before change burst parameters
if (freq<=0.125): # slow HV ramping
fg2.setFrequency(freq*nptspercycle)
fg2.setBurstNCycle(nptspercycle)
else: # fast HV ramping
fg2.setFrequency(freq)
fg2.setBurstNCycle(1)
fg2.setBurstMode(bmode)
fg2.setBurstState(1) #switch on burst mode
sleep(1)
#setup func generator 1
fg1.setFunction(func) # 2 - ramp
fg1.setFrequency(freq)
fg1.setAmplitude(amp)
fg1.setShift(shift)
fg1.setSymmetry(symmetry)
fg1.setTriggerSource(trig)
fg1.setBurstState(bstate) # switch off burst mode
fg1.setBurstMode(bmode)
fg1.setBurstNCycle(bncycle)
sleep(1)
#calculate acquisition parameters
fg1_frequency=fg1.getFrequency()
fg1_period=1/fg1_frequency
starttime=nprecycles * fg1_period
stoptime=starttime+fg1_period # only one cycle
gatewidth=fg1_period/nptspercycle # no need to minus file writing time as FIFO can buffer 4 frames
#setup ADC to capture PE data
peobject.addMonitor(1)
peobject.setFirstData(True)
#setup file name
directory=PathConstructor.createFromDefaultProperty()
scanNumber=scanNumTracker.incrementNumber()
peobject.setFilename(directory+(str(scanNumber)))
#pre-conditioning
evr.disable()
timer=_Timer()
timer.start()
fg2.setOutput(1)
fg1.setOutput(1)
print "sample pre-conditioning cycles, please wait for %s" % starttime
while(not timer.hasElapsed(starttime)):
sleep(0.01)
#collection
collectionNumber=0
evr.enableField()
try:
if (freq<=0.125): # 8sec period, 200ms per point
peobject.reset()
peobject.setFastMode(False)
evr.moveTo([0.0,gatewidth-0.15]) #150 ms writing to disk allowed
print "move event receiver to delay=%s width=%s" % (evr.getDelay(), evr.getWidth())
print "start mythen %d" % time()
pos fastshutter "OPEN"
mythen.gated(nptspercycle, ng, scanNumber)
pos fastshutter "CLOSE"
peobject.save()
else:
peobject.setFastMode(True)
for t1 in frange(starttime, stoptime, gatewidth)[:-1]:
#print t1
peobject.reset() # reset the gate counter
print "move event receiver to delay=%s width=%s" % (t1-starttime, gatewidth)
evr.moveTo([t1-starttime,gatewidth])
print "start mythen %d" % time()
pos fastshutter "OPEN"
mythen.gated(nf, ng, scanNumber, collectionNumber) # block until all frames and gates are collected
pos fastshutter "CLOSE"
collectionNumber += 1
peobject.save(collectionNumber)
interruptable() # allow "StopAll" to work
except:
raise
finally:
print "collection completed at %d" % time()
peobject.removeMonitor() # ensure monitor removed
pestop()
#stop ramp output
fg2.setOutput(0)
fg1.setOutput(0)