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."
Example #2
0
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."
Example #3
0
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)