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This page holds a few example code-snippets for use in pyana analysis. The analysis is written in python and uses MatPlotLib.PyPlot for plotting of data. Compare with myana user examples to see how (some of) the same things can be done using the myana analysis framework.
Acqiris waveform data
This method can be used for any detector/device that has Acqiris waveform data. Edit the self.address field to get the detector of your choice.
Initialize class members:
The most reliable place for up-to-date information about all the event getters in pyana, see: https://confluence.slac.stanford.edu/display/PCDS/Pyana+Reference+Manual#PyanaReferenceManual-Classpyana.event.Event
For all the examples, you may assume that the pyana module contains a class with at least 'beginjob', 'event' and 'endjob' functions that starts something like this:
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title | outline of a pyana module |
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import numpy as np
import matplotlib.pyplot as plt
from pypdsdata import xtc
class mypyana(object):
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def __init__ ( self ,source=""):
#self.source initialize= datasource
self.addresscounter = "AmoITof-0|Acqiris-0"None
self.dataarray = [] # really just a list
def beginjob(self,evt,env):
self.counter = 0
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If you're curious to see any of the Acqiris configuration, e.g. how many channels do we have, you can inspect the AcqConfig object:
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def event(self,evt,env):
def beginjob ( self, evt, env ) :.counter += 1
# snippet code goes here
cfgthedata = envevt.getConfigget( _pdsdata.xtc.TypeId.Type.Id_AcqConfigSomeType, self.addresssource )
self.array.num = cfg.nbrChannels()
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The read the event waveform data (an array) and append it to the self.data list:
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append( thedata.somevalue )
def event endjob( self, evt, env ) :
print channel"Job =done! 0
Processed %d events. " % self.counter
acqData = evt.getAcqValue( self.address, channel, env)# place for plotting etc
# ifconvert acqDatafrom :
python list to a numpy array
self.counter+array =1
np.array( self.array )
wf = acqData.waveform() # returns a waveform array of numpy.ndarray type.plot graph
self.data.append(wf)
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At the end of the job, take the average and plot it:
BeamLine Data: EBeam
To read out energy, charge and position of the beam from the beamline data, use getEBeam()
. It returns a class/structure that has the following members/fields:
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def event(self,evt,env) |
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def endjob( self, env ) :
ebeam data = npevt.arraygetEBeam(self.data)
# this is an array of shape (Nevents, nSamples)
try :
beamChrg = ebeam.fEbeamCharge
beamEnrg = #ebeam.fEbeamL3Energy
take the mean of all events for eachbeamPosX sampling= timeebeam.fEbeamLTUPosX
xsbeamPosY = np.mean(data, axis=0)
ebeam.fEbeamLTUPosY
plt.plot(xs)
beamAngX = ebeam.fEbeamLTUAngX
beamAngY = plt.xlabel('Seconds')
ebeam.fEbeamLTUAngY
beamPkCr = plt.ylabel('Volts')
ebeam.fEbeamPkCurrBC2
print "ebeam: plt.show()
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Which gives you a plot like this
Image Removed
Beamline data (Bld)
To read out energy, charge and position of the beam from the beamline data, use getEBeam()
. It returns a class/structure that has the following members/fields:
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ebeam = evt.getEBeam()
", beamChrg, beamEnrg, beamPosX, beamPosY, beamAngX, beamAngY, beamPkCr
except:
print if"No ebeamEBeam :
beamChrg = ebeam.fEbeamCharge
beamEnrg = ebeam.fEbeamL3Energy
beamPosX = ebeam.fEbeamLTUPosXobject found"
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BeamLine Data: FEE Gas Detector
To read out the energy from the front end enclosure (FEE) gas detector, use getFeeGasDet()
. This returns and array of 4 numbers:
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title | getFeeGasDet |
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fee_energy_array = evt.getFeeGasDet()
gdENRC11 = fee_energy_array[0]
beamPosYgdENRC12 = ebeam.fEbeamLTUPosYfee_energy_array[1]
gdENRC21 = fee_energy_array[2]
gdENRC22 beamAngX = ebeam.fEbeamLTUAngXfee_energy_array[3]
energy = (gdENRC21 + gdENRC22) / 2.0
beamAngY = ebeam.fEbeamLTUAngY
# or use the first two that has a beamPkCr = ebeam.fEbeamPkCurrBC2different gain:
energy = (gdENRC11 + gdENRC12) / 2.0
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BeamLine Data: Phase Cavity
To read out fit time and charge of the phase cavity, use getPhaseCavity()
which returns a structure with the following fields:
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title | getPhaseCavity |
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pc = evt.getPhaseCavity() print "ebeam: ", beamChrg, beamEnrg, beamPosX, beamPosY, beamAngX, beamAngY, beamPkCr
try:
else :
pcFitTime1 = pc.fFitTime1
print "No EBeam object found"
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To read out the energy from the front end enclosure (FEE) gas detector, use getFeeGasDet()
. This returns and array of 4 numbers:
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pcFitTime2 = pc.fFitTime2
fee_energy_arraypcCharge1 = evtpc.getFeeGasDet()fCharge1
gdENRC11pcCharge2 = fee_energy_array[0]
pc.fCharge2
gdENRC12 = fee_energy_array[1]
gdENRC21 = fee_energy_array[2]
print "PhaseCavity: ", pcFitTime1, pcFitTime2, pcCharge1, pcCharge2
except :
gdENRC22 = fee_energy_array[3]
print "No Phase Cavity print "GasDet energy ", gdENRC11, gdENRC12, gdENRC21, gdENRC22
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To read out fit time and charge of the phase cavity, use getPhaseCavity()
which returns a structure with the following fields:
Event code
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def event(self, evt, env):
evrdata |
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pc = evt.getPhaseCavity()
if pc :getEvrData("NoDetector-0|Evr-0")
for i in pcFitTime1 = pc.fFitTime1range (evrdata.numFifoEvents()):
print "Event code: pcFitTime2 = pc.fFitTime2
pcCharge1 = pc.fCharge1
pcCharge2 = pc.fCharge2
print "PhaseCavity: ", pcFitTime1, pcFitTime2, pcCharge1, pcCharge2
else :
print "No Phase Cavity object found"
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Display images from princeton camera
When plotting with MatPlotLib, we don't need to set the limits of the histogram manually, thus we don't need to read the Princeton configuration for this. If we want to sum the image from several events, we must first define and initialize some variables:
", evrdata.fifoEvent(i).EventCode
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In the example above, the address of the EvrData object is given as "NoDetector-0|Evr-0". The address may be different in other cases, so make sure you have the correct address. If you don't know what it is, you can use 'pyxtcreader -vv <xtcfile> | less' to browse your xtcfile and look for it. Look for a lines with 'contains=EvrConfig_V' or 'contains=EvrData_V'. The address will be found on the same line in 'src=DetInfo(<address>)'
Encoder data (delay scanner)
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def event(self,evt,env):
try |
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def __init__ ( self ):
#encoder initialize data
self.address = "SxrEndstation-0|Princeton-0"
self.data = None
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In each event, we add the image array returned from the getPrincetonValue function:
= evt.get(xtc.TypeId.Type.Id_EncoderData, self.enc_source )
encoder_value = encoder.value()
except:
print "No encoder found in this event"
return
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You could combine it with phase cavity time, and compute a time delay from it, for example (I don't know the origin of these parameters!):
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# Encoder Parameters to convert to picoseconds
delay_a = -80.0e-6;
delay_b = 0.52168;
delay_c = 299792458;
delay_0 = 0;
delay_time = (delay_a * encoder_value + delay_b)*1.e-3 / delay_c)
delay_time = 2 * delay_time / 1.0e-12 + delay_0 + pcFitTime1
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Time data
The time of the event can be obtained within the event function:
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def event ( self, evt, env ) :
event_time = evt.getTime().seconds() + 1.0e-9*evt.getTime().nanoseconds() )
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IPIMB diode data
This is data from sets of 4 diodes around the beam line (Intensity Position, Intensity Monitoring Boards)
that measures the beam intensity in four spots, from which we can also deduce the position of the beam.
Currently there are two data structures that holds data from the same type of devices. Depending on DAQ
configuration, they are either DetInfo type or BldInfo type. Here are examples for extracting both types
in the user module event function:
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def event(self, evt, env):
# raw data
ipmRaw = evt.get(xtc.TypeId.Type.Id_IpimbData, source )
try:
ch = [ipmRaw.channel0(),
ipmRaw.channel1(),
ipmRaw.channel2(),
ipmRaw.channel3() ]
ch_volt = [ipmRaw.channel0Volts(),
ipmRaw.channel1Volts(),
ipmRaw.channel2Volts(),
ipmRaw.channel3Volts()]
except:
pass
# feature-extracted data
ipmFex = evt.get(xtc.TypeId.Type.Id_IpmFex, source )
try:
# array of 4 numbers
fex_channel = ipmFex.channel
# scalar values
fex_sum = ipmFex.sum
fex_xpos = ipmFex.xpos
fex_ypos = ipmFex.ypos
except:
pass
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def event(self, evt, env):
ipm = evt.getSharedIpimbValue("HFX-DG3-IMB-02")
# or equivalently:
# ipm = evt.get(xtc.TypeId.Type.Id_SharedIpimb, "HFX-DG3-IMB-02")
try:
### Raw data ###
# arrays of 4 numbers:
ch = [ipm.ipimbData.channel0(),
ipm.ipimbData.channel1(),
ipm.ipimbData.channel2(),
ipm.ipimbData.channel3()]
ch_volt = [ipm.ipimbData.channel0Volts(),
ipm.ipimbData.channel1Volts(),
ipm.ipimbData.channel2Volts(),
ipm.ipimbData.channel3Volts()]
### Feature-extracted data ###
# array of 4 numbers:
fex_channels = ipm.ipmFexData.channel
# scalars:
fex_sum = ipm.ipmFexData.sum
fex_xpos = ipm.ipmFexData.xpos
fex_ypos = ipm.ipmFexData.ypos
except:
pass
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Acqiris waveform data
This method can be used for any detector/device that has Acqiris waveform data. Edit the self.address field to get the detector of your choice.
Initialize class members:
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def __init__ ( self ):
# initialize data
self.address = "AmoITof-0|Acqiris-0"
self.data = []
self.counter = 0
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If you're curious to see any of the Acqiris configuration, e.g. how many channels do we have, you can inspect the AcqConfig object:
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def beginjob ( self, evt, env ) :
cfg = env.getConfig( _pdsdata.xtc.TypeId.Type.Id_AcqConfig, self.address )
self.num = cfg.nbrChannels()
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The read the event waveform data (an array) and append it to the self.data list:
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def event ( self, evt, env ) :
channel = 0
acqData = evt.getAcqValue( self.address, channel, env)
if acqData :
self.counter+=1
wf = acqData.waveform() # returns a waveform array of numpy.ndarray type.
self.data.append(wf)
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At the end of the job, take the average and plot it:
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def endjob( self, env ) :
data = np.array(self.data) # this is an array of shape (Nevents, nSamples)
# take the mean of all events for each sampling time
xs = np.mean(data, axis=0)
plt.plot(xs)
plt.xlabel('Seconds')
plt.ylabel('Volts')
plt.show()
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Which gives you a plot like this
Image Added
Princeton camera image
When plotting with MatPlotLib, we don't need to set the limits of the histogram manually, thus we don't need to read the Princeton configuration for this. If we want to sum the image from several events, we must first define and initialize some variables:
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def __init__ ( self ):
# initialize data
self.address = "SxrEndstation-0|Princeton-0"
self.data = None
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In each event, we add the image array returned from the getPrincetonValue function:
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title | getPrincetonValue |
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def event ( self, evt, env ) :
frame = evt.getPrincetonValue( self.address, env)
if frame :
# accumulate the data
if self.data is None :
self.data = np.float_(frame.data())
else :
self.data += frame.data()
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At the end of the job, display/save the array:
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def endjob( self, env ) :
plt.imshow( self.data/self.countpass, origin='lower')
plt.colorbar()
plt.show()
# save the full image to a png file
plt.imsave(fname="pyana_princ_image.png",arr=self.data, origin='lower')
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Note that imsave saves the image only, pixel by pixel. If you want a view of the figure itself, lower resolution, you can save it from the interactive window you get from plt.show().
Image Added
PnCCD image
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title | getPnCcdValue |
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def event(self,evt,env):
try:
frame = evt.getPnCcdValue( self.source, env )
image = frame.data()
except:
pass
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Other image (FCCD*,Opal,PIM (TM6740), ... )
These all use the generic getFrameValue function:
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title | getFrameValue |
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def event(self,evt,env):
try:
frame = evt.getFrameValue( self.source )
image = frame.data()
except:
pass
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FCCD (Fast CCD) image
The Fast CCD is read out as two 8-bit images, therefore you need this extra line to convert it to the right format.
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title | getFrameValue |
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def event(self,evt,env):
try:
frame = evt.getFrameValue( self.source )
image = frame.data()
except:
pass
# convert to 16-bit integer
image.dtype = np.uint16
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CsPad data
Here's an example of getting CsPad data from an event:
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title | getCsPadQuads |
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def event(self,evt,env):
quads = evt.getCsPadQuads(self.img_source, env)
if not quads :
print '*** cspad information is missing ***'
return
# dump information about quadrants
print "Number of quadrants: %d" % len(quads)
for q in quads:
print " Quadrant %d" % q.quad()
print " virtual_channel: %s" % q.virtual_channel()
print " lane: %s" % q.lane()
print " tid: %s" % q.tid()
print " acq_count: %s" % q.acq_count()
print " op_code: %s" % q.op_code()
print " seq_count: %s" % q.seq_count()
print " ticks: %s" % q.ticks()
print " fiducials: %s" % q.fiducials()
print " frame_type: %s" % q.frame_type()
print " sb_temp: %s" % map(q.sb_temp, range(4))
# image data as 3-dimentional array
data = q.data()
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So far so good. 'quads' is a list of CsPad Element objects, and not necessarily ordered in the expected way. So you'll need to use q.quad() to obtain the quad number.
q.data() gives you a 3D numpy array [row][col][sec]. Here sections will be ordered as expected, but be aware in case of missing sections, that you may need to check the
configuration object. You can get that from the env object, typically something you do in beginjob:
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def beginjob(self,evt,env):
config = env.getConfig(xtc.TypeId.Type.Id_CspadConfig, self.img_source)
if not config:
print '*** cspad config object is missing ***'
return
print "Cspad configuration"
print " N quadrants : %d" % config.numQuads()
print " Quad mask : %#x" % config.quadMask()
print " payloadSize : %d" % config.payloadSize()
print " badAsicMask0 : %#x" % config.badAsicMask0()
print " badAsicMask1 : %#x" % config.badAsicMask1()
print " asicMask : %#x" % config.asicMask()
print " numAsicsRead : %d" % config.numAsicsRead()
# get the indices of sections in use:
qn = range(0,config.numQuads())
self.sections = map(config.sections, qn )
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If you want to draw the whole CsPad image, there's currently no pyana function that does this. Pyana only supplies the pixels in a numpy array, and the
exact location of each pixel depends on the conditions at the time of data collection. A simplified way of making the image can be seen in cspad_simple.py(newer version (cspad.py) available if you check out the XtcExplorer package).
CSPad pixel coordinates.
The CSPad detector image can be drawn by positioning the sections from the data array into a large image array. This is done in cspad_simple.py above. The positions are extracted from optical meterology measurements and additional calibrations. Alternatively one can find the coordinate of each individual pixel from a pixel map, based on the same optical metrology measurements. This is described in details here
Epics Process Variables and ControlConfig
EPICS data is different from DAQ event data. It stores the conditions and settings of the instruments, but values typically change more slowly than your
average shot-by-shot data, and EPICS data is typically updated only when it changes, or every second, or similar. It is not stored in the 'evt' (event) object,
but in the 'env' (environment) object. You typically would read it only at the beginning of each job or if your doing a scan, you'd read it in every calibration cycle:
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title | env.epicsStore() |
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def begincalibcycle(self,evt,env):
## The returned value should be of the type epics.EpicsPvTime.
pv = env.epicsStore().value( pv_name )
if not pv: |
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def event ( self, evt, env ) :
frame = evt.getPrincetonValue( self.address, env)
if frame :
# accumulate the data
logging.warning('EPICS PV %s ifdoes self.data is None :
not exist', pv_name)
else:
self.datavalue = np.float_(frame.data())pv.value
status = elsepv.status :
self.data += frame.data()
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At the end of the job, display/save the array:
alarm_severity = pv.severity
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title | ControlConfig |
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def begincalibcycle(self,evt,env) |
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def endjob( self, env ) :
ctrl_config = pltenv.imshow( self.data/self.countpass, origin='lower')
getConfig(xtc.TypeId.Type.Id_ControlConfig)
nControls plt.colorbar= ctrl_config.npvControls()
for ic in range plt.show()(0, nControls ):
#cpv save the full image to a png file
plt.imsave(fname="pyana_princ_image.png",arr=self.data, origin='lower')
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...
= ctrl_config.pvControl(ic)
name = cpv.name()
value = cpv.value()
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