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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. 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.EventImage Removed
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 | getFeeGasDet |
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fee_energy_array = evt.getFeeGasDet()
gdENRC11 = fee_energy_array[0]
gdENRC12 = fee_energy_array[1]
gdENRC21 = fee_energy_array[2]
gdENRC22 = fee_energy_array[3]
energy = (gdENRC21 -+ gdENRC22) / 2.0
# or use the first two that has a different gain:
energy = (gdENRC11 -+ gdENRC12) / 2.0
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BeamLine Data: Phase Cavity
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title | getPhaseCavity |
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pc = evt.getPhaseCavity()
try:
pcFitTime1 = pc.fFitTime1
pcFitTime2 = pc.fFitTime2
pcCharge1 = pc.fCharge1
pcCharge2 = pc.fCharge2
print "PhaseCavity: ", pcFitTime1, pcFitTime2, pcCharge1, pcCharge2
except :
print "No Phase Cavity object found"
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Event code
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title | EncoderDataEnvData |
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def event(self, evt, env):
evrdata try:
= evt.getEvrData("NoDetector-0|Evr-0")
for i encoderin =range evt(evrdata.get(xtc.TypeId.Type.Id_EncoderData, self.enc_source )numFifoEvents()):
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
print "Event code: ", 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:
encoder = 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!)
Time data
The time of the event can be obtained within the event function:
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def event ( self, evt,# envEncoder )Parameters :
to convert to picoseconds
event delay_timea = 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.
-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 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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title | DetInfogetTime |
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def event ( self, evt, env ) :
# raw data
ipmRaw 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:get(xtc.TypeId.Type.Id_IpimbData, source )
try:
ch = [ipmRaw.channel0(),
ipmRaw.channel1(),
ipmRaw.channel2(),
ipmRaw.channel3() ]
ch_volt = [ipmRaw.channel0Voltschannel0(),
ipmRaw.channel1VoltsipmRaw.channel1(),
ipmRaw.channel2Voltschannel2(),
ipmRaw.channel3Voltschannel3() ]
except:
pass
# feature-extracted data
ipmFexch_volt = evt[ipmRaw.get(xtc.TypeId.Type.Id_IpmFex, source )
channel0Volts(),
try:
# array of 4 numbers
ipmRaw.channel1Volts(),
fex_channel = ipmFex.channel
# scalar valuesipmRaw.channel2Volts(),
fex_sum = ipmFex.sum
ipmRaw.channel3Volts()]
fex_xpos = ipmFex.xposexcept:
fex_ypos = ipmFex.ypospass
except:# feature-extracted data
ipmFex pass
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title | BldInfo |
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def event(self, evt, env)= evt.get(xtc.TypeId.Type.Id_IpmFex, source )
try:
ipm = evt.getSharedIpimbValue("HFX-DG3-IMB-02")
# #array of or4 equivalently:numbers
# ipm fex_channel = evt.get(xtc.TypeId.Type.Id_SharedIpimb, "HFX-DG3-IMB-02")
try: ipmFex.channel
### Raw# datascalar ###values
# arraysfex_sum of= 4ipmFex.sum numbers:
ch fex_xpos = [ipm.ipimbData.channel0(),ipmFex.xpos
fex_ypos = ipmFex.ypos
ipm.ipimbData.channel1(), except:
pass
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def event(self, evt, env):
ipm.ipimbData.channel2(), = evt.getSharedIpimbValue("HFX-DG3-IMB-02")
# or equivalently:
# ipm = ipm.ipimbData.channel3()]evt.get(xtc.TypeId.Type.Id_SharedIpimb, "HFX-DG3-IMB-02")
ch_volt = [^cspad_simple.py]
try:
### Feature-extractedRaw data ###
# arrayarrays of 4 numbers:
fex_channelsch = [ipm.ipmFexData.channel ipimbData.channel0(),
ipm.ipimbData.channel1(),
# scalars:
fex_sum = ipm.ipmFexData.sum
ipimbData.channel2(),
fex_xpos = ipm.ipmFexData.xposipimbData.channel3()]
fexch_yposvolt = [ipm.ipmFexData.ypos
ipimbData.channel0Volts(),
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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none | none |
ipm.ipimbData.channel1Volts(),
def __init__ ( self ):
# initialize data ipm.ipimbData.channel2Volts(),
self.address = "AmoITof-0|Acqiris-0"
self.data = []ipm.ipimbData.channel3Volts()]
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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### Feature-extracted data ###
def beginjob ( self,# evt,array envof )4 numbers:
cfgfex_channels = env.getConfig( _pdsdata.xtc.TypeId.Type.Id_AcqConfig, self.address )ipm.ipmFexData.channel
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 ) # scalars:
channelfex_sum = ipm.ipmFexData.sum 0
acqDatafex_xpos = evt.getAcqValue( self.address, channel, env)ipm.ipmFexData.xpos
iffex_ypos acqData := ipm.ipmFexData.ypos
self.counter+=1except:
wf = acqData.waveform() # returns a waveform array of numpy.ndarray type.
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.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 ) :
address = "AmoITof-0|Acqiris-0"
self.data = np.array(self.data)[]
# this is an array of shape (Nevents, nSamples)
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, takeenv the mean of all events for each sampling time
xs = np.mean(data, axis=0)
) :
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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plt.plot(xs)
def event ( plt.xlabel('Seconds')self, evt, env ) :
channel = 0
plt.ylabel('Volts'acqData = evt.getAcqValue( self.address, channel, env)
plt.show()
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Which gives you a plot like this
Image Removed
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"
if acqData :
self.counter+=1
wf = acqData.waveform() # returns a waveform array of numpy.ndarray type.
self.data = None
.append(wf)
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At the end of the job, take the average and plot itIn each event, we add the image array returned from the getPrincetonValue function:
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title | getPrincetonValue |
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def event endjob( self, evt, env ) :
frame data = evtnp.getPrincetonValuearray( self.address, envdata)
# this is an array if frame :of shape (Nevents, nSamples)
# accumulatetake the data
mean of all events for each sampling time
if self.data is None :
xs = np.mean(data, axis=0)
self.data = np.float_(frame.data())plt.plot(xs)
else :plt.xlabel('Seconds')
plt.ylabel('Volts')
self.data += frame.data plt.show()
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At the end of the job, display/save the array:
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 endjob( self, env ) __init__ ( self ):
plt.imshow( self.data/self.countpass, origin='lower')# initialize data
plt.colorbar()
plt.show()
self.address = "SxrEndstation-0|Princeton-0"
#self.data save the full image to a png file= 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 = pltevt.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 Removed
PnCCD image
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title | getPnCcdValue |
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def event(self,evt,env):
trygetPrincetonValue( self.address, env)
if frame :
frame = evt.getPnCcdValue( self.source, env ) # accumulate the data
if self.data is None :
image self.data = np.float_(frame.data())
except else :
pass
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Other image (FCCD*,Opal,PIM (TM6740), ... )
These all use the generic getFrameValue function:
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 ) |
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none | none |
title | getFrameValue |
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def event(self,evt,env):
try:
frame = evt.getFrameValueplt.imshow( self.source )data/self.countpass, origin='lower')
plt.colorbar()
image = frameplt.datashow()
except: # save the full image to a png file
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.
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 | getFrameValuegetPnCcdValue |
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def event(self,evt,env):
try:
frame = evt.getFrameValuegetPnCcdValue( 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):
# converttry:
to 16-bit integer
image.dtype frame = 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):evt.getFrameValue( self.source )
quads image = evtframe.getCsPadQuads(self.img_source, envdata()
if not quads except:
print '*** cspad information is missing ***'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:
return
frame = evt.getFrameValue(
# dump information about quadrants
self.source )
printimage "Number of quadrants: %d" % len(quads= frame.data()
except:
for q in quads:pass
# convert to 16-bit printinteger
" Quadrant 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):%d" % q.quad()
quads = evt.getCsPadQuads(self.img_source, env)
print " if not quads virtual_channel:
%s" % q.virtual_channel()
print '*** cspad information is missing print***'
" lane: %s" % q.lane()return
print
" # tid:dump %s"information % q.tid()about quadrants
print "Number of acq_countquadrants: %s%d" % q.acq_countlen(quads)
print "for q in quads:
op_code: %sprint " Quadrant %d" % q.op_codequad()
print " seqvirtual_countchannel: %s" % q.seqvirtual_countchannel()
print " tickslane: %s" % q.tickslane()
print " fiducialstid: %s" % q.fiducialstid()
print " frameacq_typecount: %s" % q.frameacq_typecount()
print " sbop_tempcode: %s" % map(q.sb_temp, range(4)op_code()
print "
seq_count: %s" % q.seq_count()
# image data as 3-dimentional array
print " ticks: %s" % q.ticks()
data =print " fiducials: %s" % q.data()
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 expectedSo 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 arrayrowcolsec. 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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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 XtcExplorer/src/cspad.py or in cspad_simple.pyin 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:
logging.warning('EPICS PV %s does not exist', pv_name)
else:
value = pv.value
status = pv.status
alarm_severity = pv.severity
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title | ControlConfig |
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def begincalibcycle(self,evt,env):
ctrl_config = env.getConfig(xtc.TypeId.Type.Id_ControlConfig)
nControls = ctrl_config.npvControls()
for ic in range (0, nControls ):
cpv = ctrl_config.pvControl(ic)
name = cpv.name()
value = cpv.value()
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