""" Discrete photon energy scan (vector scan) of multiple spectral regions """ PHI_RANGE = (-160.0, 160.0) # (tuple (min, max)) THETA_RANGE = (-9.0, 81.0) # (tuple (min, max)) STEPS = (40.0, 1.0) # (tuple (phi, theta)) ZIGZAG = True # scan positioner: Eph = photon energy MOTORS = (ManipulatorPhi, ManipulatorTheta) #MOTORS = [ManipulatorPhi] # comma-separated discrete list of scan positions POSITIONS = [(PHI_RANGE[0], THETA_RANGE[0]), (PHI_RANGE[1], THETA_RANGE[1]), STEPS] #POSITIONS = [-175., 180., 5.] # seconds to wait between positioning command and triggering the detector LATENCY = 0.0 # region setup # # for each region, define a python dictionary with the following items. # optional items can be left unspecified and will default to the indicated values. # for swept mode, include 'elo', 'ehi', 'estep', 'iter' values, but do not include 'efix'. # for fixed mode, include 'efix' value, but do not include 'elo', 'ehi', 'estep', 'iter'. # # 'name': user-specific name of the region (for graph title and RegionName attribute in data file) # 'elo': lower kinetic energy boundary of the spectrum # 'ehi': upper kinetic energy boundary of the spectrum # 'estep': energy step size # 'efix': center kinetic energy in fixed mode # 'epass': pass energy # 'tstep': dwell time in seconds # 'iter': number of iterations/sweeps (default 1) # 'cis': True = constant initial state (photoemission line), False = constant final state (Auger peak), (default False) # 'slit': exit slit (default current value) REGION1 = {'name': 'on-resonance', 'ephot': 1237.7, 'efix': 1222.1, 'epass': 200., 'tstep': 20., 'iter': 1, 'cis': False} REGION2 = {'name': 'off-resonance', 'ephot': 1235.0, 'efix': 1219.4, 'epass': 200., 'tstep': 20., 'iter': 1, 'cis': False} #REGION1 = {'name': 'secondary', 'elo': 9.0, 'ehi': 11.0, 'estep': 0.02, 'epass': 2, 'tstep': 0.20, 'iter': 1, 'cis': False} #REGION2 = {'name': 'fermi', 'elo': 23.5, 'ehi': 27.5, 'estep': 0.02, 'epass': 2, 'tstep': 0.35, 'iter': 1, 'cis': False} # list of region dictionaries to execute at each scan position REGIONS = [REGION1, REGION2] # close beam shutter and turn off analyser at the end of the scan CLOSE_SHUTTER_AT_END = True # --- DO NOT EDIT BELOW THIS LINE! --- def check_region(region): """ check region dictionary items and apply defaults where necessary """ region['fixed'] = 'efix' in region if region['fixed']: region['elo'] = region['efix'] region['ehi'] = region['efix'] if 'iter' not in region: region['iter'] = 1 print("region {0}: setting default iter = {1}".format(region['name'], region['iter'])) if 'cis' not in region: region['cis'] = False print("region {0}: setting default cis = {1}".format(region['name'], region['cis'])) if 'slit' not in region: region['slit'] = ExitSlit.read() print("region {0}: setting default slit = {1}".format(region['name'], region['slit'])) class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray): def initialize(self): #super(SpectrumReader, self).initialize() self.scan_index = -1 def create_datasets(self): path = get_exec_pars().scanPath + self.region_name + "/" self.channel_begin_dataset_name = path + "ScientaChannelBegin" self.channel_end_dataset_name = path + "ScientaChannelEnd" self.channel_center_dataset_name = path + "ScientaChannelCenter" self.pass_energy_dataset_name = path + "ScientaPassEnergy" self.step_energy_dataset_name = path + "ScientaStepEnergy" self.step_time_dataset_name = path + "ScientaStepTime" self.iterations_dataset_name = path + "ScientaIterations" self.slit_dataset_name = path + "ExitSlit" create_dataset(self.channel_begin_dataset_name, 'd') create_dataset(self.channel_end_dataset_name, 'd') create_dataset(self.channel_center_dataset_name, 'd') create_dataset(self.pass_energy_dataset_name, 'd') create_dataset(self.step_energy_dataset_name, 'd') create_dataset(self.step_time_dataset_name, 'd') create_dataset(self.iterations_dataset_name, 'd') create_dataset(self.slit_dataset_name, 'd') def setup(self): print("spectrum.setup") if self.scan_index != get_exec_pars().index: self.scan_index = get_exec_pars().index self.create_datasets() if self.region_index == 0: print "scan {0}".format(self.scan_index) ephot = Eph.read() try: if self.region['cis']: edelta = ephot - self.ephot_start else: edelta = 0.0 except AttributeError: self.ephot_start = ephot edelta = 0.0 elo = self.region['elo'] + edelta ehi = self.region['ehi'] + edelta if self.region['fixed']: Eph.move(self.region['ephot']) Scienta.setAcquisitionMode(ch.psi.pshell.epics.Scienta.AcquisitionMode.Fixed) Scienta.centerEnergy.write(elo) else: Eph.move(self.region['ephot']) Scienta.setAcquisitionMode(ch.psi.pshell.epics.Scienta.AcquisitionMode.Swept) Scienta.lowEnergy.write(elo) Scienta.highEnergy.write(ehi) Scienta.stepSize.write(self.region['estep']) Scienta.setPassEnergy(self.region['epass']) Scienta.stepTime.write(self.region['tstep']) Scienta.setIterations(self.region['iter']) ExitSlit.write(self.region['slit']) Scienta.update() if self.region['fixed']: append_dataset(self.channel_center_dataset_name, elo) else: append_dataset(self.channel_begin_dataset_name, elo) append_dataset(self.channel_end_dataset_name, ehi) append_dataset(self.step_energy_dataset_name, self.region['estep']) append_dataset(self.pass_energy_dataset_name, self.region['epass']) append_dataset(self.step_time_dataset_name, self.region['tstep']) append_dataset(self.iterations_dataset_name, self.region['iter']) append_dataset(self.slit_dataset_name, self.region['slit']) def read(self): print("spectrum.read") global current_region_index current_region_index = self.region_index self.setup() print("Acquiring region {0}.".format(self.region['name'])) trig_scienta() time.sleep(0.5) sp = Scienta.getSpectrum().read() return sp def getSize(self): if self.region['fixed']: nx = 992 else: nx = int((self.region['ehi'] - self.region['elo']) / self.region['estep']) + 1 return nx class ImageReader(ReadonlyRegisterBase, ReadonlyRegisterMatrix): def read(self): print("image.read") return Scienta.getDataMatrix().read() def getWidth(self): if self.region['fixed']: nx = 992 else: nx = int((self.region['ehi'] - self.region['elo']) / self.region['estep']) + 1 return nx def getHeight(self): ny = Scienta.slices.read() return ny def setup_live_plots(regions): global live_plots global current_region_index names = [region['name'] for region in regions] live_plots = plot(None, names, title="Live Spectra") current_region_index = 0 def update_live_plots(): global live_plots global current_region_index try: while get_context().state.running: y = Scienta.spectrum.take(100) x = Scienta.spectrumX try: series = live_plots[current_region_index].getSeries(0) series.setData(x, y) except IndexError: pass time.sleep(1.0) finally: print "Stopping live spectra" def do_scan(motors, positions, regions, latency): global SENSORS SENSORS = [] for (index, region) in enumerate(regions): check_region(region) reader = SpectrumReader() reader.region_index = index reader.region_name = "region{0}".format(index + 1) reader.region = region reader.initialize() set_device_alias(reader, reader.region_name + "/ScientaSpectrum") SENSORS.append(reader) image = ImageReader() image.region_index = index image.region = region image.initialize() set_device_alias(image, reader.region_name + "/ScientaImage") SENSORS.append(image) SENSORS.append(SampleCurrent) SENSORS.append(RefCurrent) adjust_sensors() set_adc_averaging() ascan(motors, SENSORS, positions[0], positions[1], positions[2], latency, False, zigzag = True, before_read=wait_beam, after_read = after_readout) #lscan(motors, SENSORS, positions[0], positions[1], positions[2], latency, False, before_read=wait_beam, after_read = after_readout) #vscan(motors, SENSORS, positions, True, latency,False, before_read=wait_beam, after_read = after_readout) for (index, region) in enumerate(regions): set_attribute(get_exec_pars().scanPath + "region{0}/ScientaSpectrum".format(index + 1), "RegionName", region['name']) set_attribute(get_exec_pars().scanPath + "region{0}/ScientaImage".format(index + 1), "RegionName", region['name']) set_attribute(get_exec_pars().scanPath, "Regions", [region['name'] for region in regions]) try: setup_live_plots(REGIONS) task = fork(update_live_plots) do_scan(MOTORS, POSITIONS, REGIONS, LATENCY) finally: if CLOSE_SHUTTER_AT_END: after_scan()