def test_minimal_inputs(self):
in_ws = Load('INTER00013460.nxs', OutputWorkspace="13460")
trans1 = Load('INTER00013463.nxs', OutputWorkspace="trans1")
inst = trans1.getInstrument()
out_ws, out_wsl_lam, thetafinal = ReflectometryReductionOneAuto(InputWorkspace=in_ws, AnalysisMode="PointDetectorAnalysis"
,OutputWorkspace="InQ", OutputWorkspaceWavelength="InLam")
history = out_ws.getHistory()
alg = history.lastAlgorithm()
'''
Here we are checking that the applied values (passed to CreateTransmissionWorkspace come from the instrument parameters.
'''
self.assertEqual(inst.getNumberParameter("LambdaMin")[0], alg.getProperty("WavelengthMin").value)
self.assertEqual(inst.getNumberParameter("LambdaMax")[0], alg.getProperty("WavelengthMax").value)
self.assertEqual(inst.getNumberParameter("MonitorBackgroundMin")[0], alg.getProperty("MonitorBackgroundWavelengthMin").value)
self.assertEqual(inst.getNumberParameter("MonitorBackgroundMax")[0], alg.getProperty("MonitorBackgroundWavelengthMax").value)
self.assertEqual(inst.getNumberParameter("MonitorIntegralMin")[0], alg.getProperty("MonitorIntegrationWavelengthMin").value)
self.assertEqual(inst.getNumberParameter("MonitorIntegralMax")[0], alg.getProperty("MonitorIntegrationWavelengthMax").value)
self.assertEqual(inst.getNumberParameter("I0MonitorIndex")[0], alg.getProperty("I0MonitorIndex").value)
self.assertEqual(inst.getNumberParameter("PointDetectorStart")[0], float(alg.getProperty("ProcessingInstructions").value.split(',')[0]))
self.assertEqual(inst.getNumberParameter("PointDetectorStop")[0], float(alg.getProperty("ProcessingInstructions").value.split(',')[1]))
DeleteWorkspace(in_ws)
DeleteWorkspace(trans1)
def beam_center_gravitational_drop(beam_center_file, sdd=1.13):
'''
This method is used for correcting for gravitational drop
@param beam_center_file :: file where the beam center was found
@param sdd :: sample detector distance to apply the beam center
'''
def calculate_neutron_drop(path_length, wavelength):
'''
Calculate the gravitational drop of the neutrons
path_length in meters
wavelength in Angstrom
'''
wavelength *= 1e-10
neutron_mass = 1.674927211e-27
gravity = 9.80665
h_planck = 6.62606896e-34
l_2 = (gravity * neutron_mass**2 / (2.0 * h_planck**2 )) * path_length**2
return wavelength**2 * l_2
# Get beam center used in the previous reduction
pm = mantid.PropertyManagerDataService[ReductionSingleton().property_manager]
beam_center_x = pm['LatestBeamCenterX'].value
beam_center_y = pm['LatestBeamCenterY'].value
Logger("CommandInterface").information("Beam Center before: [%.2f, %.2f] pixels" % (beam_center_x, beam_center_y))
try:
# check if the workspace still exists
wsname = "__beam_finder_" + os.path.splitext(beam_center_file)[0]
ws = mantid.mtd[wsname]
Logger("CommandInterface").debug("Using Workspace: %s." % (wsname))
except KeyError:
# Let's try loading the file. For some reason the beamcenter ws is not there...
try:
ws = Load(beam_center_file)
Logger("CommandInterface").debug("Using filename %s." % (beam_center_file))
except IOError:
Logger("CommandInterface").error("Cannot read input file %s." % beam_center_file)
return
i = ws.getInstrument()
y_pixel_size_mm = i.getNumberParameter('y-pixel-size')[0]
Logger("CommandInterface").debug("Y Pixel size = %.2f mm" % y_pixel_size_mm)
y_pixel_size = y_pixel_size_mm * 1e-3 # In meters
distance_detector1 = i.getComponentByName("detector1").getPos()[2]
path_length = distance_detector1 - sdd
Logger("CommandInterface").debug("SDD detector1 = %.3f meters. SDD for wing = %.3f meters." % (distance_detector1, sdd))
Logger("CommandInterface").debug("Path length for gravitational drop = %.3f meters." % (path_length))
r = ws.run()
wavelength = r.getProperty("wavelength").value
Logger("CommandInterface").debug("Wavelength = %.2f A." % (wavelength))
drop = calculate_neutron_drop(path_length, wavelength)
Logger("CommandInterface").debug("Gravitational drop = %.6f meters." % (drop))
# 1 pixel -> y_pixel_size
# x pixel -> drop
drop_in_pixels = drop / y_pixel_size
new_beam_center_y = beam_center_y + drop_in_pixels
Logger("CommandInterface").information("Beam Center after: [%.2f, %.2f] pixels" % (beam_center_x, new_beam_center_y))
return beam_center_x, new_beam_center_y
def beam_center_gravitational_drop(beam_center_file, sdd=1.13):
'''
This method is used for correcting for gravitational drop
@param beam_center_file :: file where the beam center was found
@param sdd :: sample detector distance to apply the beam center
'''
def calculate_neutron_drop(path_length, wavelength):
'''
Calculate the gravitational drop of the neutrons
path_length in meters
wavelength in Angstrom
'''
wavelength *= 1e-10
neutron_mass = 1.674927211e-27
gravity = 9.80665
h_planck = 6.62606896e-34
l_2 = (gravity * neutron_mass**2 / (2.0 * h_planck**2 )) * path_length**2
return wavelength**2 * l_2
# Get beam center used in the previous reduction
pm = mantid.PropertyManagerDataService[ReductionSingleton().property_manager]
beam_center_x = pm['LatestBeamCenterX'].value
beam_center_y = pm['LatestBeamCenterY'].value
Logger("CommandInterface").information("Beam Center before: [%.2f, %.2f] pixels" % (beam_center_x, beam_center_y))
try:
# check if the workspace still exists
wsname = "__beam_finder_" + os.path.splitext(beam_center_file)[0]
ws = mantid.mtd[wsname]
Logger("CommandInterface").debug("Using Workspace: %s." % (wsname))
except KeyError:
# Let's try loading the file. For some reason the beamcenter ws is not there...
try:
ws = Load(beam_center_file)
Logger("CommandInterface").debug("Using filename %s." % (beam_center_file))
except IOError:
Logger("CommandInterface").error("Cannot read input file %s." % beam_center_file)
return
i = ws.getInstrument()
y_pixel_size_mm = i.getNumberParameter('y-pixel-size')[0]
Logger("CommandInterface").debug("Y Pixel size = %.2f mm" % y_pixel_size_mm)
y_pixel_size = y_pixel_size_mm * 1e-3 # In meters
distance_detector1 = i.getComponentByName("detector1").getPos()[2]
path_length = distance_detector1 - sdd
Logger("CommandInterface").debug("SDD detector1 = %.3f meters. SDD for wing = %.3f meters." % (distance_detector1, sdd))
Logger("CommandInterface").debug("Path length for gravitational drop = %.3f meters." % (path_length))
r = ws.run()
wavelength = r.getProperty("wavelength").value
Logger("CommandInterface").debug("Wavelength = %.2f A." % (wavelength))
drop = calculate_neutron_drop(path_length, wavelength)
Logger("CommandInterface").debug("Gravitational drop = %.6f meters." % (drop))
# 1 pixel -> y_pixel_size
# x pixel -> drop
drop_in_pixels = drop / y_pixel_size
new_beam_center_y = beam_center_y + drop_in_pixels
Logger("CommandInterface").information("Beam Center after: [%.2f, %.2f] pixels" % (beam_center_x, new_beam_center_y))
return beam_center_x, new_beam_center_y
def calculate_ei(input_file):
# Auto Find Eis by finding maximum data point in m2 (excluding end points)
# and looking for neighbouring reps according to Fermi speed
# Doesn't deal with cases where the peaks enter the 2nd frame (i.e 2 meV on MARI)
print(input_file)
w1 = Load(input_file)
mon = LoadNexusMonitors(input_file)
run = w1.getRun()
# set up ==================================================
monitor_spectra_2 = 41475
monitor_spectra_3 = 41476
monitor_index_2 = 2
monitor_index_3 = 3
log = 'Fermi_Speed'
# Get instrument parameters ===============================
inst = w1.getInstrument()
source = inst.getSource()
L_m2 = mon.getDetector(monitor_index_2).getDistance(source)
L_m3 = mon.getDetector(monitor_index_3).getDistance(source)
L_Fermi = inst.getComponentByName("chopper-position").getDistance(source)
freq = run.getLogData(log).value[-1]
period = L_m2 / L_Fermi * 1.e6 / freq / 2. # include pi-pulses
# Find maximum value and identify strongest rep ===========
m2spec = ExtractSingleSpectrum(mon,monitor_index_2)
m2spec = Rebin(m2spec,"200,2,18000")
maxm2 = Max(m2spec)
TOF = maxm2.readX(0)[0]
# Generate list of possible reps in m2 ====================
irep = -5
while True:
t = TOF + irep*period
if t > 0:
ireps = numpy.array(range(irep,irep+20))
reps = TOF + period * ireps
break
else:
irep += 1
# exclude all reps that go past the frame in m3 ===========
reps_m3 = reps * L_m3 / L_m2
reps_m3 = [x for x in reps_m3 if x < 19999.]
reps = reps[0:len(reps_m3)]
# exclude all reps at short times
reps = [x for x in reps if x > 200.]
# try GetEi for the reps ==================================
Ei = []
TOF = []
for t in reps:
v_i = L_m2 / t # m/mus
Ei_guess = 5.227e6 * v_i**2 # meV
try:
(En,TOF2,dummy,tzero) = GetEi(mon, monitor_spectra_2, monitor_spectra_3, Ei_guess)
except:
continue
if abs(t - TOF2) > 20. or abs(tzero) > 100.: continue
Ei.append(Ei_guess)
TOF.append(TOF2)
#=========================================================
for ii in range(len(Ei)):
print("%f meV at TOF = %f mus" % (Ei[ii],TOF[ii]))
return Ei
