DiffractionEventCalibrateDetectors dialog.
Table of Contents
This algorithm optimizes the position and angles of all of the detector panels. The target instruments for this feature are SNAP and TOPAZ.
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| InputWorkspace | Input | EventWorkspace | Mandatory | The workspace containing the geometry to be calibrated. |
| Params | Input | string | A comma separated list of first bin boundary, width, last bin boundary. Optionally this can be followed by a comma and more widths and last boundary pairs. Use bin boundaries close to peak you wish to maximize. Negative width values indicate logarithmic binning. | |
| MaxIterations | Input | number | 10 | Stop after this number of iterations if a good fit is not found |
| LocationOfPeakToOptimize | Input | number | 2.0308 | Optimize this location of peak by moving detectors |
| DetCalFilename | Input | string | Mandatory | The output filename of the ISAW DetCal file. Allowed extensions: [‘.detcal’] |
| BankName | Input | string | Optional: To only calibrate one bank. Any bank whose name does not match the given string will have no events. |
Moves the detectors in an instrument to optimize the maximum intensity of each detector using gsl_multimin_fminimizer_nmsimplex. Only bin data close to peak you wish to maximize.
Example: move detectors to maximize intensity
import os
ws = CreateSampleWorkspace("Event",NumBanks=1,BankPixelWidth=1)
ws = MoveInstrumentComponent(Workspace='ws', ComponentName='bank1', X=0.5, RelativePosition=False)
wsD = ConvertUnits(InputWorkspace='ws', Target='dSpacing')
maxD = Max(wsD)
#Peak is at 2.69 in dSpace
DiffractionEventCalibrateDetectors(InputWorkspace='ws', Params = "2.6, 0.001, 2.8",
LocationOfPeakToOptimize=2.67, BankName="bank1", DetCalFilename="Test.DetCal")
LoadIsawDetCal(InputWorkspace='ws',Filename=os.path.join(config["defaultsave.directory"], 'Test.DetCal'))
ws = ConvertUnits(InputWorkspace='ws', Target='dSpacing')
maxA = Max(ws)
print("Peak in dSpace {:.11f}".format(0.5*(maxD.readX(0)[0]+maxD.readX(0)[1])))
print("Peak from calibration {:.11f}".format(0.5*(maxA.readX(0)[0]+maxA.readX(0)[1])))
Output:
Peak in dSpace 2.69077317913
Peak from calibration 2.68342207235
Categories: Algorithms | Diffraction\Calibration | CorrectionFunctions\InstrumentCorrections
C++ source: DiffractionEventCalibrateDetectors.cpp (last modified: 2017-10-17)
C++ header: DiffractionEventCalibrateDetectors.h (last modified: 2016-06-13)