6.4

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Exercises

Exercise 1

  • Load SXD23767.raw into Mantid
  • Open the Instrument View
  • Make sure the colour map is set to “jet” and the display type to “Spherical Z”.
  • Change the colour scale to SymmetricLog10 set the scale range to be between 100 and 5e4 (5e4 is equivalent to 50000)
  • Go to the Pick tab, choose Add single crystal peak PickTabAddPeakButton.png go to a Bragg peak and left-click. The mini-plot should now be showing a plot of counts vs TOF for that detector.
  • Move the mouse over the mini-plot, right-click the mouse and select Save plot to workspace, plot the workspace called Curves which should now be in the Workbench main window Workspace Toolbox.
  • Go back to the Instrument View, and the same mini-plot. This time left-click on a peak in the mini-plot to select it. A new peak should be shown in the instrument view. A workspace (PeaksWorkspace) called SingleCrystalPeakTable should also exist now in the Workspace Toolbox.
MBC_PickDemo.png
  • Double click the new PeaksWorkspace to open it as a table and verify that the TOF value is the same as shown in the mini-plot and the detector ID is the same as shown in the text area above the mini plot [Tip: click and drag in the mini-plot to zoom in!]
  • Now in the Instrument View window use the Erase single crystal peak(s) PickTabEraseButton.png tool to remove the Peak just added

Exercise 2

Here we are going to mask out the beam stop and the edge of the main detector for a small angle dataset.

  1. Load LOQ48097 data set.

  2. Open the Instrument View by right-clicking on the workspace and selecting Show Instrument.

  3. Display Full 3D on Render tab.

  4. Change the Axis view to Z+ (to avoid having a view with the front LOQ detector in front of the main detector)

  5. Make sure that the colour map axis has the SymmetricLog10 scaling.

  6. Set the Scale limits to 1 and 2378 (the max is the default). The instrument display should look like this:

    LOQForMasking.png

  7. Switch to the Draw tab.

  8. Select the ellipse drawing button PickTabEllipseButton.png.

  9. Draw an ellipse in the middle of the panel to cover completely the blue disk there. [Tip: Set the Instrument View window to full screen to make this easier!]

    LOQEllipseMasking.png

  10. Select the button for drawing a rectangular ring PickTabRectRingButton.png

  11. Draw a ring masking the edge detectors of the panel. Use its control points to adjust it to the right size and thickness.

    LOQRectRingMasking.png

  12. Click ApplyToViewButton.png button.

    LOQAppliedMask.png

  13. Click Apply and Save button and select “As Detector Mask to workspace”. A workspace named “MaskWorkspace” is created.

  14. Click ClearAllButton.png button. The instrument image returns to the original, all masking is removed.

  15. Right-click on “MaskWorkspace” and select Show Instrument.

  16. Change to Full 3D, Z+. The image should look something like this:

    MaskWorkspaceView.png