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Liam Perera

Liam Perera

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If you cannot see your sample in the imaging stream run through this checklist.

This is the imaging field of view:

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Info

If the stream looks like this and the frame number is updating - check the shutter is open and that the beam selector is set to imaging.

image-20240715-164806.pngImage Added

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This is the imaging stream receiving the imaging beam. In this case the sample is not in the FOV.

Check that the camera stream is on. 

Info

The Frame number should be updating. If not then the imaging camera is not turned on.

  1. Turn on camera stream (1) 

    1. Press the button (labelled 1. on image below).

    2. If it is red call BL staff.

    3. If it does not respond wait for 30 seconds and try again

    4. If still does not turn on and is not red. Restart GDA [LINK]

  2. Initiate a new camera (2) 
    This should open a new window.

  3. Using stream drop down select EPICS PV Access and press connect. Once you click connect, you should see a live stream.

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Info

If the camera is on but you cannot see the beam on the camera

Check the Shutter is Open

  1. If the Shutter fails to open check this solution

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Check the beam selector is set to correct beam.

  1. The top drop-down field (user selection) and the bottom field (read back/actual beam) can become out of sync. (eg. Top says imaging but readback says diffraction).

  2. To resync - set the drop down menu to the same as the read back value and then again use the drop down menu to select the beam of choice.

image-20240628-144230.png

  1. Check that the camera stream is on. 

    1. Turn on camera stream (1) 
      The camera button should go light green (shown below). If it does not go green

    2. Initiate a new camera (2) 
      This should open a new window.

    3. Using stream drop down select EPICS PV Access and press connect. Once you click connect, you should see a live stream.

    4. If the imaging camera or pilatus does not initiate/turn on or icon goes red Call BL Staff.

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Check that the exposure time is set correctly. 

  1. If the exposure is too high, the detector will max out (65K pixel count for imaging). This is not good for either detector so stop ASAP. If it is too low then the image will appear black.

Check your sample in the correct position. 

  1. Rotate sample 180 degrees using GTS theta – the sample should appear in the view

  2. Check base-X is set to GTS position

  3. Check the sample height is correct. Use the laser as a guide.