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Liam Perera

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DIAGNOSIS

Check the imaging stream in GDA:

The imaging stream may look like either of these two options.

image-20240715-164846.png
Info

If the stream looks like above and the frame number is updating then the camera is on but there is no beam.

  • Open the shutter

  • Check the beam selector

If the frame number is not updating:

  • Check stream is on

image-20240715-164806.png
Info

This is the imaging stream receiving the imaging beam (above).

  • Check that the sample is in the FOV

Run through this checklist if you are unsure of what the issue is

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.

Info

Note when pressing Cameras, it can sometimes open the new tab in the bottom right panel next to the Queue.

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

image-20240628-144323.png

Check the Shutter is Open

  1. If the Shutter fails to open check the issuehttps://diamondlightsource.atlassian.net/wiki/x/AQDlRg

image-20240628-144210.png

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

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.