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GDA is provides a user interface to the beamline for data acquisition.

Start GDA by typing the following in a user workstation:

Code Block
gda client

The following window will initiate momentarily.

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SETUP PANEL

Purpose: Set up and optimise collection and sample centering.

  1. Experiment name – This is an ID under which all scans will be grouped. Experiment must be started to collect data.

  1. Acquisition Type – Diffraction or Imaging

  1. Beam Selector – Diffraction or Imaging

  1. EH Shutter – Open/Closed

  1. GTS Positions.

Left box is set value in mm, right box is step value in mm (can be changed). Motion is stepped using up/down arrows.

  1. Cameras
    Exposure time is optimised here. Camera streams are turned on using green button. Bright green is on. Red means fault.
    Imaging Camera – 0.001 to 1.9 sec
    Diffraction Camera – 1-60 seconds.
    image-20240716-104244.png IMPORTANT – if changing diffraction camera exposure time – turn off monitor before making the change.

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CAMERA STREAMS

Purpose: to display a live camera stream (diffraction or imaging)

Imaging:

  1. Default stream tab is a jpeg stream – do not use this for centering/optimising exposure.

  2. Click cameras button in Setup panel and this will open a new ‘Camera Configuration’ Tab.
    Note: when pressing Cameras button – new stream tab can open elsewhere

  3. Set detector to imaging or diffraction camera and stream to Epics PV Access.

  4. If shutter is open and camera is on this should produce live stream of sample.

  5. A histogram is available to aid understanding.

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SCAN CONFIGURATION: TOMOGRAPHY

Purpose: Set up scan recipes. Once saved these can be re-run at any point for any sample/experiment.

Diffraction

  1. Name: eg Diffraction_Spot

  1. Acquisitions: Diffraction, Point and Shoot, Diffraction Tomography, Beam Selector.

  1. Geometry:

1.

    1. Point, Line or Grid or use draw tool.

2.

    1. X,Y Positions in pixels

3.

    1. Number of points (if line or grid)

  2. Step/Continuous: Beam movement between scans. Usually always stepped.

  1. Alternating – speeds up collection if doing grid – but make note for correlating scan no with image.

  1. Exposure: in seconds. 1-30 seconds

  1. Post processing: Configure to dawn post processing.

  1. Saved Definitions: Scans that are saved will be found here. Simply select the scan, the parameters will load into panel and then click run to submit the scan.

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THE JOB QUEUE

Purpose: reports status of job queue including past and ongoing scans. Returns error messages if scan fails.

Stop job

Rerun Job n times

Errors

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