Proton Calorimetry/Experimental Runs/2021/Mar4

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[http://www.hep.ucl.ac.uk/pbt/wikiData/movies/DDC232/210304/Run06.mp4 http://www.hep.ucl.ac.uk/pbt/wikiData/movies/DDC232/210304/Thumbnails/Run06.png]</div>
[http://www.hep.ucl.ac.uk/pbt/wikiData/movies/DDC232/210304/Run06.mp4 http://www.hep.ucl.ac.uk/pbt/wikiData/movies/DDC232/210304/Thumbnails/Run06.png]</div>
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Revision as of 14:25, 5 March 2021

Daisy chain tests of second DDC232 prototype in D109

Aim: Debug "mirroring" issues when daisy-chaining more than 2 DDC232s boards.

Notes

  • DDC232 boards have a numerical identifier:
    • Board 1: S1337-16BR photodiodes
    • Board 2: 1k ohm resistors
    • Board 3: S1227-16BQ photodiodes
    • Board 4: S12915-16R photodiodes
  • In the runs listed, boards are listed right to left, with the right-most board connected to the FPGA.
  • In all runs, an integration time of 170us and full-scale range of 350pC is used.

Videos and thumbnails saved in /unix/www/html/pbt/wikiData/movies/DDC232/210304

Run Board Configuration Description Thumbnail
1 3, 1 Rotation of boards followed by swept covering of a few photodiodes in turn with black cloth. Boards initially facing downwards but rotated upwards to expose to room lighting. Sweep begins around 20s mark. Note that there is no mirroring and both boards behave as expected.
Run01.png
2 3, 4 Rotation of boards followed by swept covering of a few photodiodes in turn with black cloth. Boards initially facing downwards but rotated upwards to expose to room lighting. Sweep begins around 10s mark. Note similar behaviour to above.
Run02.png
3 3, 2 Rotation of boards followed by swept covering of a few photodiodes in turn with black cloth. Boards initially facing downwards but rotated upwards to expose to room lighting. Sweep begins around 5s mark. Note that channels 1-16 show no output as they have been replaced with resistors; also, there is no mirroring.
Run03.png
4 3, 1, 4 Rotation of boards followed by swept covering of a few photodiodes in turn with black cloth. Boards initially facing downwards but rotated upwards to expose to room lighting: boards rotated repeatedly to examine signal dropouts on board 4. Sweep begins around 47s mark. Note that the mirroring is the lowest of the photodiode pairs on boards 1 and 4. Note also that very noisy signals and signal dropouts are seen on board 4 (photodiodes 1-16) and that this is not replicated on board 1; so whatever is causing this noisy behaviour does not contribute to the mirroring. Compare this to run 2 above where these noisy signals and dropouts are not seen.
Run04.png
5 3, 4, 1 Rotation of boards followed by swept covering of a few photodiodes in turn with black cloth. Reording of boards from run 4 above. Boards initially facing downwards but rotated upwards to expose to room lighting. Sweep begins around 25s mark. Note that the behaviour is similar to run 4 with board 4 still noisy and that this noise is not mirrored but that the low signals are mirrored between boards 1 and 4.
Run05.png
6 3, 4, 1 Swept uncovering of each photodiode in turn. Sweep begins near the start of the video but it only seen in the signals once board 1 is fully uncovered and board 4 starts to be uncovered. Mirroring appears to be connected to lowest output, not largest, for mirrored pairs.
Run06.png
7 3, 4, 1 reversed swept exposure of photodiodes
Run07.png
8 4, 3, 1 board rotation and sweep/finger covering of photodiodes
Run08.png
9 3, 4, 2 board rotation and sweep covering of photodiodes
Run09.png
10 3, 2, 4 board rotation and sweep covering of photodiodes
Run10.png
11 3, 1, 4, 2 board rotation and sweep covering of photodiodes
Run11.png
12 3, 4, 2, 1 board rotation and sweep covering of photodiodes
Run12.png
13 3, 2, 1, 4 board rotation and sweep covering of photodiodes
Run13.png
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