Proton Calorimetry/Experimental Runs/2021/Mar4
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. |  |
| 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. |  |
| 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. |  |
| 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. |  |
| 5 | 3, 4, 1 | board rotation and sweep covering of photodiodes |  |
| 6 | 3, 4, 1 | swept exposure of photodiodes |  |
| 7 | 3, 4, 1 | reversed swept exposure of photodiodes |  |
| 8 | 4, 3, 1 | board rotation and sweep/finger covering of photodiodes |  |
| 9 | 3, 4, 2 | board rotation and sweep covering of photodiodes |  |
| 10 | 3, 2, 4 | board rotation and sweep covering of photodiodes |  |
| 11 | 3, 1, 4, 2 | board rotation and sweep covering of photodiodes |  |
| 12 | 3, 4, 2, 1 | board rotation and sweep covering of photodiodes |  |
| 13 | 3, 2, 1, 4 | board rotation and sweep covering of photodiodes |  |