Proton Calorimetry/Experimental Runs/2022/MayLED
Optical isolation tests using LED fibre in D27.
Aim: Investigate optimal material to use to optically isolate unpainted sheets and whether single layers of material provide sufficient isolation.
Notes
- DDC232 settings: 170us integration time and measured 10000 samples per run.
- Signal Generator settings: 0 ps delay, 500 kHz, 300 ns width, 5 ns leading edge and trailing edge, 6V high, 0V low.
- Fibres used: 25 and 29 (25 used for single injection tests).
- Sheets used: 84, 82, 81, 80, 79, 78, 77, 76, 75
- Materials tested: none, white paper (0.01 mm thick), black card (0.02 mm thick), mylar foil (0.0012 mm thick). Materials cut into 10 cm x 10 cm layers and placed in-between sheets.
| Run | Description | Graph |
|---|---|---|
| 1 | No material dark noise test, 12.5pC |
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| 2 | No material cross-talk test, 12.5pC |
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| 3 | No material light level test sheet 1, 350pC |
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| 4 | D27, CMOS off, 12.5pC |
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| 5 | D109, CMOS on, 350pC |
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| 6 | D109, CMOS on, 12.5pC |
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| 7 | D109, CMOS off, 350pC |
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| 8 | D109, CMOS off, 12.5pC |
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| 9 | D109, CMOS on, 12.5pC. Detector housing grounded using ground pin of FPGA. Grounded using optical breadboard inside detector. |
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| 10 | D109, CMOS on, 12.5pC. Previous grounding seemed ineffective. Now grounded by attaching clip to metal on outside face of detector enclosure. |
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| 11 | D109, CMOS off, 12.5pC, grounded. |
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| 12 | D27, CMOS off, 12.5pC, grounded. |
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| 13 | D27, CMOS off, 12.5pC |
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| 14 | D27, CMOS off, 12.5pC, grounded, LED. LED pulse of 1MHz, 6V height and 500ns width. Injected into single scintillator sheet coupled to photodiode 16. |
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