Proton Calorimetry/Experimental Runs/2022/MayLED

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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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