Proton Calorimetry/Experimental Runs/2022/MayLED: Difference between revisions

Revision as of 09:31, 16 May 2022

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
2	D27, CMOS on, 12.5pC
3	D27, CMOS off, 350pC
4	D27, CMOS off, 12.5pC
5	D109, CMOS on, 350pC
6	D109, CMOS on, 12.5pC
7	D109, CMOS off, 350pC
8	D109, CMOS off, 12.5pC
9	D109, CMOS on, 12.5pC. Detector housing grounded using ground pin of FPGA. Grounded using optical breadboard inside detector.
10	D109, CMOS on, 12.5pC. Previous grounding seemed ineffective. Now grounded by attaching clip to metal on outside face of detector enclosure.
11	D109, CMOS off, 12.5pC, grounded.
12	D27, CMOS off, 12.5pC, grounded.
13	D27, CMOS off, 12.5pC
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.

@@ Line 4: / Line 4: @@
 '''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.
 {|class="wikitable"
@@ Line 11: / Line 15: @@
 !Graph
 |-
-|1 || D27, CMOS on, 350pC ||
+|1 || No material dark noise test||
 <div class="image150px" style="text-align: center;">
 [http://www.hep.ucl.ac.uk/pbt/wikiData/movies/DDC232/210422/Histograms/Run001.png http://www.hep.ucl.ac.uk/pbt/wikiData/movies/DDC232/210422/Histograms/Run001.png]