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| sample | Label | dimension | quantity | who | date |
| Heaters single size | A19 | 21.3x20.5 | 9 | Marco | 3/21/19 |
| Heaters single size | B19 | 21.3x20.5 | 9 | Marco | 3/21/19 |
| Heaters quad size | C19 | 45x41 | 25 | Marco | 3/21/19 |
| Heaters dummies for tests (wafer edges) | D19 | 45x41 | 20 | Marco | 3/21/19 |
| Stavelets | 12-16 | (2 quad heaters per stavelet) | 5 | Marco | 2/20/19 |
Dummy Heaters Inventory (the table above is a screenshot of 3/22). The latest status is at
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Heaters dimensions have been measured here:
https://drive.google.com/drive/folders/1bW_r5Phgyt8DJJ4dwmBe-TeskERc6VYQ
Resistance measurement of a single quad heater:
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7. Hot plate (to achieve 220C)
8. Protective equipment
Cobar core solder 63/37 type with flux core
Solder-Wick by Chemtroncs (Left). Hex-Wick by Hexacon Electric Co.
List of Steps
(use photos for reference - NOTE: the "single" and "quad" modules are used interchangeably in the photos)
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This step are illustrated in the photos here (for the quad modules):
and for the single modules here:
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- Speckling on the heater surface - Remained even after cleaning the surface with Alcohol - Maybe the flux spluttering and then baking on the heater surface
- Over Soldering - We requested Tan to use lesser solder in the process. Could also be because there was a small gap between the wick and the heater surface causing the solder to flow.
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Test 3: May 14th (Not successful) [Spare Heater 3]
The wick just came off the heater without any force
Test 4: May 15th (Not successful) - Re-did the same heater as the above. [Spare Heater 3]
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Issues - during the failed tests, the reflective side placed on the bottom was scratched.
Test 6: May 16th (Successful) [Spare Heater 4]
Resistance: 3.1 ohms
Test 7: May 22nd (Successful) [Spare Heater 5]
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Test 8: May 24th (Successful) [Spare Heater 6]
Resistance: 3.5 ohms
Test 9: Jun 14th (Successful) [Spare heater 7]
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Soldering: Aidan and Sam under Thanh's supervision
Test 10: Jun 14th (Successful) [Spare heater 8]
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Old heaters were removed from stavelets to reload for radiation tests. They are different in dimension than the previous heaters. Their resistance distribution is as follows: Stavelet_heaters_Resistance_distribution.pdf
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Dummy Heater position on 19-0 Ring
for reference:
- Ring Triplet, RD53a: https://edms.cern.ch/ui/file/2363540/1/RD53A_R0_Ring_Triplet.pdf – long edge of chips is in the tangential direction.
- CAD view of 19-1 Ring with RD53a modules:
