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
Resistance measurement of a single quad heater:
1.9 ohms
List of Materials:
1. Using cobar core solder 63/37 (Sn64 Pb37) type with flux core or.... the type of solder makes too much difference.
The diameter of the wire needs to be small 0.012" to 0.020".
2. The solder wick is either Solder-Wick by Chemtroncs. Or Hex-Wick by Hexacon Electric Co.
3. Liquid flux for between the wick and silicon.
The liquid flux defines where the solder will flow. Don't get the flux anywhere you don't want solder.
4. Alcohol for cleaning the flux from the fixtures after the soldering. A wood toothpick and cotton swab is useful to rub off some of the remaining flux.
Also, rinse the remaining wick with alcohol as it contains dry flux and looks nicer when it's cleaned off.
5. Heaters
6. Fixture to hold heaters and fixtures
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)
This step are illustrated in the photos here (for the quad modules):
and for the single modules here:
Turn on high setting.
Attach the thermal sensor to the aluminum rectangle ( below the washer)
Place the rectangle on the hot plate - make sure the wires don't bend and the electrical tape doesn't touch the aluminum.
In 10 mins check the temperature and if ~ 250 ℃ - turn the hot plate to 3.5 and let stabilize (fluctuations of ± 2 ℃)
Clean the fixture ethanol
Lightly screw in the rectangles to the fixture
Cut the solder wick into ~8cm lengths
Set initial wire positions
Place the heater in the fixture in the right orientation (using a vacuum pen?)
Tighten the screws making sure the wires are in the right position
Clean the heaters with ethanol
Check the temperature ~ 245 ℃
Using 2 pliers place the fixture with the heaters on the hot plate
Wait ~4 mins for the fixture to come to the right temperature (it smells funky and smokes a bit)
Using the <0.02” diameter solder perform the actual soldering - be careful not to over solder
Clean up [15 mins]
Pick up the fixture with 2 pliers and place on the aluminum sheet
Wait 2 mins for the fixture to cool down
Use ethanol to clean up residue (napkins and Q-tips)
Undo the screws and rectangles
Remove the heater carefully (maybe vacuum pen will help here?) Sometimes the soldering makes the heaters stick to the fixture.
Place the heater in the wax cover and measure the resistance
Clean the fixture again to get it ready for the next heater.
Issues/Suggestions
How to avoid over soldering? Practice?
Speckles on the heaters after soldering - What are they?
Maybe some kind of support for Thanh?
How to label the heaters to record the resistance measurements? Mark the wax paper
Test 1: May 2nd (Successful) [Spare Heater 1]
Spare heaters soldered at SLAC:
1st quad heater solder job:
Resistance for the spare quad heater: 3.5 ohms
Test 2: May 13th (Successful) [Spare Heater 2]
Resistance - 3.4 ohms
Issues -
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]
same issue - Wick just came off the heater.
Test 5: May 16th (Successful) - Re-did the same heater as above. [Spare Heater 3]
Why did it work this time?
Issues - during the failed tests, the reflective side placed on the bottom was scratched.
Test 6: May 16th (Successful) [Spare Heater 4]