2024/11/01 (Friday)
- Lab in-personnel: Luke, Himangshu
| Status | Run 82 In Preparation |
|---|---|
| 1136 | Pump out contaminants from cold trap 1 |
| Pumping out contaminants from cold trap 1 | |
|---|---|
| Pre-Checks | |
| Cold trap 1 is at room temp (outside of the cold canister) | |
| (G1) is at zero | |
| (6) (8) and (9) are closed | |
| Valves (cold trap IN and OUT) on back of GHS1 are open | |
| Scroll pump is connected to He4 line in pump room | |
| Procedure | |
| 1 | Turn on scroll pump (plug to wall) |
| 2 | Open scroll pump valve by starting slowly and go all the way |
| 3 | Open (5a) → (2a) → (4) |
| 4 | Close (4) |
| 5 | Open (3) → (15) |
| 6 | Read (G1), expected reading 50-300 mbar, depending on volume of contaminants removed during prior cleaning |
| 7 | Open (4) |
| 8 | Monitor (P2) until it reads less than 1 mbar |
| 9 | Close (15) → (3) → (4) → (2a) → (5a) |
| 10 | Close scroll pump valve by turning all the way |
| 11 | Turn off scroll pump (unplug from wall) |
| 12 | Place cold trap into cold canister |
| 13 | Fill cold canister (until it spills out) |
| Connecting He3 Pump to Cold Trap | |
|---|---|
| Pre Checks | |
| (4) is closed | |
| Cold canister is filled, cold trap is submerged | |
| Procedure | |
| 1 | Slowly Open (9) → (8) → (3) → (5) |
| 2 | Turn on He3 pump (switch ↑) |
| 3 | Open (6) |
| 4 | Close (9) → (8) |
| Monitoring for flow rate during cold cleaning | |
|---|---|
| Procedure | |
| The (G2) reading should increase when (8) is closed, but it shouldn't increase when it is in the open | |
| If there's no increase in (G2) reading when (8) is closed, slightly turn (2) {the big red knob}, while tapping the glass on (G2) to get updated readings | |
| Monitor continuously during cold cleaning process for 1 hour | |
| Ending the cold cleaning process | |
|---|---|
| Procedure | |
| 1 | Open (9) |
| 2 | Close (6) → (8) |
| 3 | Monitor (P1) until ≈ 100mTorr (Open 2 almost 360 degrees) |
| 4 | Close (3) → (5) → (2) → (9) |
| 5 | Turn off (↓) He3 pump switch |
| 6 | Remove cold trap from cold canister and replace with rubber plug |