| 1035 | G3 (main bath) pressure begins to fall, was above 500 mbar rel, now falling below 300 mbar rel. LN2 blowout nearly over probably. Sorb temperature begins to increase. |
| 1040 | Begin cryocleaning mixture through Trap 2 with v6 at 12.8% |
| 1050 | Reconnect turbo station pumping bellows to IVC port. Pump out lines first with scroll pump then with turbo pump. |
| 1050 | MC temperature starts to decrease slightly |
| 1100 | MC(Cernox) = 77.4 K, Sorb = 120 K |
| 1105 | Stop turbopumping line to IVC, open IVC valves to gauge. IVC = 1.2 mbar (He exchange gas) |
| 1115 | DIB1 electrical checkout OK except Q bias - QET resistance too high, 0.1 nS, should be 25 nS. This is true for qI and qO, which is extra strange. Confirmed by the fact that leakage to chassis is 0.7 nS for QETs but only 0.1 nS for Q bias lines. Between qI bias and qO bias it's 10 nS - don't understand. |
| 1120 | Stop pressurizing MB (close wall He valve and vent speedivalve). It may be finished - only cold gas coming out, though hose is still stiff. |
| 1125 | Try pumping on MB with scroll pump. After 10 minutes pressure on P2 is only down to 90 mbar so probably there is still LN2 in the MB. MC and Sorb temperatures are falling a bit probably from evaporative cooling. |
| 1140 | Push transfer tube down a bit, was probably not in contact with funnel |
| 1145 | Begin blowing out LN2 again. G3(MB) goes to 560 mbar, adjust He cylinder regulator valve to bring it down to 410 mbar. Definitely more LN2 coming out, fills one bomb Dewar |
| 1155 | G3(MB) pressure falls to 150 mbar rel. Hose seems less stiff. |
| 1200 | DIB2 checkout. Again Qbias-QET resistance too high, 1 nS for qI, 0.4 nS for qO. qI-qO is 10 nS which is more promising, but confusing. Another problem: leakage from qI FET to chassis. qI Feedback/Drain/Source to Chassis are 17nS/10MΩ/10MΩ. |
| 1210 | Stop pressurizing MB, try pumping out MB with scroll pump. Looks better. p2 falls below 1 mbar after 8 minutes. |
| 1230 | Fill MB with He gas to 300 mbar rel on G3. Also open 1K Pot speedivalve to fill pot with He gas, then close it again. Use scroll pump to pump out GHS auxiliary right-side manifold and GHS vent manifold with v2a and v5a open (v4a closed, vent speedivalve closed). Also pump out auxiliary left-side manifold (G3 volume) with v1a closed, v4a open. |
| 1245 | Stop cryocleaning, pump mix to dump. Dump pressure (G2) = 784.6 mbar |
| 1310 | MC(Cernox) = 78.4 K, Sorb = 144 K |
| 1315 | Perform throughput test using 2016 Jun 1 procedure. Looks bad; G1 drops to 37 mbar (with G2=613 mbar) then doesn't budge. |
| 1320 | Throughput < 0.1 mbar/minute. Looks like a blockage, god-damn it. |
| 1330 | Pump fridge contents to dump. Pump Trap 1 contents to dump. |
| 1335 | DIB3 checkout looks fine. |
| 1350 | Try a forward throughput test. Open condenser and still valves, then open v13a, v12a, v1. Look for change in P1. No change, stuck at 0.007 mbar. |
| 1400 | Pump all mix to dump |
| 1410 | Try another throughput test using old procedure. No dice. G1 falls to 40.8 mbar with G2 at 651 mbar. G1 does not increase. Pump mixture back to dump. |
| 1425 | Dump pressure (G2) = 789.1 mbar. (Higher now?) |
| 1425 | MC(Cernox) = 82.1 K, Sorb = 149 K, IVC = 1.2 mbar |
| 1430 | Fill LN2 cold trap bath. Both traps are in bath. |
| 1430 | Open v9 and v13a and v13b to leave mixture exposed to traps overnight. |