| 0832 | MC (Cernox) at 79.4 K. Still 74.96 K (2.29 kΩ). CP/Tower/H35/MCsensor = 2.3149/1.0301/2.2719/-2.2553 kΩ. |
| 0832 | IVC pumping pressure 4.0e-6 mbar, IVC pressure 1.0e-4 mbar |
| 0834 | Fill LN cold trap Dewar |
| 0853 | with v9 open (and He3 pump on), G2 = 798.4 mbar. Barometric pressure 29.99 “Hg → Dump pressure = 800.8 mbar. |
| 0858 | Start cryocleaning mixture through Trap 2. V6 open to 12.8%. |
| 0906 | Line from Trap 2 somewhat frosty past the joint to the flexible tube. Reduce V6 to 12.7%. |
| 0918 | Settle on V6 at 12.4%. Slow increase in G2 when V13b closed, line less frosty. |
| 0915 | Calibrate leak detector. |
| 0925 | Leak detector pumping on IVC, background 14 pbar*l/s |
| 0930 | With a background leak rate of 14 pbar*l/s, commence LN2 blowout. |
| 1007 | Oops - noticed that v9 was open, so cryocleaning wasn't really happening properly. v9 now closed, commencing cryocleaning. |
| 1035 | Switch back to turbo pumping on IVC. |
| 1100 | Calibrated the charge bias settings on DCRC50 using the mini breakout box and a multimeter (info stored in a spreadsheet on Vuk-01). |
| 1118 | Stop cryocleaning. Pump mix back to dump: G2 = 801.5 mbar, barometric pressure 30.01 “Hg, corrected dump pressure 804.5 mbar. |
| Note: | The Labview detector control/readout program reverses Qinner and Qouter Bias for DCRC50 (a RevC.1 board). This is something that must be considered for future data taking. |
| 1138 | Conduct a throughput test , and get a throughput rate of 66.5 mbar/min in G1. (G1 allowed to rise to about 628 mbar and fell to minimum of 97 mbar.) Background leak rate remained unchanged from 14 pbarL/s during test, indicating no leak. Pump mixture back to dump. Switch from leak checker to turbo pump on IVC. |
| 1300 | Flush main bath, and saw no change in leak rate from 14 pbarL/s. |
| 1315 | Add 4.6E-2mbar of He exchange gas to IVC. |
| 1320 | Commence 1st LHe transfer (-1.0%) |
| 1715 | End LHe transfer (91.3%). |
| 1730 | Fill LN2 cold trap dewar. Commence cryocleaning through cold trap 1. |
| 1805 | Stop cryocleaning and commence pumping mixture to dump. |
| 1821 | Isolate dump with G2=795 mbar, G1=0.4 mbar and P1=7 ubar. Pull LN2 cold traps from bath and open to P2 (isolated from scroll pump). |
| 1826 | P2=26 mbar, indicating that the traps are indeed dirty. Open scroll pump to P2 and commence pumping on both LN2 traps. |
| 1830 | With MC(Cernox)=11.1 K, open IVC to turbo pump to pump out IVC exchange gas. |