| 1130 | Perform mixture throughput test at MC = 300 K using above procedure with 3He pump on. Let G1 rise to 535 mbar before Step 3, then it falls to 41 mbar and starts to rise. Throughput = 5.6 mbar/min. |
| 1140 | Check pressure in 1K Pot: 22 mbar on P2, 0.03 atm on mechanical gauge. Pump out with Scroll Pump |
| 1145 | With 1K Pot speedivalve and needle valve closed, pump on Main Bath with scroll pump. Once P2 < 2 mbar, open 1K Pot speedivalve and needle valve (5 turns) to pump out 1K pot volume to < 1 mbar on P2. |
| 1150 | Close off scroll pump, then pressurize bath and 1K Pot (both sides) to about 0.5 bar with helium. Then pump it out again with scroll pump to < 1 mbar. |
| 1200 | Close off scroll pump, then pressurize bath and 1K Pot (both sides) to about 0.5 bar with helium. Then pump it out again with scroll pump to < 1 mbar. |
| 1205 | Pressurize main bath and 1K Pot (both sides) with helium to 420 mbar+1atm on G3, then close 1K Pot speedivalve and needle valve. |
| 1325 | As on 2021 June 9, we will flow mixture through the fridge during LN2 cooldown. Let mixture from dump through cold LN2 Trap 1 to fridge, both sides. Then isolate the sides and circulate with V6 open partially and mix open to dump. V9, V13b, V12b+speedi, V1, Condenser speedi, Still gate valves open, 3He pump on. Open V6 to 12.6%. |
| 1330 | P1(Condenser) → 0.32 mbar. |
| 1330 | Try closing V12a speedivalve. G1 falls as it should, showing we have throughput. Falls at 10.4 mbar/min . Open V12a speedivalve again. |
| 1335 | Let 5.4 mbar He exchange gas into IVC. |
| 1345 | MC(Cernox) = 296.4 K, Sorb = >249 K (max), IVC = 5.4 mbar, G2/G1/P1 (circulation) = 669/738/0.8 mbar, Level resistor = 0.980 kΩ. |
| 1350 | Begin LN2 transfer |
| 1355 | Tower thermometer / Goldman thermometer = 1.0013/2.0373 kOhm. |
| 1400 | MC(Cernox) = 295.8 K, Sorb = >249 K (max), IVC = 5.4 mbar, G2/G1/P1 (circulation) = 669/738/1.5 mbar, Level resistor = 1.051 kΩ. |
| 1400 | Close V12a speedivalve for 2 minutes to assess throughput. (Condenser pressure G1 should fall.) G1 falls at 14.6 mbar/min. Open V12a speedivalve again. |
| 1430 | MC(Cernox) = 247.1 K, Sorb = >249 K (max), IVC = 3.0 mbar, G2/G1/P1 (circulation) = 669/736/8.0 mbar, Level resistor = 1.227 kΩ. Tower/Goldman = 1.0023/2.0425 kΩ. |
| 1430 | Close V12a speedivalve for 2 minutes to assess throughput. (Condenser pressure G1 should fall.) G1 falls at 18.2 mbar/min. Open V12a speedivalve again. |
| 1455 | Transfer is going fast, no need to pressurize the LN2 Dewar this time (same as last time). Gauge on Dewar = 8.5 PSI |
| 1500 | MC(Cernox) = 172.4 K, Sorb = 236 K, IVC = 2.2 mbar, G2/G1/P1 (circulation) = 665/732/off_scale mbar, Level resistor = 1.333 kΩ. Tower/Goldman = 1.0067/2.0603 kΩ. |
| 1500 | Close V12a speedivalve for 2 minutes to assess throughput. (Condenser pressure G1 should fall.) G1 falls at 32.8 mbar/min. Open V12a speedivalve again. |
| 1530 | MC(Cernox) = 133.2 K, Sorb = 159 K, IVC = 1.9 mbar, G2/G1/P1 (circulation) = 657/722/off_scale mbar, Level resistor = 1.329 kΩ. Tower/Goldman = 1.0142/2.0868 kΩ. |
| 1530 | Close V12a speedivalve for 2 minutes to assess throughput. (Condenser pressure G1 should fall.) G1 falls at 47.6 mbar/min. Open V12a speedivalve again. |
| 1545 | Stop LN2 transfer. Close LN2 Dewar valve. Pull out Level Resistor and put stopper in port. Put ping-pong ball on MB exhaust port. |
| 1545 | Close V6 and turn off 3He pump. |