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2024/01/29 (Monday)

Previous Day

  • Lab in-personnel: Himangshu, Ping
1155 Refilled LN2 Cold Trap 1 from bomb dewar. Partially filled, need to figure out how to unscrew the LN2 dewar plug
1400 Pump out line leading to 1K Pot with scroll pump (V4a open, 1kpot speedivalve closed). Then switch the line over to the 4He pump. Turn on 4He pump and make sure the pump exhaust is connected to recovery and open valve to recovery lines.
1410 Check pressure in 1K Pot by opening the 1kpot speedivalve with V4a closed: Mechanical gauge = 0.33 bar.
1324 Pump out 1K Pot by slowly opening V4a then the manual valve at the 4He pump until it just starts to make noise, once it quiets down somewhat open it up a little more. continue this until the valve is fully open.
1330 MC(Cernox)/Sorb/MC(H35) = 4.37/4.0/4.35, 1K Pot = 3.13 K / 0.95 mbar. G1 (fridge+dump) = 413 mbar. MB = 57.9%
Detector: S104 Stripline 41
SC: none 77 K
Face: 5 Date 01/24/2024
SQUET: ZC-70 Cable 2
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k – k OK
SQUID bias B/Ret 19 34 0.088 k OK
SQUID bias C/Ret 8 24 0.090 k OK
SQUID bias D/Ret 23 39 0.100 k OK
Feedback A/Ret 37 21 15 - 25 k 1.236k k OK
Feedback B/Ret 2 18 1.226 k OK
Feedback C/Ret 41 25 1.232 k OK
Feedback D/Ret 22 6 1.217 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 OL, 73.5 ,OL, OL, OL NOT OK
QET B/Ret 35 29, 33, 47, 48 46.3, 45.9, OL, OL OK
QET C/Ret 7 5, 9, 10, 28 41.7, 32.7, OL, OL OK
QET D/Ret 38 36, 40, 43, 44 38.3, 39.0, OL, OL OK
QET A/QET B 3 35 1000-3000 open
QET A/QET C 3 7 open
QET A/QET D 3 38 open
QET B/QET C 35 7 0.088K
QET B/QET D 35 38 open
QET C/QET D 7 38 open
open
LED 1 chassis 42 1.0 - 1.1 V open
LED 2 chassis 26 3.69 k
Motor Coil X1 169 OPEN
Motor Coil X2 169 0.036 k
Motor Coil Y1 169 0.034 k
Motor Coil Y2 169 0.02 k
Xendstop 1k -
Yendstop 1k 0.028 k
1355 Electrical check of ZC-13 after connecting to Stripline 43 on Tower Face 2 on Cable 3
Detector: S104 Stripline 43
SC: none 77 K
Face: 2 Date 01/24/2024
SQUET: ZC-13 Cable 3
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 0.087 k OK
SQUID bias B/Ret 19 34 0.102 k OK
SQUID bias C/Ret 8 24 – k OK
SQUID bias D/Ret 23 39 0.098 k NOT OK
Feedback A/Ret 37 21 15 - 25 k 1.237 k OK
Feedback B/Ret 2 18 1.241 k OK
Feedback C/Ret 41 25 – k OK
Feedback D/Ret 22 6 1.219 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 51.0, 31.6, 29.0, 29.2, 33.0 OK
QET B/Ret 35 29, 33, 47, 48 30.4, 30.6, 44.0, 30.4 OK
QET C/Ret 7 5, 9, 10, 28 34.6, 27.5, 18.3, 26.6 OK
QET D/Ret 38 36, 40, 43, 44 58.0, 47.2, 45.8, 45.7.8 OK
QET A/QET B 3 35 1000-3000 open
QET A/QET C 3 7 open
QET A/QET D 3 38 open
QET B/QET C 35 7 open
QET B/QET D 35 38 open
QET C/QET D 7 38 open
LED 1 chassis 42 1.0 - 1.1 V -
LED 2 chassis 26 -
Motor Coil X1 169 0.025 k
Motor Coil X2 169 open
Motor Coil Y1 169 0.041 k
Motor Coil Y2 169 0.017 k
Xendstop 1k -
Yendstop 1k -
1356 Electrical check of ZC-31 after connecting to Stripline 48 on Tower Face 3 on Cable 1
Detector: S104 Stripline 48
SC: none 77 K
Face: 3 Date 01/24/2024
SQUET: ZC-31 Cable 1
Signal Pos. lead Gnd lead Nominal Actual Chassis
(Gnd lead)
Nominal:
< 0.1 nS
SQUID bias A/Ret 4 20 3 - 5 k 0.106 k OK
SQUID bias B/Ret 19 34 0.075 k OK
SQUID bias C/Ret 8 24 0.105 k OK
SQUID bias D/Ret 23 39 0.095 k OK
Feedback A/Ret 37 21 15 - 25 k 1.223 k OK
Feedback B/Ret 2 18 1.233 k OK
Feedback C/Ret 41 25 1.229 k OK
Feedback D/Ret 22 6 1.217 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 72.1, 26.7, 23.0, 23.3, 29.5 OK
QET B/Ret 35 29, 33, 47, 48 42.7, 40.7, 43.1, 39.4 OK
QET C/Ret 7 5, 9, 10, 28 30.2, 22.9, 15.2, 38.5 OK
QET D/Ret 38 36, 40, 43, 44 237.8, 235.8, 235.3, 235.6 OK
QET A/QET B 3 35 1000-3000 open
QET A/QET C 3 7 open
QET A/QET D 3 38 open
QET B/QET C 35 7 open
QET B/QET D 35 38 open
QET C/QET D 7 38 open
LED 1 chassis 42 1.0 - 1.1 V -
LED 2 chassis 26 -
Motor Coil X1 169 OPEN
Motor Coil X2 169 0.038 k
Motor Coil Y1 169 0.033 k
Motor Coil Y2 169 0.020 k
Xendstop 1k -
Yendstop 1k 0.028 k
1437 Starting LHe transfer @MB=35%
1525 End LHe transfer @MB=94.8%
Leaving mixture in the fridge when starting 1K pot. Keep pumping on the 1Kpot during the next steps.
1552 Sorb = 4.2 K. G1 (fridge) = 453 mbar. 1K Pot = 3.4 K / 0.5 mbar
1555 Open 1K Pot needle valve → 15° (half unit on the needle marks). 1K Pot → 2.96 K / 5.5 mbar.
1556 Open 1K Pot needle valve → 30°. 1K Pot → 2.25 K / 13 mbar.
1600 MC(H35) temp starts to decrease quickly, flattens at around 3 K
1602 MC(Cernox)/Still/MC(H35) = 3.21/2.99/3.14, 1K Pot = 2.34 K / 14 mbar. G1 (fridge+dump) = 333 mbar.
1605 Open 1K Pot needle valve → 45°. 1K Pot → 1.78 K / 36 mbar.
1612 MC(H35)/Still/1KPot = 2.65/2.48/1.67 K / 34 mbar, G1(fridge+dump) = 179 mbar
1619 Close V3 and V9, leaving 126 mbar in the dump. Turn on 3He pump.
1622 Start circulation through Trap 1. V6 → 12.4%. Condenser(G1) peaks at 287 mbar. P2 jumps up to 550 mbar, settling down to 60 mbar and then 28 mbar.
1625 V6 → 13.0%. Condenser(G1) didn't peak. MC(H35) → 1.06 K. Still(P1) → 1.11 K / 3 mbar. After some time the Condenser peaked even higher. Condenser(G1) peaks at 100 mbar
1627 V6 → 13.4%. Condenser(G1)didn't peak . MC(H35) → 0.99 K. Still(P1) → 1.11 K /1.4 mbar. P2 = 8 mbar
1629 V6 → 13.8%. Condenser(G1) didnt see a peak. MC(H35) → 0.89 K. Still(P1) → 1.03 K / 1.1 mbar.
1631 V6 → 14.4%. Condenser(G1) peaks at 83.5 mbar. MC(H35) → 0.82 K. Still(P1) → 1.01 K / 0.75 mbar.
1632 V6 → 15.0%. Condenser(G1) peaks at 87.5 mbar. MC(H35) → 0.76 K. Still(P1) → 1.02 K / 0.55 mbar.
1634 V6 → 100.%. Condenser(G1) peaks at 91.6 mbar. MC(H35) → 0.66 K. Still(P1) → 1.00 K / 0.22 mbar.
1642 Both G1 and P2 started increasing slowly. P2 went upto 60 mbar and settled back down to 30 mbar. G1 slowly creeping up
1644 MC(H35) = 208 mK, Still = 1.13 K /0.160 mbar, 1KPot = 1.64 K / 32 mbar, G1/G2 = 96/108 mbar
1647 Open V14 to let the remaining mix out of the dump and into circulation. P1(Still) went off-scale then falls again. MC(H35) peaks at 77 mK. Condenser peaks at 243 mbar. P2 peaks at 70 mbar.
1701 Tower(U28)/MC(H35)/Coldplate = 183/270/97 mK, Still(P1) = 1.08 K / 0.11 mbar / 0 mW, G1/G2 = 80/92 mbar, 1K Pot(P2) = 45° / 1.645 K / 30 mbar, MB = 94.2%
1700 Still (P1) < 4 mbar, close V14

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