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2024/01/24 (Wednesday)

Previous Day

  • Lab in-personnel: Himangshu
Status Run 79 beginning, LN2 transfer yesterday, mixture in fridge
1250 MC(Cernox) = 77.48 K, Sorb = 130.0 K, G2/G1/P1 (circulation) = 532/485/maxout mbar
1255 IVC = 2.2 mbar, Start pumping out IVC with Scroll Pump. When pressure falls below 0.1 mbar switch to Turbo Pump.
1321 P2 was maxed out when I came in. Connect the scroll pump and pump out that line.
1322 Fill LN2 cold trap dewar
1330 Turn on 3He pump and open V6 to 12.4%, reestablishing circulation like yesterday. G2/G1/P1 → 597/654/0.40 mbar and settle
1334 Close V12a+speedivalve for 2 minutes to assess throughput. G1 falls at 59 mbar/min, good. Reopen V12a+speedivalve
1340 Pump mixture to dump. Close V13a, open V3 (V9 already open), open V6 more in steps up to 30%
1353 G1 = 1.5 mbar, P1 = 0.095 mbar. Stop pumping mixture to dump. Close V12a+speedivalve, close V1, close V3, close V6
1356 V6 is fully closed, close V9, leaving 644.1 mbar in the dump. Leave 3He pump on.
Throughput test procedure, Cold Trap 1:
  1. All mixture in dump, LN2 trap 1 cold, condenser & still valves open (3He pump on - optional)
  2. Open V9, V13a, V12a+speedivalve, V3. Wait for G1 to be close to G2 (within 100 mbar).
  3. Close V12a+speedivalve and V3, open V1
  4. monitor G1
1456 Perform mixture throughput test at MC = 77 K using above procedure with 3He pump on. Let G1 rise to 360 mbar before Step 3, then it falls to 32 mbar, then rises. Throughput = 20 mbar/min.
1500 Open mixture to both sides of the fridge (V3) and cold LN2 Trap 1 (V12a+speedivalve).
1504 Turbo in IVC = 46 nbar, with the turbo valved out for a min, IVC = 460 nbar
1507 Pump IVC with Leak Detector, Turbo valved out, IVC = 1004 pbarL/s, with turbo= 233 pbar L/s
The leak checker was making a leak alarm noise once we valved the turbo out, but the rate is pretty low, we just turned its volume down…
1620 Electrical check of ZC-70 after connecting to Stripline 41 on Tower Face 5 with Cable 2
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 1.656 k OK
SQUID bias C/Ret 8 24 1.766 k OK
SQUID bias D/Ret 23 39 1.989 k OK
Feedback A/Ret 37 21 15 - 25 k – k OK
Feedback B/Ret 2 18 9.19 k OK
Feedback C/Ret 41 25 13.85 k OK
Feedback D/Ret 22 6 16.94 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 OL,OL,OL, OL, OL NOT OK
QET B/Ret 35 29, 33, 47, 48 70, 66, OL, OL OK
QET C/Ret 7 5, 9, 10, 28 45, 44.5, OL, OL OK
QET D/Ret 38 36, 40, 43, 44 50.2, 50.9, OL, OL OK
QET A/QET B 3 35 1000-3000 open
QET A/QET C 3 7
QET A/QET D 3 38 open
QET B/QET C 35 7 6K
QET B/QET D 35 38 open
QET C/QET D 7 38 open
open
LED 1 chassis 42 1.0 - 1.1 V 1.384
LED 2 chassis 26 1.295
Motor Coil X1 169 OPEN
Motor Coil X2 169 72.5
Motor Coil Y1 169 95.3
Motor Coil Y2 169 86.3
Xendstop 1k -
Yendstop 1k 234
1402 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 1.736 k OK
SQUID bias B/Ret 19 34 1.857 k OK
SQUID bias C/Ret 8 24 – k OK
SQUID bias D/Ret 23 39 1.892 k NOT OK
Feedback A/Ret 37 21 15 - 25 k 7.47 k OK
Feedback B/Ret 2 18 8.01 k OK
Feedback C/Ret 41 25 – k OK
Feedback D/Ret 22 6 8.42 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 63.1, 41.3, 38.9, 39.1, 43.7 OK
QET B/Ret 35 29, 33, 47, 48 109.7, 84.9, 106.8, 84.2 OK
QET C/Ret 7 5, 9, 10, 28 38.6, 37.5, 28.1, 36.9 OK
QET D/Ret 38 36, 40, 43, 44 66, 44, 43, 43.5 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 -
1310 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 – OK
SQUID bias B/Ret 19 34 1.710 k OK
SQUID bias C/Ret 8 24 1.766 k OK
SQUID bias D/Ret 23 39 1.99 k OK
Feedback A/Ret 37 21 15 - 25 k – k OK
Feedback B/Ret 2 18 9.19 k OK
Feedback C/Ret 41 25 13.85 k OK
Feedback D/Ret 22 6 16.94 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 OL, OL.OL.OL.OL OK
QET B/Ret 35 29, 33, 47, 48 48, 48, OL, OL OK
QET C/Ret 7 5, 9, 10, 28 45, 45, OL, OL OK
QET D/Ret 38 36, 40, 43, 44 52, 51, 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 open
QET B/QET D 35 38 open
QET C/QET D 7 38 5.76k
LED 1 chassis 42 1.0 - 1.1 V -
LED 2 chassis 26 -
1700 Open V6 to 12.4% to restart flow, close v3
1713 Start LN2 transfer to topup for tonight. Blowout will be done tomorrow
1714 MC(Cernox) = 77.5 K, Sorb = 130.6 K, IVC = –, G2/G1/P1 (circulation) = 592/648/0.6 mbar, Level resistor = 1.311 kΩ.
1747 MC(Cernox) = 77.5 K, Sorb = 130.6 K, IVC = –, G2/G1/P1 (circulation) = 592/648/0.6 mbar, Level resistor = 1.339 kΩ.
1756 Stop LN2 transfer. Close LN2 Dewar valve. Pull out Level Resistor and put stopper in port. Put ping-pong ball on MB exhaust port.
1756 Close V6 and turn off 3He pump.

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