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2024/07/22 (Monday)

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  • Lab in-personnel: Himangshu
1400 IVC under turbo = 6.3e-5 mbar.
Detector: S104 Stripline 41
SC: none *293 K*
Face: 5 Date 07/22/2024
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 4.263 k OK
SQUID bias C/Ret 8 24 4.542 k OK
SQUID bias D/Ret 23 39 5.047 k OK
Feedback A/Ret 37 21 15 - 25 k – k OK
Feedback B/Ret 2 18 25.32 k OK
Feedback C/Ret 41 25 28.02 k OK
Feedback D/Ret 22 6 34.07 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 OL, 101.4 ,OL, OL, OL NOT OK
QET B/Ret 35 29, 33, 47, 48 81.2, 81.6, OL, OL OK
QET C/Ret 7 5, 9, 10, 28 104.5, 84.1, OL, OL OK
QET D/Ret 38 36, 40, 43, 44 83.8, 84.5, 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 5.9K
QET B/QET D 35 38 open
QET C/QET D 7 38 open
LED 1 chassis 42 1.0 - 1.1 V 1.106
LED 2 chassis 26 1.233
Motor Coil X1 169 186
Motor Coil X2 169 246
Motor Coil Y1 169 229
Motor Coil Y2 169 193
Xendstop 1k -
Yendstop 1k 32
1410 Electrical check of ZC-13 after connecting to Stripline 43 on Tower Face 2 on Cable 3
Detector: S104 Stripline 43
SC: none 293 K
Face: 2 Date 07/22/2024
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 4.580 k OK
SQUID bias B/Ret 19 34 4.832 k OK
SQUID bias C/Ret 8 24 – k OK
SQUID bias D/Ret 23 39 4.890 k NOT OK
Feedback A/Ret 37 21 15 - 25 k 18.76 k OK
Feedback B/Ret 2 18 19.82 k OK
Feedback C/Ret 41 25 – k OK
Feedback D/Ret 22 6 20.57 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 158, 74, 69,70, 76 OK
QET B/Ret 35 29, 33, 47, 48 75, 75, 96, 75 OK
QET C/Ret 7 5, 9, 10, 28 108, 80, 61, 69 OK
QET D/Ret 38 36, 40, 43, 44 90, 76, 76, 76 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
1420 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 4.21 k OK
SQUID bias B/Ret 19 34 4.03 k OK
SQUID bias C/Ret 8 24 4.48 k OK
SQUID bias D/Ret 23 39 4.12 k OK
Feedback A/Ret 37 21 15 - 25 k 26 k OK
Feedback B/Ret 2 18 26 k OK
Feedback C/Ret 41 25 27 k OK
Feedback D/Ret 22 6 26 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 141, 68,62, 62, 70 OK
QET B/Ret 35 29, 33, 47, 48 67, 67, 93, 67 OK
QET C/Ret 7 5, 9, 10, 28 104, 71, 55, 55 OK
QET D/Ret 38 36, 40, 43, 44 72,73, 72, 73 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 6.11k
Pump out fridge lines:
  1. Make sure mixture is isolated in the dump.
  2. Check fridge pressures by opening condenser speedivalve+V1 and still gate valve: LHe trap+Condenser(G1)/Still(P1) = no change/1700 mTorr.
  3. Connect scroll pump to He-4 pump line, turn it on.
  4. Open pump line valve, V5A, V2A, V4, wait a minute, then open V5.
  5. You're now pumping on the fridge lines. Wait until P1 and G1 flatten out.
  6. Close condenser speedivalve and still gate valve, V1, V5, V2A, V5A and close and turn off the scroll pump.
1530 G1 remain at zero level. P1 stable at 1700 mTorr
1535 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, V8+speedivalves, V3 and slowly open V5. Wait for G1 to be rise and then fall, close to G2.
  3. Close V3 and V5, open V1
  4. monitor G1
1245 Perform mixture throughput test at MC = 300 K using above procedure with 3He pump on. Let G1 rise to 600 mbar before Step 3, then it falls to ~25 mbar on step 4 and starts to rise. Reaches ~50mbar after 6.5min Throughput = 3.8 mbar/min. (very rough estimation)
1317 Pump mixture back to dump:
  1. Close V8 then turn on the 3He pump.
  2. Open V3, V5.
  3. Open V2 initially to marked 1, then further in steps to 30 degree, making sure G2 doesn't rise too quickly.
  4. Continue pumping until G1 stabilizes at a minimum value (typically a few mbar) and P1 is less than 100 mTorr.
  5. Stop pumping on cold trap 1, close coldtrap 1 speedivalves and V3.
  6. Stop pumping on fridge, close still gate valve, condenser speedivalve, V1, V5.
  7. Close V2 completely, close V9.

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