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2025/07/31 (Thursday)

Previous Day

  • Lab in-personnel: Himangshu, Yan, Elliot
Status MC(Cernox) = 284.9K; still = 291.6 K; fridge warmed up.
ToDo

1. leak check the relief valve again (after it hissed when overpressured).

2. fix indium seal leak

3. electrical check

0850 pump out 1K and MB. 1K speedivalve and needle valve are fully open.
1030 flush 1K and MB by venting to air and pump down. repeated once.
1055 leak check the relief valve by spraying helium.
1305 begin cryo cleaning
17xx Starting electric check.
Detector: S104 Stripline 48
SC: none 300 K 300 K
Face: 3 Date 07/24/2025
SQUET: ZC-39 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 4.2 k OK
SQUID bias B/Ret 19 34 3.96 k OK
SQUID bias C/Ret 8 24 — k 20 nS
SQUID bias D/Ret 23 39 — k OK
Feedback A/Ret 37 21 15 - 25 k 24.58 k 65 nS
Feedback B/Ret 2 18 23.21 k OK
Feedback C/Ret 41 25 25.40 k short
Feedback D/Ret 22 6 16.39 k 35 nS
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 119, 65, 61, 63, 63 ?
QET B/Ret 35 29, 33, 47, 48 78, 77, 119, 79 ?
QET C/Ret 7 5, 9, 10, 28 106, 67, 57, 104 ?
QET D/Ret 38 36, 40, 43, 44 75, 75, 75, 75 ?
QET A/QET B 3 35 1000-3000 1984
QET A/QET C 3 7 2662
QET A/QET D 3 38 2393
QET B/QET C 35 7 2767
QET B/QET D 35 38 2482
QET C/QET D 7 38 1496
1557 Electrical check of ZC-70+interposer
Cooldown checkout sheet (rev C SQUET)
Detector: S104 Stripline 41
SC: none 300 K 300 K
Face: 5 Date 07/31/2025
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 OL
SQUID bias B/Ret 19 34 4.2 k OL5 Mohm, Squid and Feedback is shorted by 6 kOhm
SQUID bias C/Ret 8 24 4.5 k OL4 Mohm, Squid and Feedback is shorted by 11 Mohm
SQUID bias D/Ret 23 39 5.0 k OK
Feedback A/Ret 37 21 15 - 25 k – k OK
Feedback B/Ret 2 18 25 k OL, 5 Mohm
Feedback C/Ret 41 25 27.7 k OL, 6 Mohm
Feedback D/Ret 22 6 33.7 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 OL, 95jumps around, 100 kOhms; then recheck 164 ohms, OL, OL, OL OL, 4 Mohm
QET B/Ret 35 29, 33, 47, 48 90.8, 90.5, OL, OL OL, 4 Mohm
QET C/Ret 7 5, 9, 10, 28 130, 79, OL, OL OL, 4 Mohm
QET D/Ret 38 36, 40, 43, 44 75.2, 75.9, OL, 4 MohmOL OL, 4 Mohm
QET A/QET B 3 35 1000-3000 17.9 kohm 250 Kohm fluctuating ???
QET A/QET C 3 7 800, 270 Kohm fluctuating
QET A/QET D 3 38 1947, 270 Kohm fluctuating
QET B/QET C 35 7 17.4 kOhm ???
QET B/QET D 35 38 18.5 kOhm ???
QET C/QET D 7 38 1636
LED 1 chassis 42 1.0 - 1.1 V 1.119 1.105
LED 2 chassis 26 1.108 1.094
Motor Coil Y1 pBr3 pBr4 0.221 k
Motor Coil Y2 pCr3 pCr4 0.190 k
Motor Coil X1 pAr3 pAr4 0.183 k
Motor Coil X2 pAr5 pDr3 0.170 k
Xendstop pAr1 chassis open
Yendstop pDr4 chassis 34 ohm
1931 3rd Electrical check of ZC-13 after connecting to Stripline 43 on Tower Face 2
Cooldown checkout sheet (rev C SQUET)
Detector: S104 Stripline 43
SC: none 300 K 300 K
Face: 2 Date 07/31/2025
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 4.584 k 39 nSOL
SQUID bias B/Ret 19 34 4.711 k OK
SQUID bias C/Ret 8 24 — k OK
SQUID bias D/Ret 23 39 4.823 k OK
Feedback A/Ret 37 21 15 - 25 k 18.58 k OK
Feedback B/Ret 2 18 19.6 k OK
Feedback C/Ret 41 25 — k OK
Feedback D/Ret 22 6 20.37 k OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 144.2, 76.2, 72.1, 72.4, 75.6 OL, 4 Mohm
QET B/Ret 35 29, 33, 47, 48 84.5, 90.0, 149.1, 89.8 OL, 4 Mohm
QET C/Ret 7 5, 9, 10, 28 94.2, 74.6, 63.8, 72.1 OL, 4 Mohm
QET D/Ret 38 36, 40, 43, 44 86.4, 75.3, 74.2, 74.6 OL, 4 Mohm
QET A/QET B 3 35 1000-3000 1652
QET A/QET C 3 7 2005
QET A/QET D 3 38 1712
QET B/QET C 35 7 1860
QET B/QET D 35 38 1791
QET C/QET D 7 38 2142

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