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2010/12/10

0116 Room temperature electrical check before fixing SQUET
Cooldown checkout sheet (rev C SQUET)
Detector: G9 BH: Stripline: 19
SC: ZB1-4-6 RT LN LHe
Face: 2 Date 2010-12-10 Date Date
SQUET: ZC23 Who HC&JZ Who Who HC
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead) (Gnd lead)
Nominal: Nominal: Nominal:
< 0.1 nS < 0.1 nS < 0.1 nS
Phonon
SQUID bias A/Ret 4 20 3 - 5 k 4.4 OK 1 - 2 k ?
SQUID bias B/Ret 19 34 5 OK
SQUID bias C/Ret 8 24 4.6 OK
SQUID bias D/Ret 23 39 4.3 OK
Feedback A/Ret 37 21 15 - 25 k 19 OK 9 - 13 k ?
Feedback B/Ret 2 18 20 OK
Feedback C/Ret 41 25 19 OK
Feedback D/Ret 22 6 18 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 91,100,85,86,86 OK 30 - 40 ?
QET B/Ret 35 29, 33, 47, 48 87,87,97,87 OK
QET C/Ret 7 5, 9, 10, 28 86,85,74,84 OK
QET D/Ret 38 36, 40, 43, 44 84,84,84,84 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.068 OK 1.0 - 1.1 k 1.0 - 1.1 k
Qi bias/QET Ret 15 24 - 26 nS 25 OK < 1 nS < 1 nS
Qo bias/QET Ret 11 26 OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK 6 - 8 nS ?
Qo feedback/Drain/Source 30 12, 27 23,23 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – < 0.1 nS –
Qo drain 12 chassis – OK – –
Qi source 31 chassis – OK – –
Qo source 27 chassis – OK – –
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V 0.723 OK 0.9 - 1.0 V ?
LED 1 chassis 42 1.0 - 1.1 V 1.138 – 1.2 - 1.5 V – ? –
LED 2 chassis 26 1.126 – – –
Cooldown checkout sheet (rev C SQUET)
Detector: G8F BH: Stripline: 20
SC: ZB1-5-1 RT LN LHe
Face: 6 Date 2010-12-10 Date Date
SQUET: ZC70 Who HC & JZ Who Who
Signal Pos. lead Gnd lead Nominal Actual Chassis Nominal Actual Chassis Nominal Actual Chassis
(Gnd lead) (Gnd lead) (Gnd lead)
Nominal: Nominal: Nominal:
< 0.1 nS < 0.1 nS < 0.1 nS
Phonon
SQUID bias A/Ret 4 20 3 - 5 k 4.9 OK 1 - 2 k ?
SQUID bias B/Ret 19 34 4.4 OK
SQUID bias C/Ret 8 24 4.7 OK
SQUID bias D/Ret 23 39 5.2 OK
Feedback A/Ret 37 21 15 - 25 k 29 OK 9 - 13 k ?
Feedback B/Ret 2 18 26 OK
Feedback C/Ret 41 25 28 OK
Feedback D/Ret 22 6 35 OK
QET A/Ret 3 1, 13, 14, 17, 32 60 - 80 85,83,80,81,80 OK 30 - 40 ?
QET B/Ret 35 29, 33, 47, 48 78,77,80,78 OK
QET C/Ret 7 5, 9, 10, 28 78,76,69,76 OK
QET D/Ret 38 36, 40, 43, 44 80,80,80,80 OK
Charge
FET heater +/- 45 46 1.0 - 1.1 k 1.061 OK 1.0 - 1.1 k 1.0 - 1.1 k
Qi bias/QET Ret 15 24 - 26 nS 25 OK < 1 nS < 1 nS
Qo bias/QET Ret 11 25 OK
Qi feedback/Drain/Source 50 16, 31 15 - 17 nS 23,23 OK 6 - 8 nS ?
Qo feedback/Drain/Source 30 12, 27 23,23 OK
Qi drain 16 chassis < 0.1 nS – OK < 0.1 nS – < 0.1 nS –
Qo drain 12 chassis – OK – –
Qi source 31 chassis – OK – –
Qo source 27 chassis – OK – –
FET Tsense +/FET heater- 49 46 0.6 - 0.7 V open OK 0.9 - 1.0 V ?
LED 1 chassis 42 1.0 - 1.1 V 1.155 – 1.2 - 1.5 V – ? –
LED 2 chassis 26 1.149 – – –
0434 Start pumping IVC
1427 IVC pressure 4.6E-5 mbar. Electrical checks are OK under vacuum.
1445 Tightened all the In seal again.
1446 IVC He signal 4.7E-10cc/s with the pumping station on. Isolate the leak checker, He BG 4.4E-10cc/s. The leak checker is contaminated, need to regenerate it. The background is still low enough to do a leak check.
1453 Isolated pumping station. IVC He background rose to 2.3E-9cc/s.
1503 Spray He around top In seal
No leak found at the BG level 2.4E-9cc/s.
The computer clock is 5 min faster. Adjust the clock to standard time.
1507 Spry He around the wire tune In seal and IVC middle In seal
1512 No leak found at the BG level 2.4E-9cc/s
1514 Spry He around the IVC bottom In seal
1517 No leak found at BG level 2.4E-9 cc/s
1717 Raise the Dewar
1742 Fill N2 cold trap full
1817 Pump and flush Dewar. He rises to 1E-6cc/s when filling He and then drops to 1E-8cc/s when bath is filled with He gas.
Pump the He gas in the bath out, leak signal rises while pumping
Fill bath with He gas again, He signal rises to 1E-6 and drops to 1E-8cc/s
1830 Spray He around fridge top, wire tube quick coupling, pumping manifold joints at 7E-9cc/s
1835 He signal rises to 7.9E-9cc/s slowly and then starts to drop.
1837 Pump the bath, He signal rise to 5E-7cc/s in one minute and then starts to drop slowly
1840 Stop pumping the bath. He signal stays at 1.2E-7 momentarily and then starts to rise slowly
1853 He signal 5.1E-7cc/s, still going up slowly
1856 Fill bath with He gas to -15in Hg pressure, He signal rises to 2.1E-6cc/s and then drops
1900 He signal 1.2E-6cc/s and roughly stabilizes at pressure -15in Hg.
1907 Fill bath to -9in Hg He gas. He signal drops from 1.2E-6cc/s.
1909 He signal drops to 1E-7cc/s
1911 Fill the bath to -4in of Hg, He signal drops
1914 He signal stays roughly at 2.4E-8cc/s
1916 Pump the bath to -12in of Hg. He signal rises slightly to 2.8E-8cc/s
1918 Pump the bath to -20in Hg, He signal rises raptly
1920 He signal stays roughly 5.7E-7cc/s and rise again
1924 He signal plateaus at 1e-6cc/s
1926 Pump the bath to -24in Hg
1935 He signal roughly plateaus at 2.2E-6cc/s.
2006 Over pressure bath and then open to air to put it at 1 atm. Close vent speedivalve. Evacuate 1K pot line and V2A and V5A.
2008 He signal drops to 2.5E-8 cc/s
2047 Leak 9.1E-9cc/s
Cryoclean the mixture
Cyrolean mixture settings