2017/09/05 (Tuesday) · UMN CDMS Wiki archive

Status	Both LN2 traps warm and pumped out. Mixture in dump (LHe cold trap isolated at around 20 K). 1K Pot needle valve open. Cryostat vacuum jacket pumped out.
1115	Post-run 63 tower electrical checkout:

+lead	- lead	signal	typical	prev.	measured
Detector	G132	DIB	1
side coax	ST-3-3	date/who:	2017-09-05	GR MF
face	1
1	2	QET A	100 to 200 Ω	174 Ω	174 Ω
2	4	QETA-B	100 to 200 Ω	209	206 Ω
3	4	QET B	100 to 200 Ω	184 Ω	183 Ω
4	6	QETB-C	100 to 200 Ω	184	183 Ω
5	6	QET C	100 to 200 Ω	157 Ω	157 Ω
6	8	QETC-D	100 to 200 Ω	172	170 Ω
7	8	QET D	100 to 200 Ω	97.5 Ω	98 Ω
2	8	QETA-D	100 to 200 Ω	179	177 Ω
9	chassis	LED1 Rforward	8 to 9 MΩ	730 kΩ	680 kΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	1.18 V	1.118 V
chassis	9	LED1 Rreverse	<1 nS	1.5 nS	2 nS
10	chassis	LED2 Rforward	8 to 9 MΩ	740 kΩ	740 kΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	1.11 V	1.15 V
chassis	10	LED2 Rreverse	<1 nS	1.8 nS	2 nS
1	11	Qo Rbias	24 to 26 nS	25 nS	25 nS
12	11	Qo C coupling	<1 nS	<1 nS	<1 nS
12	13	Qo Rfeedback	24 to 26 nS	25 nS	25 nS
1	14	Qi Rbias	24 to 26 nS	26 nS	25 nS
15	14	Qi C coupling	<1 nS	<1 nS	<1 nS
15	16	Qi Rfeedback	25 nS		25 nS
All pins → Ground			<1.0nS	short	1-8 ~150 Ω, 9-10 ~700 kΩ

+lead	- lead	signal	typical	prev.	measured
Detector	G132	DIB	3
side coax	ST-3-9	date/who:	2017-09-05	GR MF
face	5
1	2	QET A	100 to 200 Ω	114 Ω	114 Ω
2	4	QETA-B	100 to 200 Ω	161	159 Ω
3	4	QET B	100 to 200 Ω	129 Ω	129 Ω
4	6	QETB-C	100 to 200 Ω	*186 Ω**	open
5	6	QET C	100 to 200 Ω	*153 Ω**	open
4	5	QETB-C	100 to 200 Ω	169	166 Ω
6	8	QETC-D	100 to 200 Ω	260	open
7	8	QET D	100 to 200 Ω	132 Ω	133 Ω
2	8	QETA-D	100 to 200 Ω	167	165 Ω
9	chassis	LED1 Rforward	8 to 9 MΩ	336	980 kΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	0.65! V	ol
chassis	9	LED1 Rreverse	<1 nS	15 MΩ	16 MΩ
10	chassis	LED2 Rforward	8 to 9 MΩ	793 kΩ	790 kΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	1.11 V	1.116 V
chassis	10	LED2 Rreverse	<1 nS	<1 ns	<1 nS
1	11	Qo Rbias	24 to 26 nS	25 nS	25 nS
12	11	Qo C coupling	<1 nS	<1 nS	<1 nS
12	13	Qo Rfeedback	24 to 26 nS	25 nS	25 nS
1	14	Qi Rbias	24 to 26 nS	25 nS	25 nS
15	14	Qi C coupling	<1 nS	<1 nS	<1 nS
15	16	Qi Rfeedback	24 to 26 nS	25 nS	25 nS
All pins → Ground			<1.0nS	short, ~MΩ 1-8. Later worrse	1-8 ~100Ω except 6 open. Others open
* = this was open at first. Pushed on the side coax at dib to fix it ! = here's the 1650 nm LED after we found the shorts on this DIB we found them on DIB 1 as well, originally that one was ok

+lead	- lead	signal	typical	prev.	measured
Detector	G132	DIB	4
side coax	ST-3-10	date/who:	2017-09-05	GR MF
face	3
1	2	QET A	100 to 200 Ω	143 Ω	143 Ω
2	4	QETA-B	100 to 200 Ω	188 Ω	189 Ω
3	4	QET B	100 to 200 Ω	185 Ω	186 Ω
4	6	QETB-C	100 to 200 Ω	200 Ω	204 Ω
5	6	QET C	100 to 200 Ω	181 Ω	182 Ω
6	8	QETC-D	100 to 200 Ω	190 Ω	191 Ω
7	8	QET D	100 to 200 Ω	134 Ω	132 Ω
2	8	QETA-D	100 to 200 Ω	174 Ω	175 Ω
9	chassis	LED1 Rforward	8 to 9 MΩ	794 kΩ	790 kΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	1.11 V	1.12 V
chassis	9	LED1 Rreverse	<1 nS	<1 nS	1 nS
10	chassis	LED2 Rforward	8 to 9 MΩ	786 kΩ	790 kΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	1.10 V	1.2 V
chassis	10	LED2 Rreverse	<1 nS	<1 nS	1 nS
1	11	Qo Rbias	24 to 26 nS	n/c	<1 nS
12	11	Qo C coupling	<1 nS	<1 nS	<1 nS
12	13	Qo Rfeedback	24 to 26 nS	26 nS	26 nS
1	14	Qi Rbias	24 to 26 nS	n/c	n/c
15	14	Qi C coupling	<1 nS	<1 nS	<1 nS
15	16	Qi Rfeedback	24 to 26 nS	26 nS	26 nS
All pins → Ground			<1.0nS		1-8 ~100-400 Ω

1155	On DIB3pC (5-6), which is open, we were able to get it to connect by pushing in the side coax at the detector dib. ~120 Ω. Becomes open again when you stop pushing on it.
1200	Continue tower disassembly
1215	While removing side coax ST-3-9, hit wirebond area with thumb. Probably broke some bonds… yes, seems like all resistor connections are broken, maybe one of the capacitor connections. Will need to repair with wirebonder. Althrough we only need two to run charge on the iZIP, so could wait on this.
1245	Put G132 in purge. NOTE: we forgot to put the tower in purge after deinstallation, so it has been in the anteroom for a week.