UMN CDMS Wiki archive

start › cdms › k100 › run_diary › 20210113

2021/01/13 (Wednesday)

Lab in-person: Matt
Virtual partner: Zach

Status	Run 74 prep. 1K Pot pumped out and isolated. Fridge and 4He and LN2 Trap 1 isolated, not pumped out. Cryostat vacuum jacket pumped out. IVC open, tower removed.
1455	Matt arrives at lab.
1520	Attach Side Coax ST-3-3 to DIB1 on Tower Face 2. Screw in one screw at bottom.
1525	Attach Side Coax ST-3-10 to DIB2 on Tower Face 5. Screw in one screw at bottom.

Tower Electrical Checkout

+ lead	-lead	signal	typical	previous	measured
Detector	USD1	DIB	1
note: DIB1 Pin7 is connected to Side2 electrode. This is routed to Tower Face 4 Pin 9
side coax	ST-3-3	date/who:	2021-01-13/MF&ZW
face	2
9	chassis	LED1 Rforward	8 to 9 MΩ	780kΩ	775kΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	1.105V	1.105V
chassis	9	LED1 Rreverse	<1 nS	<0.2nS	<0.1nS
10	chassis	LED2 Rforward	8 to 9 MΩ	781kΩ	773kΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	1.107V	1.104V
chassis	10	LED2 Rreverse	<1 nS	<0.8nS	0.3 nS
11	Face4-9	Qo Rbias	24 to 26 nS	26nS	25.4 nS
11	12	Qo C coupling	<1 nS	<.2nS	<0.1 nS
13	12	Qo Rfeedback	24 to 26 nS		25.4 nS
14	Face4-9	Qi Rbias	24 to 26 nS	25nS	25.4 nS
14	15	Qi C coupling	<1 nS	<0.2nS	<0.1nS
16	15	Qi Rfeedback	24 to 26 nS	25nS	25.4nS
1-8, 11-16	chassis	Chassis shorts	<1 nS	<1nS	<0.1nS

+ lead	-lead	signal	typical	previous	measured
Detector	USD1	DIB	2
note: DIB1 Pin7 is connected to Side2 electrode. This is routed to Tower Face 4 Pin 9
side coax	ST-3-10	date/who:	2021-01-13/MF&ZW
face	5
9	chassis	LED1 Rforward	8 to 9 MΩ	770kΩ	756kΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	1.12V	1.107V
chassis	9	LED1 Rreverse	<1 nS	<2.0nS	3nS
10	chassis	LED2 Rforward	8 to 9 MΩ	787kΩ	776kΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	1.12V	1.107V
chassis	10	LED2 Rreverse	<1 nS	<0.5nS	0.1nS
11	Face4-9	Qo Rbias	24 to 26 nS	25nS	26.4nS
11	12	Qo C coupling	<1 nS	<.5nS	<0.1nS
13	12	Qo Rfeedback	24 to 26 nS	<1 nS	26nS
14	Face4-9	Qi Rbias	24 to 26 nS	<1 nS	25.0nS
14	15	Qi C coupling	<1 nS	<0.2nS	<0.1nS
16	15	Qi Rfeedback	24 to 26 nS	26nS	26.1 nS
1-8, 11-16	chassis	Chassis shorts	<1 nS	<1nS	<0.1nS

Source mover	date/who:	2021-01-13/MF&ZW
Face:	4
1	2	Motor Coil 1	7.47kΩ
3	4	Motor Coil 2	7.62kΩ
2	3	Coil isolation	<0.1nS
1-6, 9	chassis	Chassis shorts	<0.1nS

1540	Tape down motor wires and endstop wires. For motor wires I put a piece of Kapton tape in the middle of the sticky side of the copper tape so as not to stick it to the stripline.
1550	Attach 30mK can adapter (although I had to redo it because I forgot to run the thermometer wire through the hole). It looks like the loop in the motor wire striplines will just clear the can.
1600	Tower is complete
1630	I'll do the tower installation as basically a reverse of the removal from Nov 24. Start by sliding the fridge stand ring down on the guide shafts.
1635	Lower scissor jack completely and put tower stand on it. Slide it under the IVC. Note that you need to pull the guide shafts apart slightly to get them around the IVC.
1635	Slide the ring up and attach to the bottom of the IVC. (Note: this seems like an opportunity to scratch the o-ring surface. That's probably why we sometimes get scratches and leaks there.)
1640	Put the threaded rods in with the nuts near the top.
1645	Begin raising the tower stand with the scissor jack. Pull the 600 mK rod out of the way to clear the stack.
1645	Guide the bottoms of the striplines past the edge of the scissor jack
1645	Make sure fridge wire doesn't get snagged as tower is raised. Make sure side coaxes aren't scraping the sides of the can.
1650	When the tower stand is high enough, screw threaded rods into base.
1655	Keep raising tower and watching that nothing gets snagged
1700	When scissor jack is fully extended, 600 mK rod is just above adapter ring.
1700	Tighten down nuts on threaded rods, then collapse scissor jack. I'll leave it there - next step will be to elevate scissor jack so we can continue using it to lift the stand the rest of the way.
1705	Matt leaves lab.