2017/09/13 (Wednesday)

Previous Day

1015	Solder KF 25mm connection onto other end of recovery gas warming coil.
1045	On Monday's tower electrical checkout we didn't look at the DIB LEDs. Some of these may work, and we may want to use them. Check them now:

Tower Level Checkout
Detector	S1502	Date	2017-09-12	Who	GR MF
DIB	1	Face	5	Side Coax	ZB1-1-9
+lead	- lead	signal	typical	prev.	measured
9	chassis	LED1 Rforward	8 to 9 MΩ	-	< 0.1 nS
9	chassis	LED1 Vforward	1.0 to 1.1 V	-	OL
chassis	9	LED1 Rreverse	<1 nS	-	< 0.1 nS
10	chassis	LED2 Rforward	8 to 9 MΩ	-	< 0.1 nS
10	chassis	LED2 Vforward	1.0 to 1.1 V	-	OL
chassis	10	LED2 Rreverse	<1 nS	-	0.1 nS
DIB	3	Face	3	Side Coax	ZB1-1-11
+lead	- lead	signal	typical	prev.	measured
9	chassis	LED1 Rforward	8 to 9 MΩ	-	0.77 MΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	-	1.103 V
chassis	9	LED1 Rreverse	<1 nS	-	0.3 nS
10	chassis	LED2 Rforward	8 to 9 MΩ	-	0.715 MΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	-	1.072 V
chassis	10	LED2 Rreverse	<1 nS	-	22 MΩ
DIB	4	Face	2	Side Coax	ZB1-6
+lead	- lead	signal	typical	prev.	measured
9	chassis	LED1 Rforward	8 to 9 MΩ	-	0.79 MΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	-	1.106 V
chassis	9	LED1 Rreverse	<1 nS	-	< 0.1 nS
10	chassis	LED2 Rforward	8 to 9 MΩ	-	0.763 MΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	-	1.105 V
chassis	10	LED2 Rreverse	<1 nS	-	0.2 nS

1105	Attach 150mm adapter plate to tower. This is relatively simple: each piece attaches separately to the 30mK stage ears, phillips-head brass screws. Then the bracket bars attach to the bottom, socket-head stainless screws.

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1115	Discover that you can't put the bracket bars on if the adapter joints are under side coaxes - the side coax extenders block the screw holes! Remove adapter and rotate it to avoid this.
1135	Finish attaching adapter plate, and also tape off holes into the can with copper tape to reduce radiant heat. Tented some of these to help pumpout.

653	654

1145	Double bag tower and put in anteroom. Ready to install.
1211	Pump out recovery warming coil with scroll pump. Pressure settled at 0.01 mbar. After isolating the pump and letting the coil sit for a while, it creeps up from 10 μbar to 54 μbar over 15 minutes. That's probably good enough.
1330	Begin tower installation:
	Align tower with desired orientation: DIB1 points East.
	Before raising tower, plug in thermometer wire. Then bunch up excess and tape to top of tower.
	Raise tower until adapter touches bottom rim of 30mK can.
	Look up at holes to align them with the can. Start a few screws loosely, then insert all screws loosely. It wasn't too difficult this time to get them all aligned.
	Torque all screws attaching tower to 30mK can.
	Replace stripline heatsink at bottom of IVC middle can.
	Check tower thermometer at LakeShore bridge: 1.000 kΩ, all good.
1615	Finish installation activities for today.

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