2016/12/28 (Wednesday)

Previous Day

	Status: IVC open, tower removed. Main bath vacuum jacket is evacuated. 1K Pot needle valve closed. LN2 traps clean. Mixture is in dump, fridge evacuated.

S101 rewiring plan:

1	side1	dib1	pB	bond to TES3 (long bonds)
2	side1	dib1	pD	remove bonds to TES2
3	side1	dib1	pC	bond to TES2 (long bonds)

4	side1	dib3	pC	redo pin6 bond to TES5

5	side2	dib1	pB	remove bonds to tes10
6	side2	dib1	pC	remove bonds to tes9
7	side2	dib1	pD	bond to tes9 and jump tes10 to tes9

8	side2	dib3	pA	remove bonds to tes11
9	side2	dib3	pA	bond to tes8, which requires surgery
10	side2	dib3	pB	bond to tes11

1015	Receive two 241Am sources from Berkeley. The larger one has a Be window, bag is labeled SS130, 0.5 uCi. For this one Matt P was not sure whether the window would allow the lower x-ray lines through. The smaller one is a smoke detector source, bag labeled EH&S#990, 1 uCi. As I understand it these are totally unshielded so that the alphas also come through unless we block them with something (thin foil).
	We have 1.7 mil thick Al foil = 43 um. Al stopping power for 10keV x-rays is 25 cm2/g, density 2.7 g/cm3, mean free path then is 148 um, so 43 um foil lets 75% of 10keV x-rays through. (Smallest 241Am x-ray is 13 keV.)

1015

Receive two 241Am sources from Berkeley. The larger one has a Be window, bag is labeled SS130, 0.5 uCi. For this one Matt P was not sure whether the window would allow the lower x-ray lines through. The smaller one is a smoke detector source, bag labeled EH&S#990, 1 uCi. As I understand it these are totally unshielded so that the alphas also come through unless we block them with something (thin foil).

We have 1.7 mil thick Al foil = 43 um. Al stopping power for 10keV x-rays is 25 cm2/g, density 2.7 g/cm3, mean free path then is 148 um, so 43 um foil lets 75% of 10keV x-rays through. (Smallest 241Am x-ray is 13 keV.)

1110	Remove S101 from purge cabinet to take up to wirebonding lab Wirebonder settings (buffer #23): Bond 1/2 Power = 480/480, Bond Times = 40/30, loop height = 50 mils, drop before clamp = 26 mils
1125	Remove S101 from bag in wirebonding lab
1135	Finish Step 4, redo DIB3pC pin6 bond to TES5. This channel previously read open, now is continuous (but resistance is a little lower than normal)
1145	Finish Step 1, bond DIB1pB to TES3. After completing this the resistance check showed DIB1pA reading only about 4 Ω, because the pin3 bond was in contact with the pA bonds and shorting them. I pushed the wire away a bit and it fixed this problem. But it may come back.
1150	Finish Step 2, remove DIB1pD bonds to TES2
1200	Finish Step 3, bond DIB1pC to TES2
1205	DIB1 and DIB3 channels on side 1 show continuity. Put S101 back in bag, Side 1 bonding fixes are finished.
1355	Remove S101 from bag in wirebonding lab again
1405	Finish Steps 5 & 6, remove existing tes9&10 bonds
1440	Finish Step 7, bond DIB1pD to tes9, then jump tes10 to tes9
1540	Finish Steps 8,9 and 10. Did surgery on one stadium in the 6th row counting in from the outside, and another stadium in the 7th row, on each stadium removing its connection to the rail on the side toward the center. This was done using the wirebonder microscope and carefully scraping with the tip of a hypodermic needle. These formed the two bond pads for tes8.
1555	Put S101 back in bag

what Matt Cherry sent
	pA	pB	pC	pD
DIB1	TES4	tes10	tes9	TES2
DIB3	tes11 (R very high)	n/c	TES5 (open)	n/c
DIB4	tes7	tes6	TES1	TES0
tes8 and TES3 not connected

New wiring
	pA	pB	pC	pD
DIB1	TES4	TES3	TES2	tes9(-tes10)
DIB3	tes8(d4)	tes11	TES5	n/c
DIB4	tes7	tes6	TES1	TES0

1635	Bring S101 into clean room

+lead	- lead	signal	typical	measured
Detector	S101	DIB	1
		date/who:	2016-12-28	MF
1	2	QET A	100 to 200 Ω	301 Ω
3	4	QET B	100 to 200 Ω	107 Ω
5	6	QET C	100 to 200 Ω	392 Ω
7	8	QET D	100 to 200 Ω	287 Ω
9	chassis	LED1 Rforward	8 to 9 MΩ	73 kΩ
9	chassis	LED1 Vforward	1.0 to 1.1 V	0.985 V
chassis	9	LED1 Rreverse	<1 nS	250 kΩ
10	chassis	LED2 Rforward	8 to 9 MΩ	767 kΩ
10	chassis	LED2 Vforward	1.0 to 1.1 V	1.045 V
chassis	10	LED2 Rreverse	<1 nS	<0.3 nS
11	12	Qo-Qi		n/a
12	11	Qi-Qo		n/a
1-8	chassis	<1 nS	<0.1 nS

+lead	- lead	signal	typical	measured
Detector	S101	DIB	3
		date/who:	2016-12-28	MF
1	2	QET A	100 to 200 Ω	131 Ω
3	4	QET B	100 to 200 Ω	26 Ω
5	6	QET C	100 to 200 Ω	27 Ω
7	8	QET D	100 to 200 Ω	open
9	chassis	LED1 Rforward	8 to 9 MΩ	open
9	chassis	LED1 Vforward	1.0 to 1.1 V	open
chassis	9	LED1 Rreverse	<1 nS	open
10	chassis	LED2 Rforward	8 to 9 MΩ	open
10	chassis	LED2 Vforward	1.0 to 1.1 V	open
chassis	10	LED2 Rreverse	<1 nS	open
11	12	Qo-Qi		n/a
12	11	Qi-Qo		n/a
1-8	chassis	<1 nS	<0.11 nS

+lead	- lead	signal	typical	measured
Detector	S101	DIB	4
		date/who:	2016-12-28	MF
1	2	QET A	100 to 200 Ω	349 Ω
3	4	QET B	100 to 200 Ω	~~420 Ω~~ open
5	6	QET C	100 to 200 Ω	347 Ω
7	8	QET D	100 to 200 Ω	378 Ω
9	chassis	LED1 Rforward	8 to 9 MΩ	open
9	chassis	LED1 Vforward	1.0 to 1.1 V	open
chassis	9	LED1 Rreverse	<1 nS	open
10	chassis	LED2 Rforward	8 to 9 MΩ	open
10	chassis	LED2 Vforward	1.0 to 1.1 V	open
chassis	10	LED2 Rreverse	<1 nS	open
11	12	Qo-Qi		n/a
12	11	Qi-Qo		n/a
1-8	chassis	<1 nS	<0.4 nS

QET B was ok when first checked, but after opening, taking photos, and closing again, it reads open.

DIB1 Side 1	DIB3 Side 1

Here I left Matt C's complicated hop-scotch bonds from pA to TES4. I added bonds from pB to TES3. One of these bonds was in contact with the pA bonds and caused a short, until I pushed the wire out of the way. The pD-TES2 bonds were removed and replaced with pC-TES2.	Here I simply replaced the bond from pin 6 (pC) to TES5. Previously this channel was reading open - now it reads unusually low at 27 Ω.

DIB1 Side 2	DIB3 Side 2

Here the pB-tes10 and pC-tes9 bonds were removed, and pD-tes9 was bonded, and tes10 was shorted to tes9	pA-tes11 was removed, and pB-tes11 was bonded instead. pA-tes8 was bonded using two stadiums with surgery to remove the connections on one side. tes8 is showing an ordinary resistance but tes11 is, like TES5, reading unusually low at 26 Ω.

Interestingly the two outer ring channels, tes11 and TES5, are reading very low resistances. This was not seen in Matt Cherry's original wiring, which seems to be a coincidence, since both of these were reading open or nearly so, so they must have had poor connections. One of Matt C's originals was a complicated hop-scotch bond. Now both bonds are direct and not long and are not in danger of shorting with other bonds. So the low resistance of these channels seems to be real.

There are also two channels that are somewhat lower than the others, both a little above 100 Ω - and these turn out to be the B-ring channels, the second-to-outermost channels. So there is a clear pattern here - the outer ring channels have lower resistances. And the trend continues to the center, because the two center channels are almost the highest resistances.

Position	Resistance [Ω]
A-ring (outermost)	26, 27
B-ring	107, 131
inner ring	287, 301, 347, 392, 392
center	378, 420

DIB4 Side 2

I didn't do any modifications on this one, but the pin4 bond broke during handling. It will need to be fixed. Unfortunately this is a “hop-scotch” bond, it may be difficult for me to fix it.

1710	Return S101 to purge cabinet

Next Day