2018/02/22 (Thursday)

Previous Day

1500	Examine USD1 in cleanroom. Quick electrical check at DIB shows everything still connected, channels and LEDs, as per Run 58.
1500	Also measured from DIB to channel on detector surface, with one meter probe touching channel on detector directly:

USD1 DIB-to-detector surface check [Ω]
	DIB1qI	DIB1qO	DIB2qI	DIB2qO
q1	20	37	46	17
q2	19	33	44	12
q3	19	27	42	14
q4	19	28	36	13
bold indicates the channel connected directly

For DIB2qI and DIB2qO, the directly-connected channel has the lowest resistance as would be expected. For DIB1qO this is not the case. For DIB1qI it's pretty ambiguous, they are all very close.

In Run 58 we seemed to have a problem with q3/DIB1qI. It seemed to have damped pulses - there were some pulses but always very small, suggesting maybe a poor connection to the channel. The table above doesn't really shed light on this.

1600	Add a second wirebond for pad-to-channel on DIB1qI/q3. The original one looked fine, I doubt this will change anything.

1614	Removed the four 241 Am sources from Run 65 150 mm detector stack. Placed in cleanroom cabinet.

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