2009/12/08

Run diary

Time	Task
08:42	Set Qi = 0.05 V (x2020) and Qo = -0.04 V (x1FE6) to zero the bias; Turn on FET heater.
08:45	Turn off heater at FET T = 0.893. Charge channels are on. MC temperature starts to go up from 33.5 mK.
08:49	East lights off. Fridge grounded to orange ground. MC T = 34.3 mK. Take noise traces of Qi and Qo: run001 and run002.
08:51	Ground fridge to Cu rod. MC T = 34.6 mK. Qi run003
08:52	Qo run004
08:54	Ground to black ground. MC T = 35.1 mK. Qi spd run005
08:55	Qo psd run006

plot of run001, 3, and 5
matlab .fig file
plot of run002, 4, and 6
matlab .fig file
All peaks overlap. There is no essential difference between different grounds. Low frequency base line difference are due to pulses.

Time	Task
09:53	Take Qi noise psd with an without LS370 connected. run007 and run008.

plot of run007 and run008
matlab .fig file
All peaks overlap.

Time	Task
16:12	Turn everything off and see the effect on charge noise psd. Take run009 to 011.

Plot of run009 to 011
matlab .fig file
The blue curve is a repetition of the green. Temperature may change between them since pumps are off. Can not see the effects of the electronics we can turn off.

Time	Task
11:00	Disconnect DCRC and solder wires on LED 1 and 2.
11:46	Plug in DCRC.
13:09	Tune SQUID, zero phonon and charge biases.

Channel	FE Gain	Output Gain	Feedback Null (mV)	Driver Offset (V)	SQUID Bias (uA)	Lockpoint (mV)	QET Bias (uA)
A	0	1	0.02	0.02	90.01	3.20	36.9
B	0	1	0.02	0.00	80.93	2.40	0.6
C	0	1	0.02	0.00	76.34	2.38	-0.1
D	0	1	0.02	0.02	69.01	1.72	1.5

Qi (V)	0.05 (x2020)
Qo (V)	-0.04 (x1EF6)

Phonon modulation curves with (16432, 42) test signal and above settings

LED Current Settings
4095 = Full range 10 mA. Polarity is negative on DCRC v1.

Time	Task
13:22	Close loop to non-inverting. Set FE gain = 1 for all channels and turn off test signal.
13:26	Start to flash the LED's. First try single shot mode and monitor the output.
13:31	Try LED 1 only. I = 400 uA (164/4095); ON = 50 us; OFF = 2500 us. MC T = 33.3 mK.
13:37	Flash continuously. Turn LED 1 on and off, no change on the bias voltage.
15:22	Turn on flashing and wait for a few minutes, fridge temperature doesn't change. Suspect flashing doesn't work.
16:31	Tried the newest version of detector control vi. Flashing doesn't work either.

Data List