2013/01/23

0010	Fill N2 cold trap full.
0034	Finished Tc measurements for Dib 3.
	Begin flashing detector. LEDs 1&2 on Dibs 1 & 2.

Measure Tcs for phonon channels on DIB 3 using 10 mVpp triangle wave at 100 Hz. Phonon channel B still had trapped flux, so Tc's were not collected at this time.

		Peak-to-Peak Amplitude [mV]		Tc (T increasing) [mK ± 0.2 mK]		Tc (T decreasing) [mK ± 0.2 mK]
Channel	Output Gain	Before Transition	After Transition	Start	Stop	Start	Stop
A3	5	470	31	69.1	70.8	70.2	68.4
B3	7	470	-	-	-	-	-
C3	7	650	36	74.1	74.5	74.4	73.9
D3	7	680	40	83.4	84.9	84.2	82.4

0950	Stop flashing detector (temperature was stable at 127 mK).
1002	Filled LN2 cold trap.
	Fed Cricket 4 pellets.
1017	Both DCRC32 & 33 read 0000.
	Zapping Dib 3 now. Will re-power DCRCs and zap squids on Dibs 1 and 2.
1056	All SQUIDs have been zapped and channels have been re-locked and timing link has been reset. This is somewhat frustrating to do after flashing the detectors each time (because one or both of the DCRCs we use to flash reads 0000) because it's at least 40 minute process to go to the next step (not including the time it took to cool down from flashing). Mixing chamber temperature is 52.1 mK and still decreasing.
1130	Mixing chamber temperature: 51.4 mK.
1232	Finished charge breakdown studies between Qi and Qo on Side 2 (with side 1 grounded) where Qi has positive bias and Qo is at 0 V. At +8 V, I started to increase the bias in 0.5 V increments. At 8 and 9 V, there were very slight signs of charge breakdown on Dib 1 on channels A and D. At 9.5 V, Dib 3 Ch. C showed very slight signs, and Qo's signal on Dib 2 started to look a little worse. At 10 V there was clear charge breakdown on board 33 for ch.'s A and D (D more often). 31C (convention stands for DCRC#Channel_Letter) also showed clearer signs of charge breakdown, 31B slightly did. 32D started to show signs.
	Flashed Dib2, LEDS 1&2, for 10 seconds. Board is still connected.
1422	Finished charge breakdown studies between Qi and Qo on Side 2 (with side 1 grounded) where Qo has positive bias and Qi is at 0 V. No charge breakdown was detected from 0 to 13 V bias.
	Flashed Dib2, LEDS 1&2, for 10 seconds. Board is still connected.
1543	Finished charge breakdown studies between Qi and Qo on Side 2 (with side 1 grounded) where Qi has negative bias and Qo is at 0 V. No charge breakdown was detected from 0 to 13 V bias.
	Flashed Dib2, LEDS 1&2, for 10 seconds. Board is still connected.
	Flashed Dib1, LEDS 1&2, for 5 seconds. Board 33 is still connected.
1809	Fed Cricket 4 pellets.
1848	Finished charge breakdown studies between Qi and Qo on Side 2 (with side 1 grounded) where Qo has negative bias and Qi is at 0 V. Charge breakdown hints were detected at -11 V on 31C. At -12 V the charge breakdown was clear on channels 33 A and D (on Dib 1). Example of charge breakdown is in Figure 1.
1853	Start flashing with Dib 1, LEDs 1 & 2.
1855	This flashing seems to work. Fridge is currently at 106 mK and rising.
1857	Start flashing with Dib 2, LEDs 1 & 2.
	Temperature is going above 127 mK. This is a good sign.
1901	Fill LN2 cold trap.

Figure 1: DCRC33 - Dib 1 - Channel D: After (-12 V) and Before (-11.5 V) Charge Breakdown