| | Setup: DIB1/2 → SL 43/41 → 3.2 MHz filters → cables 3/1 → DCRC50(3)/55(1). |
| | Overnight: Flash and take a set of 8V series. Last flash was at 0023 this morning. Tower01 is currently crashed though… |
| | We ran a flash and take sequence last night of 8, 8V series. Data looks good in the first 5 series, but dumps are empty starting with dump 35 of 07180329_2136. MIDAS error messages indicate that towerfe3_01 crashed around 2211 |
| 0940 | Tower/MC/Coldplate = 36.2/32.2/191 mK, Still = 1.34 K / 0.085 mbar, G1/G2 = 138/125 mbar, 1K Pot = 1.38 K / 2.2 mbar. Main bath = 70.9% |
| 0945 | Tweak 1K Pot needle valve open a few more degrees. 1K Pot spikes to → 1.75 K / >400 mbar in a few seconds! Tweak 1K Pot needle valve closed a few degrees. 1K Pot oscillates around → 1.58 K / 12 mbar |
| 0949 | Fill LN2 cold trap. |
| 1006 | Return 133Ba source to safe. |
| 1008 | Restart DCRC programs. |
| 1009 | 1K Pot → 1.52 K / 7 mbar |
| 1010 | Tweak 1K Pot needle valve open a few more degrees. 1K Pot → 1.57 K / 13 mbar |
| 1031:35 | Start 68 min series with initial DCRC bias = 0 V, 1000 beginning randoms, and a 70/60/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering |
| 1034:20 | Set DCRC bias = 8V using set_DCRC_bias.msl |
| 1139 | Stop run |
| 1140:59 | Start 30 min series with initial DCRC bias = 8 V, 1000 beginning randoms, and a 70/60/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering |
| 1155 | Set DCRC bias = 0V using set_DCRC_bias.msl |
| 1225 | Look for breakdown. Step up bias from 0 to 5 to 10 to 13. At 13 we saw breakdown. Then stepped back, 11 to 12 to 13. 11 and 12 showed no breakdown; 13 this time showed some hairy noise, partial breakdown. Then back to 10 then to 13. This time 13 showed no breakdown at all. Could be that after a certain time biased, the detector is less susceptible to breakdown. |
| 1225 | 1K Pot fell to 4 mbar, tweak needle valve again. Settles around 20 mbar but falls again. |
| 1230 | Ground detector and flash for 30 s |
| 1310 | 1K Pot has fallen to 5 mbar, tweak needle valve again. Settles around 26 mbar. |
| 1350 | Dial up MC heater to 100 uW over about half an hour. Tower settles at about 130 mK |
| 1352 | Start 35 min series at 8 V, Tower = 124-135 mK, 1000 beginning randoms, and a 70/60/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering. |
| 1415 | 1K Pot has fallen to 5.5 mbar, tweak needle valve again. Settles around 20 mbar. |
| 1415 | Pot tweak caused a cooling trend, Tower = 134 mK but falling |
| 1425 | Tower = 124 mK |
| 1430 | Stop data, ground detector, flash for 30 seconds |
| 1440 | Tower falls to 127 mK then starts rising |
| 1514 | Tower = 137 mK |
| 1514 | Start 48 min series at 8 V, Tower = 138-126 mK, 1000 beginning randoms, and a 70/60/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering. |
| 1515 | 1K Pot has fallen to 5.0 mbar, tweak needle valve again. Settles around 25 mbar. |
| 1605 | Stop data, ground detector |
| 1605 | Turn off MC heater (was at 100 uW) |
| 1610 | 1K Pot has fallen to 9.5 mbar, tweak needle valve again. Settles around 25 mbar. |
| 1620 | Tower = 42.0 mK |
| 1625 | Flash detector for 10 seconds |
| 1640 | Look for breakdown again, with reasonably well-neutralized detector. Try 13 V and -13 V. Actually doesn't seem to break down in either case. |
| 1645 | Set bias to 10V. Will leave for 10 minutes or so to get the detector out of its early state. |
| 1705 | Detector has been at 10V for 20 min. Try 13 V : no breakdown. Go to 0V, then -13 V : no breakdown. |
| 1713 | Remove 133Ba fro safe and place in castle near fridge. |
| 1714 | Start Sequence of 8 45 min Ba series using flashandtake_R67.msl, with DCRC bias = -8 V, with 30s flash, 15min cooldown, 1000 beginning randoms, and a 60/50/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering |
| 1715 | Fill LN2 cold trap |
| 1716 | 1K Pot has fallen to 9.5 mbar, tweak needle valve again. |