2018/03/27 (Tuesday)
| Setup: DIB1/2 → SL 43/41 → 3.2 MHz filters → cables 3/1 → DCRC50(3)/55(1). | |
| Bias sweep overnight. Ended with bias returned to 0 and a flash. | |
| 1005 | Tower/MC/Coldplate = 36.6/30.5/187 mK, Still = 1.46 K / 0.120 mbar, G1/G2 = 167/157 mbar, 1K Pot = 1.61 K / 24 mbar. Main bath = 46.6% |
| 1010 | Fill LN2 cold trap bath. |
| 1013 | Set bias to +11 V using sequencer |
| 1013 | Start 77 min total series of +6V DCRC bias with 6 min +11V prebias manually, 1000 beginning randoms, and a 50/40/60/40 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Note, data taking includes 5min prebias time |
| 1019 | Set bias to +6 V using sequencer |
| 1130 | Set bias to 0 V using sequencer |
| 1135 | Flash for 30 seconds |
| 1159 | Start sequence of 4, 30 min series of +6V DCRC bias using takeNoflash_R67.msl, with no flash, but ground and wait 10 min between series , 1000 beginning randoms, and a 50/40/60/40 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). |
| 1203 | Raise thresholds on DCRC3qI/qO from 60/40 → 70/50. Looks like we're triggering on noise. |
| 1525 | Begin LHe transfer @ MB = 38.7% |
| 1557 | End LHe transfer @ MB = 91.3% |
| 1630 | The 1K Pot temperature/pressure has been drifting downward gradually over the last few days. And it came down a little after the LHe transfer, currently 1K Pot = 1.60 K / 22 mbar. Tweak the needle valve open a few more degrees. 1K Pot → 1.66 K / 50 mbar |
| 1638 | Start bias scan sequence of 120 min series , with DCRC bias = (3.5, 9, -3.5, -9), with 30s flash, 30min cooldown (including initial flash), 1000 beginning randoms, and a 50/40/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). |
| 1715 | Raise thresholds on DCRC3qI/qO from 70/50 → 80/60. Looks like we're triggering on noise. |
| 1716 | Fill LN2 cold trap full. |
| 1722 | Raise thresholds on DCRC1qI/qO/DCRC3qI/qO from 50/40/80/60 → 60/50/90/70. Looks like we're triggering on noise. |
| 1901 | Still triggering on noise! Sequence is almost over, try disabling DCRC3QI trigger. |
| 1907 | Still triggering on noise! Also disable DCRC3QO trigger. |
| 1914 | Stop sequence after flash at 1910. Let's try sort out the triggering remotely. |
| 1916 | Restart programs. |
| 1924 | Start 0V test series with no beginning randoms, trigger DCRC1qI/qO/DCRC3qI/qO = 60/50/off/off |
| Triggering seems to be working fine. | |
| 1929 | Start 3.5V test series with no beginning randoms, trigger DCRC1qI/qO/DCRC3qI/qO = 60/50/off/off |
| 1934 | Triggering on noise now. Disable DCRC1qO so we have: DCRC1qI/qO/DCRC3qI/qO = 60/off/off/off |
| 1939 | Still triggering on noise. Disable all triggers! DCRC1qI/qO/DCRC3qI/qO = off/off/off/off |
| 1942 | Good, no triggers. Set: DCRC1qI/qO/DCRC3qI/qO = off/off/90/off |
| 1944 | Triggering properly. Set: DCRC1qI/qO/DCRC3qI/qO = off/off/70/50 |
| 1948 | Triggering properly. Set: DCRC1qI/qO/DCRC3qI/qO = 60/off/70/50 |
| 1952 | Triggering properly. Set: DCRC1qI/qO/DCRC3qI/qO = 60/50/70/50 |
| 1954 | Noise triggers. Set: DCRC1qI/qO/DCRC3qI/qO = 60/60/70/50 |
| 1958 | Noise triggers. Set: DCRC1qI/qO/DCRC3qI/qO = 60/off/70/50 |
| 2001 | Noise triggers. Set: DCRC1qI/qO/DCRC3qI/qO = off/off/70/50. (Maybe I was too quick to check the data at 1952?) |
| 2006 | Okay, triggering properly again. Seems like DCRC1 is the culprit. Set: DCRC1qI/qO/DCRC3qI/qO = 100/off/off/off |
| 2011 | Noise triggers. Set: DCRC1qI/qO/DCRC3qI/qO = 500/off/off/off |
| 2015 | Noise triggers. Set: DCRC1qI/qO/DCRC3qI/qO = 1000/off/off/off |
| 2018 | Still noise triggers. DCRC1 seems to be stuck in one of those weird trigger states. Stop run and programs then do a software RESET on DCRC1 via telnet. |
| 2021 | Start 0V test series with no beginning randoms, trigger DCRC1qI/qO/DCRC3qI/qO = 60/off/off/off |
| Triggering works fine. | |
| 2025 | Start 3.5V test series with no beginning randoms, trigger DCRC1qI/qO/DCRC3qI/qO = 60/off/off/off |
| 2029 | Triggering properly. Set: DCRC1qI/qO/DCRC3qI/qO = 50/40/off/off |
| 2034 | Triggering properly. Set: DCRC1qI/qO/DCRC3qI/qO = 50/40/70/50 (Thresholds that we tried to start the overnight data with) |
| 2040 | Okay, it seems to be working again. Stop run, turn off bias. Not sure if there was some noise source due to the transfer that finally went away, or if DCRC1 got into a weird state and just needed a RESET. Let's try starting the sequence again. |
| 2042 | Start bias scan sequence of 120 min series , with DCRC bias = (3.5, 9, -3.5, -9), with 30s flash, 30min cooldown (including initial flash), 1000 beginning randoms, and a 50/40/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Later: All noise triggers :( |
| 2132 | Gah! Triggering on noise again. Disable DCRC1 triggers. DCRC1qI/qO/DCRC3qI/qO = off/off/70/50 |
| 2143 | Still triggering on noise… I'm not sure what's going on here. Restore DCRC1 triggers and just let the thing run. Maybe it'll work itself out via magic? |