UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20160609

2016/06/09 (Thursday)

Previous Day

Setup DIB1/2 → cables → Dsub filters → DCRC55/50. DCRCs powered.
taking 30-min data series overnight of charge bias sweeps. Last flash at 0820.
0900 Tower temperature: 47.3 mK, G1=85.1 mbar, G2=88.1 mbar, P1=75 ubar, MC temperature: 1.44 K, P2=1.9 mbar. Prepare to adjust 1 K Pot valve at next flash.
0901 Fill LN2 coldtrap.
0935 Open 1K Pot Needle valve a 16th of a turn. Temperature increases to ~1.98K before dropping back down. Oscillating around 1.87K. May be too open. Will adjust in five minutes if need be.
0945 1K Pot temperature at 1.74K and 55mbar on P2. Still gradually dropping, but whaddya gonna dew? Base temperature seems to be lower now that we've adjusted the 1K Pot. Overnight during each series, the base temperature was slightly higher each time: increasing from 45mK to 47mK. After adjusting the 1K Pot, the base temperature has fallen back to ~45mK.
1310 Data taking script finished. Tower temperature at 42.9mK. QBias correctly set back to 0V after data taking. 1K Pot temperature at 1.57K and P2 reading 6.0mbar. Will have to adjust needle valve soon.
1312 Start 4 hours of 30 min background series bias sweeps at -/-10 V to -/-13 V in increments of 1 V with 30s flash and 25min cooldown in between. Triggering on DIB1 Qo at 40ADC bins. 1000 randoms before and after.
1701 Sequence finished. Taking a look at the channels, all of them seem to be triggering nicely on the pulses when manually applying a Qbias. For overnight we'll test neutralization with 2-hour series at -/-4V this time.
1703 Fill LN2 cold trap full. Tower temperature currently at 43.7mK. 1K Pot at 1.54K and P2 shows 5.0mbar. Open 1K Pot needle valve 16th of a turn to prep for overnight. 1K Pot reaches 1.88K, then begins decreasing.
1705 Start 15 hours of 120min background series at -/-4 V with 2min flash and 28min cooldown in between. Triggering on DIB1 Qo at 40ADC bins. 1000 randoms before and after.
2017 P2 at 7 mbar. Open 1K Pot needle valve slightly (<16th of a turn) during flashing. After a minute or so, P2 at 55.0 mbar 1K Pot temperature at 1.762 mbar and both dropping slowly. Hopefully this will last overnight.

Next Day