| Status | Run 74 in progress. First cooldown after IVC rebuild. |
| | Tower thermometer is reading high, probably this is a thermometer problem and the actual temperature is much lower. High noise in some of the charge channels. |
| | Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. Currently both DCRCs are on. |
| | Position of Am source: y = 0.00 mm |
| 0908 | Tower/MC/Coldplate = 109.9/35.5/ 190.6 mK, Still = 1.35 K / 0.075 mbar / 0 mW, G1/G2= 280.1/253.4 mbar, 1K Pot = 1.59 K / 20±1 mbar. MB = 72.4%. |
| 0921 | Fill LN2 cold bath. |
| 1115 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 24/4.0/2.3/43 8e-6. This is q3/q1/q4/q2
At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 660/69/60/1500e-6 |
| | Noise at 10kHz is a little lower today but 3kHz oscillation is higher today than yesterday |
| 1125 | Place Na-22 source in lead castle at detector level 80 cm from detector center (54.5 cm from mu-metal). |
| 1129 | Start 50 min series of 0V/-12V (bias applied after 60 sec), with Na-22 source at 80 cm, with 1000 beginning randoms, trigger threshold 120/40/60/200 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length).
Start sequence with Start button. |
| 1222 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
