2022/01/05 (Wednesday)
- Lab in-personnel: Matt
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board/nothing → DCRC55(1)/DCRC50(3)/DCRCx(4) Lead shield in place. Am Source y = 10.05 mm |
| 1115 | Goldman = 48.2 mK |
| We'll try a hot Al flash to see if we can fix Side2pD which seems like it may have trapped flux (very reduced phonon collection efficiency). LEDs are connected to DCRC1. Standard PulseWidth/RepRate = 100/5000. We'll increase the duty cycle by changing to 100/500. |
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| 1125 | Flash DCRC1 LEDs with rep rate reduced from 5000 to 500 for 1 minute No temperature increase… something is wrong. Current is set to 0.6 mA, lets' try -0.6 mA. |
| 1130 | Flash DCRC1 LEDs with rep rate reduced from 5000 to 500 for 1 minute, this time with -0.6 mA Still no temperature increase |
| 1135 | Tried flashing DCRC3 and DCRC4. Still nothing. |
| 1150 | OK just noticed that DAQ programs aren't running (DCRCdriver, TowerFE, TriggerFE). Must have been a crash since last night. |
| 1155 | Got DAQ programs running again (had to disable and reenable various DCRCs several times) |
| 1200 | Flash DCRC1 LEDs for 1 minute with rep rate reduced from 5000 to 500 Goldman peaks at 0.43 K |
| 1205 | Flash DCRC1 LEDs for 5 minutes with rep rate reduced from 5000 to 500 Goldman peaks at 0.49 K |
| Actually, I've been using the DCRC Control tools in the user interface to flash, and this sequence seems to set rep rate to standard 5000. So let's just turn on the LEDs “manually” at the ODB. | |
| 1215 | Turn on DCRC1 LEDs with rep rate reduced from 5000 to 500 Goldman =1.26 K after 2 minutes. Just right for driving the Al normal. Turn off LEDs after 3 minutes. Tower starts cooling. |
| 1305 | Goldman = 52 mK and cooling |
| 1400 | Restart MIDAS because I don't think everything was running - “mserver” and “lazylogger” weren't running. I couldn't get SQUIDtuningGUI.exe to connect, maybe that was why. |
| 1430 | Goldman = 49.2 mK. Adjust QET biases based on mini-IbIs trends versus temperature to target dP/dI = 1.0 uV on all channels. QET biases = 245.5/319.1/279.9/184.3/164.3/165.2/218.3/0/209.2/150.6/259.7/193.5 Adjust driver offsets so all baselines are around -0.9 to -1.0 V |
| 1429 | Start 0V data series, 36 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pB threshold 10. Start series with the Start Button. |
| 1440 | Goldman = 49.1 mK. Do in-run QET bias adjustment. QET biases = 245.8/319.3/280.3/184.6/164.6/165.5/218.4/0/209.5/150.8/260/193.8 |
| 1455 | Goldman = 49.0 mK. Do in-run QET bias adjustment. QET biases = 246/319.6/280.6/185/164.9/165.8/218.6/0/209.7/151/260.2/194.1 |
| Taking a look at this data it seems that Side2pD has recovered its PCE. The hot Al flash worked! | |
| 1535 | Goldman/Tower/MC(H35)/Coldplate = 48.9/91.3/38.2/211 mK, Still = 1.68±0.03 K / 0.120 mbar / 0 mW, G1/G2= 252/238 mbar, 1K Pot = 1.62 K / 18±1 mbar, MB = 60.4%. |
| 1540 | Fill LN2 cold trap bath |
Source position analysis:
- Comparing today's data to the y=0 data, it's clear that the source is now closer to pC and farther from pD on both sides, therefore it's in the +y direction
- Side1pC partition is higher, Side1&2pD are partition are lower. (Side2pC partition didn't change much.)
- Side1&2pC times are earlier, Side1pD time is a little later. (But Side2pD is earlier, strange.)
- We got to the current position with negative steps, so apparently -steps = +y_direction. Which is toward the far endstop. (I thought it was wired the same as Run74 but I guess not.)
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