2023/03/01 (Wednesday)
* Lab in-personnel: Himangshu
| 1333 | MC(H35) = 5.54 K, G1/G2 = 543/503 mbar, MB = -1.0% |
|---|---|
| 1606 | Started LN2 refill for cold trap 1 |
| 1600 | When Plugged Cable 3 on DCRC1, Channel B shows response to QET bias which it doesn't show for DCRC4. Channel A on Cable 3 donot show squid modulation, but shows response to QET bias change. |
| 1637 | Checking Motor Coil Resistance Coil_Pin1-2: 30 ohm, Coil_Pin3-4: 21 ohm. |
| During bench test, this resistance was 85.7 ohm on both coils. Connect 4 resistors with R ~ 23 ohm to make Coil_Pin1-2: 73 ohm and Coil_Pin3-4: 65 ohm, close to the bench test resistance. | |
| 1757 | Started one dataset with no pulses, to note down the change in baseline when we test the source mover. |
| MC(H35) = 33 mK, Tower(Rox) = 73 mK | |
| 1755 | Resistor Pin1= 15.2 ohm. No voltage or current output yet. Set Absolute position. No change. |
| 1807 | Making first move. X=-16, Y=64 . this will try to move the Y arm by 60 degrees. MC(H35) = 34 mK, Tower(Rox) = 85.2 mK. Making a move now. No movement(change in current/voltage) or temp change observed. Checking connections. |
| 1837 | Redid all connections, not using the second Fluke this time. The ammeter current will give current in Pin 1 line. |
| Turning on the power drives 70 mA current in the line which dies down very quickly. | |
| 1841 | MC reading 50 mK and cooling, Rox at 113 mK and cooling. Waiting to settle down |
| 1842 | With settled MC at 35 mK, making the move (X= -16 –> -16, Y= 96 –> 64). Current keep fluctuating between 50 mA to 75 mA, MC went up to 828 mK, tower Rox 2.52 K. |
| 1846 | No change in current, but MC showing another wave to 1.13 K (Tower 1.92 K). Turn off source mover circuit |