2012/10/01

0005	Isolate dump. Pressure of mixture remaining in dump 379 mbar.
0025	Valve V12A on IGH fully open. Have been adjusting needle valve during condensation procedure: temperature of 1 K pot 1.88 K. Mixing chamber temperature 5.9 K and falling.
0240	Mixing chamber temperature 2.6 K. Reduce 1 K pot temperature to 1.76 K.
0305	Mixing chamber temperature 2.2 K. Reduce 1 K pot temperature to 1.71 K.
	Fill N2 cold trap full.
0310	G1 & G2 pressures are between 60 and 70 mbar. Most of the mixture has condensed. Start automated circulation procedure.
0450	Mixing chamber temperature 63.8 mK. Stop automated circulation procedure. Pressures in P1, G1 & G2 are 0.06 mbar, 51 mbar & 60 mbar respectively. Rate of cooling has slowed down, but temperature still seems to be decreasing. The still pressure appears to indicate that it may be running dry. Adding more mixture may help. It may be worth being greedy and playing around with settings to see if we can drive the temperature lower. Good news so far though - let's hope it lasts.
1322	Cursory electrical check
	Dib 1 SQUID bias B/Ret : 99 Ohms Qi bias/QET Ret: < 1 nS
	Dib 2 Qi bias/QET Ret: < 1 nS Qo bias/QET Ret: < 1 nS
1330	Filled LN2 cold trap.
1656	Still: 4.47 kOhms ; Cold plate: 14.6 kOhms
1930	Plug DCRC33 into DIB 1. Temperature increases a little (~1 mK) before falling again.
2010	Plug DCRC32 into DIB 2. Temperature increases a little (~1 mK) before falling again.
	Base temperature appears to have stabilised at 62.5 mK.
2340	Start flashing detector: LED 2 on DIB1; and LEDs 1 & 2 on DIB2. Usual settings.