NEW

Renewed and improved noise thermometer.
The wiring for four Double-Channel-Squids is installed.
Two more stainless steel Coax-Cables are installed with their own port at room-temperature. The are numbered #5 and #6. Up to now they end at the mixing chamber and are connected to each other.
Two semi-rigid coax-cables were installed, too.
Filter-boxes I, II and VI were improved by adding a second coil at the input (cryo-end) of the filter circuit. The coils were manufactured by Würth Electronik, Part No. 744221, 2000 $\mu$ H; 600mA; 0.42 ${\Omega }$

TEST

07.09.2012 : Degauss FPD, see log-book at page 234.
Testing new noise thermometer ...
18.09.2012 : NEW RECORD! Due to the new filter-box design we reached an new record! The crabon thermometer mounted on the mixing chamber reached the highest resistance so far: R_MC,CT5=14.1k ${\Omega }$ . Referred to the old Bayreuth-Calibration this is about 9 mK, corresponding to a our new calibration table (see log book p.139) this is about ~6 mK. Nevertheless even this temperature seems to be too high since the RuOx-thermometer already shows a temperature below 5.9mK (lowest limit of its calibration) at ~11k ${\Omega }$ of the crabon thermometer.

30.08.2012: FIRST DAY - CLOSING, CLEANING & PRE-COOLING
- Closing cryostat and dewar. Cleaning/pumping lines.
- Exchange gas p_VC~3mbar.
- 17:57 : Pre-cooling with 50l LN.