Revision as of 16:49, 17 September 2012

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 ${\Omega }$

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.

29.02.2012: SECOND DAY - LIQUID HELIUM
- 09:00 : Status = T_Dewar=155K, T_Magn,l=152K, p_VC=0.78mbar
- 10:00 : Start filling LHe
- 15:10 : During 3rd can (after ~ 230 LHe in total) T_RuOx=4.6K, p_VC=3.3*10^-3<\sup>mbar

05.03.2012: 1^st RAMP MAGNET
- Satus : Heat switch is closed.
- 12:40 : I_M= 40 A, heat switch closed (1,5 A)

07.03.2012: 1^st DEMAG
- 11:04 : Open HS, T_i= 19.6 mK (corresponding to Noise Thermometer), B_i= 3.96 T
- 19:06 : I_M= 0.6 A, T_NMR ~ 389 uK, NT was disturbed by additional noise contribution in the frequency spectrum.

PLM-4 display shows temperature after demag (Curie-Mode)(14.03.12).

14.03.2012: 2^nd DEMAG
- ! Changed setup of PLM-4! See NMR-textbook page 23
- 11:04 : Open HS, T_i= 14.95 mK (corresponding to Noise Thermometer), B_i= 3.96 T
- 19:06 : I_M= 0.1 A, T_NT ~ 300uK ( caused by disturbances !!! ), T_NMR ~ 85 $\mu$ K (!!!) in Curie Mode.

17.03.2012: 3^rd RAMP MAGNET
- 13:05 : Closing heat switch.
- 13:38 : I_M= 40 A, heat switch closed (1,5 A)

21.03.2012: 3^rd DEMAG
- 10:43 : Open HS, T_i= 19.23 mK (corresponding to Noise Thermometer), T_NMR= 19.045 mK, B_i= 3.96 T
- 10:59 : Start Demag: T_NT= 17.80 mK
- 16:16 : Stop Noise-Thermometer read-out due to massive external distributions by additional noise (SQUID-Radio Moscow :) ).
- 18:50 : I_M= 0.3 A, T_NMR ~ 240 $\mu$ K in Curie Mode.

22.03.2012: MIX OUT
- Some rf-heating tests
- 14:30 : Start putting mix in tank 1 and 2.
- 18:00 : After using babypump :T₁=688mbar, T₂=700mbar, T₃=0mbar, p₄=1032mbar.
- ALL MIX IS DUMPED IN OUR TANKS

@@ Line 19: / Line 19: @@
 =TIME TABLE=
-* 28.02.2012: FIRST DAY - CLOSING, CLEANING & PRECOOLING
+* 30.08.2012: FIRST DAY - CLOSING, CLEANING & PRE-COOLING
-** Closing cyrostat and dewar. Cleaning/pumping lines.
+** Closing cryostat and dewar. Cleaning/pumping lines.
+** Exchange gas p<sub>VC</sub>~3mbar.
-** Precooling with 50l LN.
+** 17:57 : Pre-cooling with 50l LN.
 * 29.02.2012: SECOND DAY - LIQUID HELIUM
-** 07:50 : Status = T<sub>Dewar</sub>=207K, T<sub>MC,Si</sub>=216K, T<sub>Magn,l</sub>=217K, p<sub>VC</sub>=2.15mbar
+** 09:00 : Status = T<sub>Dewar</sub>=155K, T<sub>Magn,l</sub>=152K, p<sub>VC</sub>=0.78mbar
-** 09:55 : Start filling LHe
+** 10:00 : Start filling LHe
-** 17:00 : Status after two cans ('''188.8l LHe''') =T<sub>MC,Si</sub>=80K, T<sub>Magn,u</sub>=50K, p<sub>VC</sub>=0.45mbar
+** 15:10 : During 3rd can (after ~ 230 LHe in total) T<sub>RuOx</sub>=4.6K,  p<sub>VC</sub>=3.3*10<sup>-3<\sup>mbar