Heike R2012-09 R67: Difference between revisions

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* 29.02.2012: SECOND DAY - LIQUID HELIUM
* 31.08.2012: SECOND DAY - LIQUID HELIUM
** 09:00 : Status = T<sub>Dewar</sub>=155K, T<sub>Magn,l</sub>=152K, p<sub>VC</sub>=0.78mbar
** 09:00 : Status = T<sub>Dewar</sub>=155K, T<sub>Magn,l</sub>=152K, p<sub>VC</sub>=0.78mbar
** 10:00 : Start filling LHe
** 10:00 : Start filling LHe
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* 01.03.2012: THIRD DAY - '''MIX IN'''
* 07.09.2012: THIRD DAY - '''MIX IN'''
** 08:00 : Status = T<sub>Dewar</sub>=78K, T<sub>MC,Si</sub>=80K, T<sub>Magn,u</sub>=81K, p<sub>VC</sub>=0.67mbar, connect 3<sup>rd</sup> can LHe
** 09:25 : Status = p<sub>VC</sub>=2.9*10<sup>-5</sup>mbar, T<sub>MC,RuOx</sub>=4.08, T<sub>MC.Si</sub>=4.17K
⚫
** 09:40 : Start condensing mix. '''T<sub>1</sub>=683mbar, T<sub>2</sub>=695mbar, T<sub>3</sub>=0mbar, p<sub>4</sub>=973mbar'''.
** 11:45 : T<sub>MC,Si</sub>=4K, start pumping vacuum vessel.
** 14:00 : Start condensing mix. '''T<sub>1</sub>=688mbar, T<sub>2</sub>=700mbar, T<sub>3</sub>=0mbar, p<sub>4</sub>=774mbar'''.
** 12:30 : Close Heat-Switch (I<sub>PCS#4</sub>=1.5A, I<sub>H</sub>=0.5mA) @ T<sub>RuOx</sub>=600mK
⚫
** 12:40 : I<sub>Still</sub>=3.0mA, T<sub>RuOx</sub>=580mK
** 14:10 : 100% He-Level. Total consumption to reach this level: '''428.2 litres''' (Five cans) .
** 14:30 : All mix is in, all pumps are running.
** 16:20 : Close Heat-Switch (I<sub>PCS#4</sub>=1.5A, I<sub>H</sub>=0.5mA) @ T<sub>RuOx</sub>=700mK
⚫
** 17:20 : All mix is in, all pumps are running. I<sub>STILL</sub>=3.0mA, T<sub>RuOx</sub>=90mK


* 02.03.2012: 4<sup>th</sup> DAY
** Testing FPD
** Connecting and Testing Pt-NMR


* 05.03.2012: 1<sup>st</sup> RAMP MAGNET
** Satus : Heat switch is closed.
** 12:40 : I<sub>M</sub>= 40 A, heat switch closed (1,5 A)

* 07.03.2012: '''1<sup>st</sup> DEMAG'''
** 11:04 : Open HS, T<sub>i</sub>= 19.6 mK (corresponding to Noise Thermometer), B<sub>i</sub>= 3.96 T
** 19:06 : I<sub>M</sub>= 0.6 A, T<sub>NMR</sub> ~ 389 uK, NT was disturbed by additional noise contribution in the frequency spectrum.


[[Image:Pt-NMR_94uK.jpg|right|thumb|200px|PLM-4 display shows temperature after demag (Curie-Mode)(14.03.12).]]
* 08.03.2012: 2<sup>nd</sup> RAMP MAGNET
** 12:00 : I<sub>M</sub>= 40 A, heat switch closed (1,5 A)

* 14.03.2012: '''2<sup>nd</sup> DEMAG'''
** ! Changed setup of PLM-4! See NMR-textbook page 23
** 11:04 : Open HS, T<sub>i</sub>= 14.95 mK (corresponding to Noise Thermometer), B<sub>i</sub>= 3.96 T
** 19:06 : I<sub>M</sub>= 0.1 A, T<sub>NT</sub> ~ 300uK ( caused by disturbances !!! ), '''T<sub>NMR</sub> ~ 85 {{u}}K''' (!!!) in Curie Mode.


* 17.03.2012: 3<sup>rd</sup> RAMP MAGNET
** 13:05 : Closing heat switch.
** 13:38 : I<sub>M</sub>= 40 A, heat switch closed (1,5 A)

* 21.03.2012: '''3<sup>rd</sup> DEMAG'''
** 10:43 : Open HS, T<sub>i</sub>= 19.23 mK (corresponding to Noise Thermometer), T<sub>NMR</sub>= 19.045 mK, B<sub>i</sub>= 3.96 T
** 10:59 : Start Demag: T<sub>NT</sub>= 17.80 mK
** 16:16 : Stop Noise-Thermometer read-out due to massive external distributions by additional noise (SQUID-Radio Moscow :) ).
** 18:50 : I<sub>M</sub>= 0.3 A, T<sub>NMR</sub> ~ 240 {{u}}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 :'''T<sub>1</sub>=688mbar, T<sub>2</sub>=700mbar, T<sub>3</sub>=0mbar, p<sub>4</sub>=1032mbar'''.
** ALL MIX IS DUMPED IN OUR TANKS




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Revision as of 16:57, 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, 2000H; 600mA; 0.42


TEST

  • Testing new noise thermometer ...

TIME TABLE

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


  • 31.08.2012: SECOND DAY - LIQUID HELIUM
    • 09:00 : Status = TDewar=155K, TMagn,l=152K, pVC=0.78mbar
    • 10:00 : Start filling LHe
    • 15:10 : During 3rd can (after ~ 230 LHe in total): TRuOx=4.6K, pVC=3.3*10-3mbar
    • 15:58 : Pump VC
    • 17:15 : He 100%, LHe in total ~318l
    • 18:45 : Stop pumping VC, pVC=4.7*10-5mbar


  • 07.09.2012: THIRD DAY - MIX IN
    • 09:25 : Status = pVC=2.9*10-5mbar, TMC,RuOx=4.08, TMC.Si=4.17K
    • 09:40 : Start condensing mix. T1=683mbar, T2=695mbar, T3=0mbar, p4=973mbar.
    • 12:30 : Close Heat-Switch (IPCS#4=1.5A, IH=0.5mA) @ TRuOx=600mK
    • 12:40 : IStill=3.0mA, TRuOx=580mK
    • 14:30 : All mix is in, all pumps are running.

TO DO

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