Heike R2012-02 R66: Difference between revisions

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* Pt-NMR read-out via two s.s. mini-coax. Signal Coil is connected with port #1 and #3.
* Pt-NMR read-out via two s.s. mini-coax. Signal Coil is connected with port #1 and #3.
* Different capacitances two improve the NMR tank-circuit.


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=TEST=
=TEST=
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* Heating by RF-Signal causes a significant parasitic heat input on the mixing chamber and on the Cu-Stage. Several tests were done to prove this. See e.g. logbook: 16.03. or 22.03.2012.
* Heating by RF-Signal causes a significant parasitic heat input on the mixing chamber and on the Cu-Stage. Several tests were done to prove this. See e.g. logbook: 16.03. or 22.03.2012.


* '''NEW LOWEST TEMPERATURE ACHIEVED''':
* '''NEW LOWEST TEMPERATURE ACHIEVED''': '''T<sub>NMR</sub> ~ 85 {{u}}K''' (14.03.)

* New Filter-Design for some Boxes.




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* 01.03.2012: THIRD DAY - MIX IN
* 01.03.2012: 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
** 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
** 11:45 : T<sub>MC,Si</sub>=4K, start pumping vacuum vessel.
** 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.
** 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'''.
** 14:10 : 100% He-Level. Total consumption to reach this level: '''428.2 litres''' (Five cans) .
** 14:10 : 100% He-Level. Total consumption to reach this level: '''428.2 litres''' (Five cans) .
** 16:20 : Close Heat-Switch (I<sub>PCS#4</sub>=1.5A, I<sub>H</sub>=0.5mA) @ T<sub>RuOx</sub>=700mK
** 16:20 : Close Heat-Switch (I<sub>PCS#4</sub>=1.5A, I<sub>H</sub>=0.5mA) @ T<sub>RuOx</sub>=700mK
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** 10:59 : Start Demag: T<sub>NT</sub>= 17.80 mK
** 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 :) ).
** 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}}Kin Curie Mode.
** 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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=TO DO=

* Find correct setup of the PLM-4 Korringa-Mode.
* Improve Filter-Design!
* Reduce parasitic heating by rf-signals.
* Get rid of SQUID-Radio Moscow :)
* Remove partially plugged flow of cooling water

Latest revision as of 09:17, 23 March 2012

NEW

  • Pt-NMR read-out via two s.s. mini-coax. Signal Coil is connected with port #1 and #3.
  • Different capacitances two improve the NMR tank-circuit.


TEST

  • Testing Pt-NMR. Coax #1 and #3 is connected with a special box. Inside this box the inner conductor of coax #1 is grounded and the inner conductor of #3 is feed through. For details see Pt-NMR Log-Book page 20. At first glance it seems like the device works at Curie-Mode.
  • In spite of many attempts with different setups it isn't possible to measure in the Korringa-Mode with the PLM-4 so far.
  • Heating by RF-Signal causes a significant parasitic heat input on the mixing chamber and on the Cu-Stage. Several tests were done to prove this. See e.g. logbook: 16.03. or 22.03.2012.
  • NEW LOWEST TEMPERATURE ACHIEVED: TNMR ~ 85 K (14.03.)
  • New Filter-Design for some Boxes.


TIME TABLE

Icy transfer tube with a sub-prime vacuum :)
  • 28.02.2012: FIRST DAY - CLOSING, CLEANING & PRECOOLING
    • Closing cyrostat and dewar. Cleaning/pumping lines.
    • Precooling with 50l LN.


  • 29.02.2012: SECOND DAY - LIQUID HELIUM
    • 07:50 : Status = TDewar=207K, TMC,Si=216K, TMagn,l=217K, pVC=2.15mbar
    • 09:55 : Start filling LHe
    • 17:00 : Status after two cans (188.8l LHe) =TMC,Si=80K, TMagn,u=50K, pVC=0.45mbar


  • 01.03.2012: THIRD DAY - MIX IN
    • 08:00 : Status = TDewar=78K, TMC,Si=80K, TMagn,u=81K, pVC=0.67mbar, connect 3rd can LHe
    • 11:45 : TMC,Si=4K, start pumping vacuum vessel.
    • 14:00 : Start condensing mix. T1=688mbar, T2=700mbar, T3=0mbar, p4=774mbar.
    • 14:10 : 100% He-Level. Total consumption to reach this level: 428.2 litres (Five cans) .
    • 16:20 : Close Heat-Switch (IPCS#4=1.5A, IH=0.5mA) @ TRuOx=700mK
    • 17:20 : All mix is in, all pumps are running. ISTILL=3.0mA, TRuOx=90mK


  • 02.03.2012: 4th DAY
    • Testing FPD
    • Connecting and Testing Pt-NMR


  • 05.03.2012: 1st RAMP MAGNET
    • Satus : Heat switch is closed.
    • 12:40 : IM= 40 A, heat switch closed (1,5 A)
  • 07.03.2012: 1st DEMAG
    • 11:04 : Open HS, Ti= 19.6 mK (corresponding to Noise Thermometer), Bi= 3.96 T
    • 19:06 : IM= 0.6 A, TNMR ~ 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).
  • 08.03.2012: 2nd RAMP MAGNET
    • 12:00 : IM= 40 A, heat switch closed (1,5 A)
  • 14.03.2012: 2nd DEMAG
    • ! Changed setup of PLM-4! See NMR-textbook page 23
    • 11:04 : Open HS, Ti= 14.95 mK (corresponding to Noise Thermometer), Bi= 3.96 T
    • 19:06 : IM= 0.1 A, TNT ~ 300uK ( caused by disturbances !!! ), TNMR ~ 85 K (!!!) in Curie Mode.


  • 17.03.2012: 3rd RAMP MAGNET
    • 13:05 : Closing heat switch.
    • 13:38 : IM= 40 A, heat switch closed (1,5 A)
  • 21.03.2012: 3rd DEMAG
    • 10:43 : Open HS, Ti= 19.23 mK (corresponding to Noise Thermometer), TNMR= 19.045 mK, Bi= 3.96 T
    • 10:59 : Start Demag: TNT= 17.80 mK
    • 16:16 : Stop Noise-Thermometer read-out due to massive external distributions by additional noise (SQUID-Radio Moscow :) ).
    • 18:50 : IM= 0.3 A, TNMR ~ 240 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


TO DO

  • Find correct setup of the PLM-4 Korringa-Mode.
  • Improve Filter-Design!
  • Reduce parasitic heating by rf-signals.
  • Get rid of SQUID-Radio Moscow :)
  • Remove partially plugged flow of cooling water
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