Heike R2014-00 R68: Difference between revisions

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First RUN since more than one year
First RUN since more than one year!!!

= NEW =

* New '''Switch & Relay Box''' for a easier and better operation of the persistent current switches of the current lines and both magnets.

* HF coax wiring for the '''Paddle experiment''': Two Semi rigid coax cables(Type: SC-160/50-NbTi-NbTi) connecting the experiment mounted underneath the Cu-Stage with the heat sinks at the mixing chamber (Coax #5 & #6). With the help of an "extender", made of a long silver rod, the experiment is placed in the centre of the lower magnet and can be exposed to a magnetic field up to 9T.

* HF coax wiring for the '''Echo experiment''' leading from the heat sink at 4K (Coax #2 & #4) to a heat sink at the mixing chamber. The Echo Experiment is mounted on the top side of the Cu-Stage and connected with superconducting semi rigid coax cables (Type: SC-160/50-NbTi-NbTi) with this heat sink.


{{clear}}

= EXPERIMENTS =

* '''Thermometry:''' Noise Thermometer and Pt-NMR Thermometer
* '''Paddle Experiment:''' Zr<sub>55</sub>Cu<sub>30</sub>Al<sub>10</sub>Ni<sub>5</sub> (M. Hempel)
* '''Echo Experiment:''' BK-7 (M. Wolter)


{{clear}}

=TEST=

*
*
*



{{clear}}

=TIME TABLE=

[[Image:W3e.jpg|right|thumb|150px|Bottles of Antikal.]]
[[Image:Dirt_00.jpg|right|thumb|150px|Bigger than 5Āµ!.]]
[[Image:Dirt_01.jpg|right|thumb|150px|Cheers!.]]

* 28.01.2014: FIRST DAY - CLOSING
** Closing cryostat.
** 15:30 : Start pumping VC with VP.
** 17:40 : Stop pumping VC, VP off: p<sub>VC</sub>~0.3mbar. Close valves, stop pump.



* 29.01.2014 : SECOND DAY - CLEANING & LEAK TEST
** 08:30 : p<sub>VC</sub>~3.2mbar.
** 09:45 : Start pumping VC again for leak testing.
** 10:30 : Cleaning cooling water circulation since it's blocked again ... :( (see photos on the right!)
** 14:50 : Leak Test: Q<sub>L</sub><10<sup>-10</sup>mbar*l/sec (with DP running)
** 15:00 : Cleaning/pumping lines.
** 16:00 : Start pumping VC with DP
** 19:00 : Stop pumping VC, DP off: 2*10<sup>-3</sup>mbar



* 31.01.2014 : THIRD DAY - CLOSING DEWAR, MOUNTING MAGNET
** TEST PADDLE EXPERIMENT: working! See resonance at room temperature!



* 3.02.2014: FOURTH DAY - PRECOOLING WITH LN
** 08:30 : Start cleaning circulation line, start pumping VC for exchange gas
** 10:15 : Stop pumping circulation line. Start pumping both cold traps. p<sub>VC</sub>~3*10<sup>-3</sup>mbar. Cleaning 1K-pot & Dewar.
** 10:45 : p<sub>VC</sub>~3*10<sup>-3</sup>mbar. Then fill in exchange gas to 3 mbar.
** 11:12 : Start filling LN ('''60l can''')
** 16:30 : T<sub>Si</sub>~209 K, T<sub>Magn,top</sub>~189 K, T<sub>Dewar</sub>~78 K, p<sub>VC</sub>=1.7 mbar
** Continue filling LN overnight...



* 4.02.2014: FIFTH DAY - FILLING LH
** 08:20 : T<sub>Si</sub>~130 K, T<sub>Magn,top</sub>~131 K, T<sub>Dewar</sub>~131 K, p<sub>VC</sub>=1.1 mbar. Start pumping nitrogen and clean with helium gas. Do not forget to clean 1K pot!
** 09:40 : 1<sup>st</sup> He can --> ~68l
** 11:45 : 2<sup>nd</sup> He can --> ~95.2l. T<sub>Si</sub>~80 K, T<sub>Magn,top</sub>~50 K, T<sub>Dewar</sub>~10 K, p<sub>VC</sub>=4.5*10<sup>-1</sup>mbar.
** 12:35 : T<sub>Dewar</sub>~4 K, T<sub>Si</sub>~63 K. Switch off 1K-Pot pump and close 1K2, 1K3.
** 13:40 : T<sub>Si</sub>~4 K. Pump VC (14:00)
** 14:37 : 3<sup>rd</sup> He can --> ~88l.
** 16:10 : 4<sup>th</sup> He can --> ~46l.

'''Total helium consumption: ~297.2l'''


* 5.02.2014: SIXTH DAY - TESTING MAGNET
** 08:00 : T<sub>Si</sub>~4.85 K, p<sub>VC</sub>=1*10<sup>-5</sup>mbar. He level ~48%
** 08:18 : Close VC1, switch off DP.
** 08:50 : Close VC3 & VC4, switch off FP2.



* XX.XX.2014: THIRD DAY - '''MIX IN'''
** XX:XX : Status = p<sub>VC</sub>=??*10<sup>-5</sup>mbar, T<sub>MC,RuOx</sub>=???, T<sub>MC.Si</sub>=??K
** XX:XX : Start condensing mix. '''T<sub>1</sub>=683mbar, T<sub>2</sub>=695mbar, T<sub>3</sub>=0mbar, p<sub>4</sub>=973mbar'''.
** XX:XX : Close Heat-Switch (I<sub>PCS#4</sub>=1.5A, I<sub>H</sub>=0.5mA) @ T<sub>RuOx</sub>=600mK
** XX:XX : I<sub>Still</sub>=3.0mA, T<sub>RuOx</sub>=580mK
** XX:XX : All mix is in, all pumps are running.


* XX.XX.XX: - '''RAMP MAGNET'''
**


* XX.XX.XX: - '''DEMAG '''
**




* XX.XX.XX: '''MIX OUT'''
** XX:XX : Start filling mix into the tanks.

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=TO DO=

*
*
*

{{clear}}

Latest revision as of 09:21, 5 February 2014

First RUN since more than one year!!!

NEW

  • New Switch & Relay Box for a easier and better operation of the persistent current switches of the current lines and both magnets.
  • HF coax wiring for the Paddle experiment: Two Semi rigid coax cables(Type: SC-160/50-NbTi-NbTi) connecting the experiment mounted underneath the Cu-Stage with the heat sinks at the mixing chamber (Coax #5 & #6). With the help of an "extender", made of a long silver rod, the experiment is placed in the centre of the lower magnet and can be exposed to a magnetic field up to 9T.
  • HF coax wiring for the Echo experiment leading from the heat sink at 4K (Coax #2 & #4) to a heat sink at the mixing chamber. The Echo Experiment is mounted on the top side of the Cu-Stage and connected with superconducting semi rigid coax cables (Type: SC-160/50-NbTi-NbTi) with this heat sink.


EXPERIMENTS

  • Thermometry: Noise Thermometer and Pt-NMR Thermometer
  • Paddle Experiment: Zr55Cu30Al10Ni5 (M. Hempel)
  • Echo Experiment: BK-7 (M. Wolter)


TEST


TIME TABLE

Bottles of Antikal.
Bigger than 5Āµ!.
Cheers!.
  • 28.01.2014: FIRST DAY - CLOSING
    • Closing cryostat.
    • 15:30 : Start pumping VC with VP.
    • 17:40 : Stop pumping VC, VP off: pVC~0.3mbar. Close valves, stop pump.


  • 29.01.2014 : SECOND DAY - CLEANING & LEAK TEST
    • 08:30 : pVC~3.2mbar.
    • 09:45 : Start pumping VC again for leak testing.
    • 10:30 : Cleaning cooling water circulation since it's blocked again ... :( (see photos on the right!)
    • 14:50 : Leak Test: QL<10-10mbar*l/sec (with DP running)
    • 15:00 : Cleaning/pumping lines.
    • 16:00 : Start pumping VC with DP
    • 19:00 : Stop pumping VC, DP off: 2*10-3mbar


  • 31.01.2014 : THIRD DAY - CLOSING DEWAR, MOUNTING MAGNET
    • TEST PADDLE EXPERIMENT: working! See resonance at room temperature!


  • 3.02.2014: FOURTH DAY - PRECOOLING WITH LN
    • 08:30 : Start cleaning circulation line, start pumping VC for exchange gas
    • 10:15 : Stop pumping circulation line. Start pumping both cold traps. pVC~3*10-3mbar. Cleaning 1K-pot & Dewar.
    • 10:45 : pVC~3*10-3mbar. Then fill in exchange gas to 3 mbar.
    • 11:12 : Start filling LN (60l can)
    • 16:30 : TSi~209 K, TMagn,top~189 K, TDewar~78 K, pVC=1.7 mbar
    • Continue filling LN overnight...


  • 4.02.2014: FIFTH DAY - FILLING LH
    • 08:20 : TSi~130 K, TMagn,top~131 K, TDewar~131 K, pVC=1.1 mbar. Start pumping nitrogen and clean with helium gas. Do not forget to clean 1K pot!
    • 09:40 : 1st He can --> ~68l
    • 11:45 : 2nd He can --> ~95.2l. TSi~80 K, TMagn,top~50 K, TDewar~10 K, pVC=4.5*10-1mbar.
    • 12:35 : TDewar~4 K, TSi~63 K. Switch off 1K-Pot pump and close 1K2, 1K3.
    • 13:40 : TSi~4 K. Pump VC (14:00)
    • 14:37 : 3rd He can --> ~88l.
    • 16:10 : 4th He can --> ~46l.

Total helium consumption: ~297.2l


  • 5.02.2014: SIXTH DAY - TESTING MAGNET
    • 08:00 : TSi~4.85 K, pVC=1*10-5mbar. He level ~48%
    • 08:18 : Close VC1, switch off DP.
    • 08:50 : Close VC3 & VC4, switch off FP2.


  • XX.XX.2014: THIRD DAY - MIX IN
    • XX:XX : Status = pVC=??*10-5mbar, TMC,RuOx=???, TMC.Si=??K
    • XX:XX : Start condensing mix. T1=683mbar, T2=695mbar, T3=0mbar, p4=973mbar.
    • XX:XX : Close Heat-Switch (IPCS#4=1.5A, IH=0.5mA) @ TRuOx=600mK
    • XX:XX : IStill=3.0mA, TRuOx=580mK
    • XX:XX : All mix is in, all pumps are running.


  • XX.XX.XX: - RAMP MAGNET


  • XX.XX.XX: - DEMAG



  • XX.XX.XX: MIX OUT
    • XX:XX : Start filling mix into the tanks.

TO DO

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