Heike R2010-11 R65: Difference between revisions

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= Tests =
= Tests =

*
* Persistent Current Switch between mixing chamber and demag-stage: WORKS!
*
* Noise Thermometer: WORKS!
* Pt-NMR: DOESN'T WORK! No connection to signal loop.
* New RuOx-Thermometer works well!



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= Time Table =


⚫
* 30.11.11: 1st DAY - CLOSING AND PRECOOLING
= Summary =
⚫
* 30.11.11: CLOSING AND PRECOOLING
** 10:30 : Start closing Cryo
** 10:30 : Start closing Cryo
** 14:00 : Dewar closed , start pumping dewar. All lines pumped, all pumps tested.
** 14:00 : Dewar closed , start pumping dewar. All lines pumped, all pumps tested.
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** 17:45 : LN vessel remains connected with the cryostat during the night but without any pressure, atmosphere-valve of LN can is open! (T<sub>Dewar</sub>=78K, T<sub>MC,Si-Diode</sub>=253K, p<sub>VC</sub>=3.89mbar, T<sub>Magn,u.</sub>=233)
** 17:45 : LN vessel remains connected with the cryostat during the night but without any pressure, atmosphere-valve of LN can is open! (T<sub>Dewar</sub>=78K, T<sub>MC,Si-Diode</sub>=253K, p<sub>VC</sub>=3.89mbar, T<sub>Magn,u.</sub>=233)


* 01.12.11: START COOLING WITH LHe
* 01.12.11: 2nd DAY - START COOLING WITH LHe
** 08:00 : Status: T<sub>Dewar</sub>=225K, T<sub>MC,Si-Diode</sub>=221K, p<sub>VC</sub>=3.4mbar, T<sub>Magn,u.</sub>=230K. Continue filling with LN until T<sub>Dewar</sub>=78K, continue for 5 minutes.
** 08:00 : Status: T<sub>Dewar</sub>=225K, T<sub>MC,Si-Diode</sub>=221K, p<sub>VC</sub>=3.4mbar, T<sub>Magn,u.</sub>=230K. Continue filling with LN until T<sub>Dewar</sub>=78K, continue for 5 minutes.
** 10:45 : Pump dewar (-0.8bar), float with He from recovery line
** 10:45 : Pump dewar (-0.8bar), float with He from recovery line
** 11:00 : 1st can of LHe connected, start 1K-pump (T<sub>Dewar</sub>=121K, T<sub>MC,Si-Diode</sub>=206K, p<sub>VC</sub>=3mbar, T<sub>Magn,u.</sub>=176K)
** 11:00 : 1st can of LHe connected, start 1K-pump (T<sub>Dewar</sub>=121K, T<sub>MC,Si-Diode</sub>=206K, p<sub>VC</sub>=3mbar, T<sub>Magn,u.</sub>=176K)
** 13:30 : 2nd can. By a mistake there was only 16 litres of He taken out of the 1st can!
** 16:00 : 3rd can. 95 litres were taken from 2nd can.
** 17:30 : Liquid Helium in Dewar! R<sub>Dewar</sub>=0.92{{O}}!, T<sub>MC,Si-Diode</sub>=58K, p<sub>VC</sub>=0.24mbar (=7.2K), T<sub>Magn,u.</sub>=7K
** 18:00 : 4th can. 70 litres were taken from 3rd can.
** 18:30 : 4K! T<sub>MC,Si-Diode</sub>=4.1K, p<sub>VC</sub>=4.3E-03mbar, R<sub>MC,CT</sub>=275{{O}}.
** 19:15 : Disconnect 4th can, 91 litres were taken. R<sub>MC,CT</sub>=275{{O}}, p<sub>VC</sub>=4.1E-03mbar,
-> He consumption: ~272 litres!

* 02.12.11: 3rd DAY - 4K
** 08:15 : T<sub>MC,Si-Diode</sub>=4.1K, R<sub>MC,CT</sub>=276{{O}}, p<sub>VC</sub>=4.8E-03mbar.
** 08:50 : Pump exchange gas
** 14:20 : 5th can. After 10 min. first value displayed on He-levelmeter.
** 15:20 : Stop He-transfer, levelmeter shows 100% (98 litres of He transferred)
** 15:55 : Stop pumping exchange gas, p<sub>VC</sub>=1.7E-05mbar.

* 05.12.11: 6th DAY - MIX IN
** 07:30 : Testing Noise-Thermometer
** 09:10 : Start 1K-Pump
** 09:20 : Start putting mix in, T<sub>1</sub>=690mbar, T<sub>2</sub>=700mbar, T<sub>3</sub>=240mbar
** Test Heat Switch

* 06.12.11: 7th DAY - MAGNET TEST
** Test Magnet: 13:20 Start ramping, 15:10 I<sub>Mag</sub>=15A

* 07.12.11: 8th DAY - RAMP MAGNET
** 09:40 : Heat switch closed.
** 09:55 - 10:45 : Ramp Magnet up to I<sub>Mag</sub>=40A.
** 10:57 - 14:00 : TMPs on.
** 14:39 : Close PCS of Magnet, ramp current-supply of the magnet down. -> 40Ampere persistent current inside the magnet!!!

* 21.12.11: MIX OUT!
** 17:15 : Start putting the mix in Tank 1 and Tank 2.
** 01:15 : MIX in tanks: T<sub>1</sub>=687mbar, T<sub>2</sub>=700mbar, T<sub>3</sub>=0mbar, p<sub>4</sub>=813mbar




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* done!
* done!
* details will be added :)
* details will be added :)


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= TO DO FOR NEXT RUN =

* Repair Pt-NMR Signal line.
* Kryo-Log: Improve LR-700 read-out! Add magnet current into cryo-log.


{{clear}}
{{clear}}

Latest revision as of 00:55, 22 December 2011

NEW

  • Squid-Wiring for one two-stage Squid
  • Two Lemo plugs and four coax-feedthroughs on top of cryostat.
  • RuOx-000 Thermometer on lower MC platform.
  • New Still-heater!! old one was broken? New resitance RSTILL=1.13k.
  • New Noise-Thermometer mounted on Demag-Stage read out by two Squids.


Tests

  • Persistent Current Switch between mixing chamber and demag-stage: WORKS!
  • Noise Thermometer: WORKS!
  • Pt-NMR: DOESN'T WORK! No connection to signal loop.
  • New RuOx-Thermometer works well!


Time Table

  • 30.11.11: 1st DAY - CLOSING AND PRECOOLING
    • 10:30 : Start closing Cryo
    • 14:00 : Dewar closed , start pumping dewar. All lines pumped, all pumps tested.
    • Exchange gas: pVC=10mbar.
    • 15:00 : Start filling nitrogen
    • 17:12 : Dewar Pt-100 shows LN. Continue filling.
    • 17:45 : LN vessel remains connected with the cryostat during the night but without any pressure, atmosphere-valve of LN can is open! (TDewar=78K, TMC,Si-Diode=253K, pVC=3.89mbar, TMagn,u.=233)
  • 01.12.11: 2nd DAY - START COOLING WITH LHe
    • 08:00 : Status: TDewar=225K, TMC,Si-Diode=221K, pVC=3.4mbar, TMagn,u.=230K. Continue filling with LN until TDewar=78K, continue for 5 minutes.
    • 10:45 : Pump dewar (-0.8bar), float with He from recovery line
    • 11:00 : 1st can of LHe connected, start 1K-pump (TDewar=121K, TMC,Si-Diode=206K, pVC=3mbar, TMagn,u.=176K)
    • 13:30 : 2nd can. By a mistake there was only 16 litres of He taken out of the 1st can!
    • 16:00 : 3rd can. 95 litres were taken from 2nd can.
    • 17:30 : Liquid Helium in Dewar! RDewar=0.92!, TMC,Si-Diode=58K, pVC=0.24mbar (=7.2K), TMagn,u.=7K
    • 18:00 : 4th can. 70 litres were taken from 3rd can.
    • 18:30 : 4K! TMC,Si-Diode=4.1K, pVC=4.3E-03mbar, RMC,CT=275.
    • 19:15 : Disconnect 4th can, 91 litres were taken. RMC,CT=275, pVC=4.1E-03mbar,

-> He consumption: ~272 litres!

  • 02.12.11: 3rd DAY - 4K
    • 08:15 : TMC,Si-Diode=4.1K, RMC,CT=276, pVC=4.8E-03mbar.
    • 08:50 : Pump exchange gas
    • 14:20 : 5th can. After 10 min. first value displayed on He-levelmeter.
    • 15:20 : Stop He-transfer, levelmeter shows 100% (98 litres of He transferred)
    • 15:55 : Stop pumping exchange gas, pVC=1.7E-05mbar.
  • 05.12.11: 6th DAY - MIX IN
    • 07:30 : Testing Noise-Thermometer
    • 09:10 : Start 1K-Pump
    • 09:20 : Start putting mix in, T1=690mbar, T2=700mbar, T3=240mbar
    • Test Heat Switch
  • 06.12.11: 7th DAY - MAGNET TEST
    • Test Magnet: 13:20 Start ramping, 15:10 IMag=15A
  • 07.12.11: 8th DAY - RAMP MAGNET
    • 09:40 : Heat switch closed.
    • 09:55 - 10:45 : Ramp Magnet up to IMag=40A.
    • 10:57 - 14:00 : TMPs on.
    • 14:39 : Close PCS of Magnet, ramp current-supply of the magnet down. -> 40Ampere persistent current inside the magnet!!!
  • 21.12.11: MIX OUT!
    • 17:15 : Start putting the mix in Tank 1 and Tank 2.
    • 01:15 : MIX in tanks: T1=687mbar, T2=700mbar, T3=0mbar, p4=813mbar


Checking Filterboxes

  • done!
  • details will be added :)


TO DO FOR NEXT RUN

  • Repair Pt-NMR Signal line.
  • Kryo-Log: Improve LR-700 read-out! Add magnet current into cryo-log.
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