Heike R2010-11 R64: Difference between revisions
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= RUN NOVEMBER 2010 = |
= RUN 64: NOVEMBER 2010 = |
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First Run with Cu-Stage! |
First Run with Cu-Stage! |
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{{clear}} |
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== Summary == |
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* 11.29.10 : Cryo closed |
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* 11.30.10 : Start filling LN (13:30) |
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* 12.01.10 : Start filling LHe (12:40), Start conditions: T<sub>Si</sub>=166K, T<sub>Mag,TOP</sub>=155K, T<sub>Dewar</sub>=110K. |
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* 12.01.10 : After 400l of LHe (11:40) dewar is filled and T<sub>Si</sub>=4.2K. |
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* 12.17.10 : MIX OUT |
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* 03.03.11 : Open Dewar and Cryo |
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** Test ET- Susceptibility Thermometer: Works! :) |
** Test ET- Susceptibility Thermometer: Works! :) |
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** Test Pt-NMR: Works so far. Frozen in a persistent current of 1.5A, but we weren't able to read out the NMR quit well since we didn't know whether the Cu-stage was cold or not. |
** Test Pt-NMR: Works so far. Frozen in a persistent current of 1.5A, but we weren't able to read out the NMR quit well since we didn't know whether the Cu-stage was cold or not. |
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** FPD: Read-out doesn't work with the digital Lock-In amplifier ITHACO 3961B due to its too high noise on the analog signal output. Therefore we changed to a analog Lock-In amplifier (ITHACO 393). With this device we are now able to detect all five T<sub>C</sub>. |
** FPD: Read-out doesn't work with the digital Lock-In amplifier ITHACO 3961B due to its too high noise on the analog signal output. Therefore we changed to a analog Lock-In amplifier (ITHACO 393). With this device we are now able to detect all five T<sub>C</sub>'s. |
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* Persistent Current Switch: |
* Persistent Current Switch: |
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** Test PCS of Pt-NMR: Works! (1.5Amp) |
** Test PCS of Pt-NMR: Works! (1.5Amp) |
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** Test Heat-Switch of Cu-Stage: Doesn't work! :( Seems like the superconducting wire has a small ohmic resistance of a few m{{O}}. This leads to small heating of some mW and causes the shunting via the 4K-flange! |
** Test Heat-Switch of Cu-Stage: Doesn't work! :( Seems like the superconducting wire has a small ohmic resistance of a few m{{O}}. This leads to small heating of some mW and causes the shunting via the 4K-flange! |
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== TO DO == |
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* Get rid of ground loops. |
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* Fixing the superconducting PCS of the thermal link connecting the Cu-stage. |
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* Suppress magnetic noise |
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* Remove filters in NMR-line. |
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* ... |
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Latest revision as of 10:41, 3 March 2011
RUN 64: NOVEMBER 2010
First Run with Cu-Stage!
Summary
- 11.29.10 : Cryo closed
- 11.30.10 : Start filling LN (13:30)
- 12.01.10 : Start filling LHe (12:40), Start conditions: TSi=166K, TMag,TOP=155K, TDewar=110K.
- 12.01.10 : After 400l of LHe (11:40) dewar is filled and TSi=4.2K.
- 12.17.10 : MIX OUT
- 03.03.11 : Open Dewar and Cryo
Tests
We did a lot of test with our new build in devices and connected heat-switches.
- Thermometry:
- Test Si-Diode (Model: DT-470-CU): Works great down to approximately 1.1K There is only a small deviation of 0.1K at 4.2K. So we should do some small corrections of the calibration curve.
- Test PdFe- Susceptibility Thermometer: Doesn't work!
- Test ET- Susceptibility Thermometer: Works! :)
- Test Pt-NMR: Works so far. Frozen in a persistent current of 1.5A, but we weren't able to read out the NMR quit well since we didn't know whether the Cu-stage was cold or not.
- FPD: Read-out doesn't work with the digital Lock-In amplifier ITHACO 3961B due to its too high noise on the analog signal output. Therefore we changed to a analog Lock-In amplifier (ITHACO 393). With this device we are now able to detect all five TC's.
- Persistent Current Switch:
- Test PCS of Pt-NMR: Works! (1.5Amp)
- Test Heat-Switch of Cu-Stage: Doesn't work! :( Seems like the superconducting wire has a small ohmic resistance of a few m. This leads to small heating of some mW and causes the shunting via the 4K-flange!
TO DO
- Get rid of ground loops.
- Fixing the superconducting PCS of the thermal link connecting the Cu-stage.
- Suppress magnetic noise
- Remove filters in NMR-line.
- ...
