Heike R2010-11 R64: Difference between revisions
From KIP Wiki
ā§¼kip-jumptonavigationā§½ā§¼kip-jumptosearchā§½
(Created page with '= RUN NOVEMBER 2010 = First Run with Cu-Stage!') Ā |
Ā |
||
| (8 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
= RUN NOVEMBER 2010 = |
= RUN 64: NOVEMBER 2010 = |
||
First Run with Cu-Stage! |
First Run with Cu-Stage! |
||
{{clear}} |
|||
== Summary == |
|||
* 11.29.10 : Cryo closed |
|||
* 11.30.10 : Start filling LN (13:30) |
|||
* 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. |
|||
* 12.01.10 : After 400l of LHe (11:40) dewar is filled and T<sub>Si</sub>=4.2K. |
|||
* 12.17.10 : MIX OUT |
|||
* 03.03.11 : Open Dewar and Cryo |
|||
{{clear}} |
|||
== 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 T<sub>C</sub>'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{{O}}. 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. |
|||
* ... |
|||
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.
- ...
