Revision as of 05:53, 31 January 2011

RUN NOVEMBER 2010

First Run with Cu-Stage!

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.

Persistent Current Switch:
- Test PCS of Pt-NMR: Works! (1.5Amp)
- Test Heat-Switch of Cu-Stage: Doesn't! :( Seems like the superconducting wire has a small ohmic resistance of a few m ${\Omega }$ . This leads to small heating of some mW and causes the shunting via the 4K-flange!

@@ Line 10: / Line 10: @@
 ** 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.
-* Test Heat-Switch of Cu-Stage: Doesn't! :( 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!
+* Persistent Current Switch:
+** Test PCS of Pt-NMR: Works! (1.5Amp)
+** Test Heat-Switch of Cu-Stage: Doesn't! :( 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!