Reducing current noise in cryogenic experiments by vacuum-insulated cables.
We measure the current noise of several cryogenic cables in a pulse tube based dilution refrigerator at frequencies between about 1 mHz and 50 kHz. We show that vibration-induced noise can be efficiently suppressed by using vacuum-insulated cables between room temperature and the 2nd pulse tube stage. A noise peak below 4 fA at the 1.4 Hz operation frequency of the pulse tube and a white noise density of 0.44 fA/Hz in the millihertz range are obtained.
VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, P.O. Box 1000, Espoo, 02044 VTT, Finland.
E
E
Mykkänen
VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, P.O. Box 1000, Espoo, 02044 VTT, Finland.
J S
JS
Lehtinen
VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, P.O. Box 1000, Espoo, 02044 VTT, Finland.
A
A
Kemppinen
Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany.
C
C
Krause
Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany.
D
D
Drung
VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, P.O. Box 1000, Espoo, 02044 VTT, Finland.
J
J
Nissilä
VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, P.O. Box 1000, Espoo, 02044 VTT, Finland.
A J
AJ
Manninen