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/\sqrt{Hz} in the millihertz range are obtained. 
E. Mykk\"anen, J. S. Lehtinen, A. Kemppinen, C. Krause, D. Drung, J.   Nissil\"a and A. J. Manninen
physics.ins-det