학술논문
Ultimate current resolution of a cryogenic current comparator
Document Type
Periodical
Author
Source
IEEE Transactions on Instrumentation and Measurement IEEE Trans. Instrum. Meas. Instrumentation and Measurement, IEEE Transactions on. 48(6):1306-1313 Dec, 1999
Subject
Language
ISSN
0018-9456
1557-9662
1557-9662
Abstract
The sensitivity and current resolution of an overlapping tube cryogenic current comparator (CCC) are calculated in terms of an equivalent electrical circuit model. The key features for optimum design are given, and theoretical predictions are compared with experiments. We propose that optimum current resolution will be achieved when the overlapping tube is used as single turn sensing coil directly connected to a SQUID, which must have its input coil inductance matched to that of the overlapping tube. The possibility of including a strip wound ferromagnetic core is also analyzed. It is shown that a "fractional turn loop" sensing coil may enhance the CCC sensitivity above that of the SQUID.