GSI - BEA Wiki

A CCC acts as a cryogenic DC beam current transformer. It measures the intensity of lowest beam currents, circulating in storage rings, or extracted through high energy beam transport lines, respectively. The present best values, obtained with a thin-film DC SQUID at 4 K, are:

• current resolution < 250 pA/sqrt(Hz)
• bandwidth > 50 kHz
• zero drift < 4 pA/s

More information:
Papers on the CCC
Drawings
CERN - GSI

Kicked off by this magazine article the CCC project at GSI was launched, back in 1991:

Joint efforts during several years of work finally lead to an award-winning result: The 1998 Faraday Cup Award

Technical drawings of the old CCC (incomplete) and other related details: drawings

Publications highlighting basics and details of CCCs: papers

The new project was started for the upcoming FAIR facilities, and is based on the old CCC (GSI/FSU Jena - A. Peters e. a.). Collaborations with the Friedrich-Schiller-University of Jena/Dept. for Solid-State Physics, and the Max-Planck-Institute in Heidelberg will enforce research, development and construction of CCCs for FAIR and CSR.

Image of CCC installed in the beam diagnostics test bench at the extraction line of GSI Synchrotron SIS18