Schematic view of the HoBiCaT test facility with the TESLA cavity, CCC, and Faraday Cup. The dashed line is added to indicate the CCC with its components.
Simplified schematic view of the meander-shaped magnetic shielding, the toroidal pick-up coil, the matching transformer, and the SQUID.
Relative permeability of the ferromagnetic core material Vitrovac 6025F (Ref. 14) at 4.2 K.
Simplified scheme of the CCC with the high performance dc SQUID system of Jena University. On the left-hand side, the superconducting components at 1.8 K are shown. On the right-hand side, one can see the components of the SQUID electronics at 300 K.
Dark current from the raw CCC-SQUID-signal (gray), calculated with an overall current sensitivity of 243 nA/V. The black curve is the signal filtered by means of a 5 Hz low pass filter.
Spectral current noise distributions of the CCC at HZB without acceleration field [curve (a); black], and with acceleration field [curve (b); light gray, dotted].
Comparison between the spectrum of microphonic disturbances (lower curve) measured by HZB and flux noise spectrum of the CCC (upper curve).
Dark current of approximately 21 nA measured with the CCC (black curve, filtered and smoothed) and Faraday Cup (gray, triangles).
Dark current of approximately 5 nA measured with the CCC (black curve, filtered and smoothed) and Faraday Cup (gray, triangles).
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