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Dark current measurements on a superconducting cavity using a cryogenic current comparator
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10.1063/1.3527063
/content/aip/journal/rsi/82/1/10.1063/1.3527063
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/1/10.1063/1.3527063
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

Simplified schematic view of the meander-shaped magnetic shielding, the toroidal pick-up coil, the matching transformer, and the SQUID.

Image of FIG. 3.
FIG. 3.

Relative permeability of the ferromagnetic core material Vitrovac 6025F (Ref. 14) at 4.2 K.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

Spectral current noise distributions of the CCC at HZB without acceleration field [curve (a); black], and with acceleration field [curve (b); light gray, dotted].

Image of FIG. 7.
FIG. 7.

Comparison between the spectrum of microphonic disturbances (lower curve) measured by HZB and flux noise spectrum of the CCC (upper curve).

Image of FIG. 8.
FIG. 8.

Dark current of approximately 21 nA measured with the CCC (black curve, filtered and smoothed) and Faraday Cup (gray, triangles).

Image of FIG. 9.
FIG. 9.

Dark current of approximately 5 nA measured with the CCC (black curve, filtered and smoothed) and Faraday Cup (gray, triangles).

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/content/aip/journal/rsi/82/1/10.1063/1.3527063
2011-01-18
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dark current measurements on a superconducting cavity using a cryogenic current comparator
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/1/10.1063/1.3527063
10.1063/1.3527063
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