期刊
出版社
ELSEVIER
DOI: 10.1016/j.nima.2010.03.076
关键词
Superconducting cavity; Temperature-mapping; Thermal quenching; Field emission; Multipacting
A new cavity diagnostic system is introduced for a performance test of superconducting cavity at KEK-STF. It is composed of about 300 carbon resistors and several tens of PIN photo diodes. Heating on cavity surface at a thermal quenching is detected by the carbon resistor, which is called Temperature-mapping, and X-ray at field emission by PIN photo diode. This system detected successfully the heating location for every performance test, which is carried out totally seven times, and the causes of the field limit were clearly specified. The most apparent phenomenon is the thermal quenching by defect or contamination on the cavity surface and the next is the field emission. It is not clear whether the multipacting actually limits the cavity field or not. (C) 2010 Elsevier B.V. All rights reserved.
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