1. On the Mystery of using Helium's second Sound for Quench Detection of a Superconducting Cavity
- Author
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Stephen Markham and Ralf Eichhorn
- Subjects
Physics ,Superconductivity ,business.industry ,Detector ,chemistry.chemical_element ,Triangulation (social science) ,Physics and Astronomy(all) ,second sound ,superconducting RF ,Nuclear magnetic resonance ,Optics ,chemistry ,Superconducting cavity ,Excited state ,Second sound ,business ,Helium ,quench detection - Abstract
The detection of a second sound wave, excited by a quench, has become a valuable tool in diagnosing hot spots and performance limitations of superconducting cavities. Several years ago, Cornell developed a convenient detector (OSTs) for these waves that nowadays are used world-wide. In a usual set-up, many OSTs surround the cavity and the quench location is determined by triangulation of the different OST signals. Convenient as the method is there is a small remaining mystery: taking the well-known velocity of the second sound wave, the quench seems to come from a place slightly beyond the cavity's outer surface. We will present a model that might help explaining the discrepancy.
- Published
- 2015
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