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SRF2003 Show Abstract

Title Q Disease: Insights from 350 MHz Spoke Cavities Tests and ERD Analyses of Hydrogen Profile in Nb
Type Poster materials / surface effects
Abstract While degassing hydrogen at an elevated temperature (>600 C) can reduce the chance of Q degradation (Q disease), eliminating this process would significantly reduce the production cost and time of cavities.   Past published data elsewhere have shown significant Q disease at relatively low frequencies such as the 130 MHz quarter-wave resonator at JAERI despite general observation of insignificant effect on low-frequency cavities.  We have tested our 350 MHz spoke cavities and found that these cavities do not show any Q disease after up to 24 hours of holding at 100 K, but show the disease with longer holding time, although the extent of the degradation was different between the two cavities.  Elastic Recoil Detection Analyses (ERDA) data on the hydrogen content and the depth profile in niobium used for the fabrication of our spoke cavities will also be shown with various surface treatments.  Finally, insights from these studies into what is the best way to treat cavity to avoid high-temperature degassing will be drawn.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Tajima T. LANL
Edwards R. L. LANL
Krawczyk F. L. LANL
Schrage D. L. LANL
Shapiro A. H. LANL

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