Revision 1

Accepted · first revision · record

Title: Frequency and temperature dependence of the anti-Q-slope
Plain: The loss reduction with field is strong in some cavities and absent in others, and depends on the cavity frequency and temperature. A theory must explain where it appears and where it does not.
Precise: Measurements show the anti-Q-slope is pronounced at $f \ge 1.3\,\mathrm{GHz}$ and weak or absent at lower frequency, and depends on $T$ and on the electron mean free path set by doping. Derive the boundary in $(f,T,\text{mean free path})$ separating field-decreasing from field-increasing $R_{\mathrm{BCS}}$.
Settled by: A predicted crossover map confirmed by cavities of several frequencies prepared with identical surface treatment.
Kind: phenomenon
Answer type: classification
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)