Abstract
This paper explores a hybrid mode rf structure that served as a superconducting radio-frequency coupler. This application achieves a reflection ${\mathrm{S}}_{(1,1)}$ varying from 0 to $\ensuremath{-}30\text{ }\text{ }\mathrm{db}$ and delivers cw power at 7 KW. The coupler has good thermal isolation between the 2 and 300 K sections due to vacuum separation. Only one single hybrid mode can propagate through each section, and no higher order mode is coupled. The analytical and numerical analysis for this coupler is given and the design is optimized. The coupling mechanism to the cavity is also discussed.
Highlights
Superconducting radio-frequency (SRF) technology is widely implemented in various accelerator projects around the world [1]
Hybrid modes were first found by Snitzer in 1961; they are more universal modes than the transverse electric (TE) and transverse magnetic (TM) modes [7]
An SRF resonator usually operates in the L band; for example, a TESLA shape cavity operates at 1.3 GHz
Summary
Superconducting radio-frequency (SRF) technology is widely implemented in various accelerator projects around the world [1]. We present a new hybrid input coupler structure to reduce the static heat loss. We introduce a new input coupler design. This design avoids physical contact between the outer conductor from the input waveguide and the cavity receiver. The CEBAF waveguide coupler has a static cryogenic losses around 19 W when input power is 8 kW [6]. This new coupler produces a negligible static thermal loss
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