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Description
For the 500 MHz cavities in the main storage ring of SLS 2.0, we plan to manufacture additional spares of the higher order mode (HOM) loads. We saw the current design using ferrite tiles as too risky for us to produce, so we did a redesign using silicon carbide (SiC) blocks, used already with good results for HOM damping in the SLS 2.0 stripline kickers. For good performance specially near cutoff, a prolonged load geometry allows the SiC blocks to taper in smoothly. Up to 1200 watts HOM power can be accepted by the load. SiC being quite tolerant to heat up, we rely on black body radiation for cooling resulting in a more homogeneous heat load distribution of the containing waveguide. The load is cooled by water circuits integrated into the waveguide ridges. Two dedicated pumping ports and an optical view port complete the technical design. Even taking into account possible large variations in the RF properties of SiC, we expect a quite satisfactory performance with a RF match better than 10 dB near the waveguide cutoff and even better than 20 dB for frequencies above 1 GHz. A prototype is currently under production and will undergo lab tests under nominal conditions this summer.
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