Speaker
Description
Beam-induced heating has become increasingly relevant for vacuum interconnect modules with the continuing rise in the LHC beam intensity, thereby heightened their sensitivity to electromagnetic resonances. While the heating itself is not the primary subject of this work, the associated failures have motivated a broader examination of how the different geometries of the vacuum interconnect modules respond to strong beam-induced electromagnetic fields. Various circular and elliptical interconnect RF-finger modules were therefore studied using the standard coaxial-stretched-wire method. The intrinsic resonances of the modules were identified as a function of the variation of module length and controlled misalignment, by means of a new instrument that enables wide geometry variations while keeping the coaxial wire under constant tension.
The measurements reveal clear differences in the resonant spectra of the various designs and show that small geometric deviations can strongly influence mode frequencies and field localisation. Understanding these behaviours is essential as the HL-LHC will operate with even higher bunch intensities, increasing the likelihood that unfavourable resonant conditions could lead to excessive local power deposition. The results contribute to improved assessment and qualification of interconnect modules for future high-luminosity operation and support the design and development of novel interconnect modules for next-generation machines.
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