|TUP066||New Design of SSR2 Spoke Cavity for PIP II SRF Linac||600|
Funding: US Department of Energy
Superconducting SSR2 spoke cavities provide acceleration of the H− in PIP II SRF linac from 35 to 185 MeV. The RF and mechanical design of the SSR2 cavities has been completed and satisfies the technical requirements. However, our resent results of the high RF power tests of fully dressed SSR1 cavities show considerably strong multipacting (MP), which took significant time to process. On the other hand, the new results of the tests of balloon cavity showed significant mitigation of MP. In this paper we present the results of the improved design of the SSR2 cavity, based on the balloon cavity concept. The electromagnetic design is presented, including RF parameter optimization, MP simulations, field asymmetry analysis, High Order Mode (HOM) calculations. Mechanical analysis of the dressed cavity is presented also, which includes Lorentz Force Detuning optimization, and reduction of the cavity resonance frequency sensitivity versus He pressure fluctuations. The design completely satisfies the PIP II technical requirements.
|DOI •||reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUP066|
|About •||paper received ※ 21 June 2019 paper accepted ※ 01 July 2019 issue date ※ 14 August 2019|
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