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Design of the Cathode Stalk for the LCLS-II-HE Low Emittance Injector

Konomi, T.; Hartung, W.; Kim, S.-H.; Miller, S.; Morris, D.; Popielarski, J.; Saito, K.; Taylor, A.; Xu, T.; Adolphsen, C.; Lewellen, J.; Gatzmaga, S.; Murcek, P.; Xiang, R.; Kelly, M.; Petersen, T.

Superconducting radio-frequency (SRF) electron guns are attractive for delivery of beams at a high bunch repetition rate with a high accelerating field. An SRF gun is the most suitable injector for the high-energy upgrade of the Linac Coherent Light Source (LCLS-II-HE), which will produce high-energy Xrays at high repetition rate. An SRF gun is being developed for LCLS-II-HE as a collaborative effort by FRIB, HZDR, ANL, and SLAC. The cavity operating frequency is 185.7 MHz, and the target accelerating field at the photocathode is 30 MV/m. The photocathode is replaceable. The cathode is held by a fixture ('cathode stalk') that is designed for thermal isolation and particle-free cathode exchange. The stalk must allow for precise alignment of the cathode position, cryogenic or room-temperature cathode operating temperature, and DC bias to inhibit multipacting. We are planning a test of the stalk to confirm that the design meets the requirements for RF power dissipation and biasing. In this presentation, we will describe the cathode stalk design and RF/DC stalk test plan.

  • Open Access Logo Poster
    North American Particle Accelerator Conference 2022 (NAPAC'22), 07.-12.08.2022, Albuquerque, New Mexico, USA
    DOI: 10.18429/JACoW-NAPAC2022-MOPA87
    ISSN: 2226-0366
  • Open Access Logo Contribution to proceedings
    North American Particle Accelerator Conference 2022 (NAPAC'22), 07.-12.08.2022, Albuquerque, New Mexico, USA
    Proceedings of North American Particle Accelerator Conference 2022: JACoW, 978-3-95450-232-5
    DOI: 10.18429/JACoW-NAPAC2022-MOPA87
    ISSN: 2226-0366

Permalink: https://www.hzdr.de/publications/Publ-35563
Publ.-Id: 35563