TY - CONF AU - Konomi, T. AU - Adolphsen, C. AU - Gatzmaga, S. AU - Hartung, W. AU - Kelly, M.P. AU - Kim, S.H. AU - Lewellen, J.W. AU - Miller, S.J. AU - Morris, D.G. AU - Murcek, P. AU - Petersen, T.B. AU - Popielarski, J.T. AU - Saito, K. AU - Taylor, A. AU - Xiang, R. AU - Xu, T. ED - Biedron, Sandra ED - Simakov, Evgenya ED - Milton, Stephen ED - Anisimov, Petr M. ED - Schaa, Volker R.W. TI - Design of the Cathode Stalk for the LCLS-II-HE Low Emittance Injector J2 - Proc. of NAPAC2022, Albuquerque, NM, USA, 07-12 August 2022 CY - Albuquerque, NM, USA T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - 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 X-rays 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 253 EP - 255 KW - cathode KW - cavity KW - gun KW - SRF KW - ISOL DA - 2022/10 PY - 2022 SN - 2673-7000 SN - 978-3-95450-232-5 DO - doi:10.18429/JACoW-NAPAC2022-MOPA87 UR - https://jacow.org/napac2022/papers/mopa87.pdf ER - TY - CONF AU - Lewellen, J.W. AU - Adolphsen, C. AU - Arnold, A. AU - Choi, Y. AU - Compton, C. AU - Coy, R. AU - Du, X.-J. AU - Gatzmaga, S. AU - Ge, L. AU - Greene, D.B. AU - Hartung, W. AU - Ji, F. AU - Kelly, M.P. AU - Kim, S.H. AU - Konomi, T. AU - Miller, S.J. AU - Morris, D.G. AU - Murcek, P. AU - Murphy, M.J. AU - Patil, M.S. AU - Petersen, T.B. AU - Popielarski, J.T. AU - Popielarski, L. AU - Saito, K. AU - Xiang, R. AU - Xiao, L. AU - Xu, T. ED - Biedron, Sandra ED - Simakov, Evgenya ED - Milton, Stephen ED - Anisimov, Petr M. ED - Schaa, Volker R.W. TI - Status of the SLAC/MSU SRF Gun Development Project J2 - Proc. of NAPAC2022, Albuquerque, NM, USA, 07-12 August 2022 CY - Albuquerque, NM, USA T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - The LCLS-II-HE project at SLAC is intended to increase the photon energy reach of the LCLS-II FEL to at least 20 keV. In addition to upgrading the undulator system, and increasing the electron beam energy to 8 GeV, the project will also construct a low-emittance injector (LEI) in a new tunnel. To achieve the LEI emittance goals, a low-MTE photocathode will be required, as will on-cathode electric fields up to 50% higher than those achievable in the current LCLS-II photoinjector. The beam source for the LEI will be based around a superconducting quarterwave cavity resonant at 185.7 MHz. A prototype gun is currently being designed and fabricated at the Facility for Rare Isotope Beams (FRIB) at Michigan State University. This paper presents the performance goals for the new gun design, an overview of the prototype development effort, current status, and future plans including fabrication of a "production" gun for the LEI. PB - JACoW Publishing CP - Geneva, Switzerland SP - 623 EP - 626 KW - cathode KW - gun KW - cavity KW - SRF KW - cryomodule DA - 2022/10 PY - 2022 SN - 2673-7000 SN - 978-3-95450-232-5 DO - doi:10.18429/JACoW-NAPAC2022-WEPA03 UR - https://jacow.org/napac2022/papers/wepa03.pdf ER -