18–26 Sept 2025
Ito International Research Center
Asia/Tokyo timezone

Status of the CW SRF gun development at FRIB for LCLS-II-HE

THB04
25 Sept 2025, 12:00
20m
Ito International Research Center

Ito International Research Center

Tokyo
Board: THB04
Invited Oral Presentation MC4: SRF Technologies Thursday Oral Session: B

Speaker

John Smedley (SLAC National Accelerator Laboratory)

Description

A superconducting radio-frequency photo-injector (SRF-PI) can in principle operate in continuous-wave (CW) mode at high gradients with ultra-high vacuum. Using low mean-transverse-energy photocathodes, SRF-PIs could provide high-brightness, high- repetition-rate beams with long cathode lifetimes. For these reasons, an SRF-PI has been adopted for the proposed Low Emittance Injector addition to the SLAC Linac Coherent Light Source II High-Energy (LCLS-II-HE) Upgrade, which would operate in CW with bunch rates of up to 1 MHz. This new injector is a critical part of the effort to extend the photon energy range of this new x-ray laser. A 185.7 MHz quarter-wave gun cavity and cryomodule have been developed by the Facility for Rare Isotope Beam at Michigan State University (FRIB/MSU) in collaboration with HZDR, ANL, and SLAC. A cryomodule test of the first prototype gun cavity and cold tests of a second cavity are underway at FRIB/MSU. The cavities have met the goal of 30 MV/m photocathode field in cold tests in which a photocathode was not installed. All critical cavity parameters fit very well with the simulations and a fully integrated module test with normal conducting cathodes (both metal and semiconductor) are underway.

Funding Agency

Work supported in part by the U.S. Department of Energy under contract number DEAC02-76SF00515 through FWP100903.

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Author

John Smedley (SLAC National Accelerator Laboratory)

Co-authors

James Maniscalco (SLAC National Accelerator Laboratory) Chris Adolphsen (SLAC National Accelerator Laboratory) Fuhao Ji (SLAC National Accelerator Laboratory) Ting Xu (Facility for Rare Isotope Beams) Yoonhyuck Choi (Facility for Rare Isotope Beams) Kyle Elliott (Facility for Rare Isotope Beams) Blake Gower (Facility for Rare Isotope Beams) Bryan Tousignant (Facility for Rare Isotope Beams) John Wenstrom (Facility for Rare Isotope Beams) Alex Taylor (Facility for Rare Isotope Beams) Chris Compton (Facility for Rare Isotope Beams) Wei Chang (Facility for Rare Isotope Beams) Xiaoji Du (Facility for Rare Isotope Beams) Walter Hartung (Facility for Rare Isotope Beams) Sang-Hoon Kim (Facility for Rare Isotope Beams) Taro Konomi (Facility for Rare Isotope Beams) Samuel Miller (Facility for Rare Isotope Beams) Dan Morris (Facility for Rare Isotope Beams) Mohit Patil (Facility for Rare Isotope Beams) Laura Popielarski (Facility for Rare Isotope Beams) Jie Wei (Facility for Rare Isotope Beams) Ziye Yin (Facility for Rare Isotope Beams) Michael Kelly (Argonne National Laboratory) Troy Petersen (Argonne National Laboratory) Andre Arnold (Helmholtz-Zentrum Dresden-Rossendorf) Stefan Gatzmaga (Helmholtz-Zentrum Dresden-Rossendorf) Reinhard Steinbrück (Helmholtz-Zentrum Dresden-Rossendorf) Petr Murcek (Helmholtz-Zentrum Dresden-Rossendorf) Rong Xiang (Helmholtz-Zentrum Dresden-Rossendorf) Jochen Teichert (Helmholtz-Zentrum Dresden-Rossendorf) Dr John Lewellen (Los Alamos National Laboratory) Mr Benjamin Sims (Los Alamos National Laboratory)

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