Speaker
Description
PERLE, under construction at IJCLab, is a multi-turn Energy Recovery Linac designed for high intensity electron beams of 10 MW peak power (20 mA, 250 MeV). Simulations of its SRF cryomodule * predict more than 100 W of higher-order-mode (HOM) power per cavity induced by the short bunches, indicating that Beam Line Absorbers (BLAs) at 40 K may be required between cavities to dissipate the HOM power and protect the 2 K stage. However, the lack of complete properties of dielectric materials for candidate absorbers limits accurate BLA design. To address this, we are conducting dedicated studies of BLA materials at IJCLab. We measured the broadband dielectric properties of Kyocera SC1000 samples from BNL ** at room temperature using a setup at CLIC (CERN) and cross-validated the results with independent measurements from JLab***. In parallel, we designed and simulated two cryogenic coaxial test stands, one operating up to 18 GHz and another extending coverage to 40 GHz. These warm measurements provide baseline data for upcoming cryogenic studies and validated input for the design of BLAs in next-generation accelerators such as the EIC at BNL, FCC-ee at CERN, and in particular PERLE at IJCLab.
Footnotes
*/ C. Barbagallo, “Design and optimization of higher order mode couplers for the superconducting cavities of the PERLE energy recovery linac”, PhD thesis, Université Paris-Saclay, 2024
** W. Xu, et al., Phys. Rev. Accel. Beams 27 031601 (2024)
*** J. Guo “HOM damping for the EIC ESR SRF Cryomodule”, International Workshop on Higher Order Modes in Superconducting Cavities
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