Higher Order Modes Damping and Multipacting Analysis for the SPX Deflecting Cavity in APS Upgrade

Conference · Sun Dec 01 04:00:00 EST 2013

OSTI ID:1992490

Li, Z. ^[1]; Xiao, L. ^[1]; Ng, C. ^[1]; Nassiri, A. ^[2]; Waldschmidt, G. ^[2]; Wu, G. ^[2]; Wang, H. ^[3]; Rimmer, R. ^[3]

---

1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
2. Argonne National Laboratory (ANL), Argonne, IL (United States)
3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

A single-cell superconducting deflecting cavity operating at 2.815 GHz has been proposed and designed for the Short Pulse X-ray (SPX) project for the Advanced Photon Source (APS) upgrade. Each deflecting cavity is equipped with one fundamental power coupler (FPC), one lower order mode (LOM) coupler, and two higher order mode (HOM) couplers to achieve the stringent damping requirements for the unwanted modes. Using the electromagnetic simulation suite ACE3P, HOM damping will be calculated for the cavity including the full engineering design waveguide configurations and rf windows. Trapped modes in the bellows located in the beampipes connecting the cavities in a cryomodule will be computed and their effects on heating evaluated. Furthermore, multipacting activities at the end groups of the cavity will be identified to assess possible problems during high power processing.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1992490
• Report Number(s): JLAB-ACC-13-1820; DOE/OR/23177-2946
• Country of Publication: United States
• Language: English