High-power test results for a cylindrical-shell silicon carbide higher-order-mode damper

Journal Article · 17 March 2024 · Physical Review Accelerators and Beams

DOI: https://doi.org/10.1103/PhysRevAccelBeams.27.031601 · OSTI ID:2325499

Xu, Wencan ; Conway, Z. A.; Daly, E.; Guo, J.; Hernandez, K.; Holmes, D. ; Rimmer, R. A.; Severino, F. ; Smith, K.; Weiss, D. ; Zaltsman, A.

The next high-current Electron-Ion Collider (EIC) is a new accelerator to be built at Brookhaven National Laboratory in collaboration with Thomas Jefferson National Accelerator Facility. In the EIC Electron Storage Ring (ESR), there will be beam currents of up to 2.5 A, which will excite massive higher-order-mode (HOM) power in the 17 single-cell 591 MHz superconducting radio-frequency (SRF) cavities. Damping the HOM power in the ESR SRF cavities is a challenge. A room temperature cylindrical shell shape silicon carbide (SiC) beamline HOM absorber (BLA) was chosen as the baseline design, due to its broadband and high-power capability, and previous demonstrations at other accelerator facilities, albeit at much lower power. Because the EIC BLA HOM power dissipation is significantly greater than the previous applications, it is imperative to carry out high-power testing to determine the maximum device performance levels achievable for thermal transport, rf breakdown, and mechanical stress, prior to finalizing the design. A SiC HOM absorber with a state-of-the-art geometry size was prototyped to verify the shrink-fit technique, test outgassing rate, and high-power handling capability. This paper presents the HOM damper’s prototyping and test results. Published by the American Physical Society 2024

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program
• Grant/Contract Number: AC02-98CH10886; AC05-06OR23177
• OSTI ID: 2325499
• Report Number(s): DOE/OR/23177-7429; JLAB-ACC-24-4006; 031601
• Journal Information: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Journal Issue: 3 Vol. 27; ISSN 2469-9888; ISSN PRABCJ
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English