Five-cell superconducting RF module with a PBG coupler cell: design and cold testing of the copper prototype
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Niowave, Lansing, MI (United States)
We report the design and experimental data for a copper prototype of a superconducting radio-frequency (SRF) accelerator module. The five-cell module has an incorporated photonic band gap (PBG) cell with couplers. The purpose of the PBG cell is to achieve better higher order mode (HOM) damping, which is vital for preserving the quality of high-current electron beams. Better HOM damping raises the current threshold for beam instabilities in novel SRF accelerators. The PBG design also increases the real-estate gradient of the linac because both HOM damping and the fundamental power coupling can be done through the PBG cell instead of on the beam pipe via complicated end assemblies. First, we will discuss the design and accelerating properties of the structure. The five-cell module was optimized to provide good HOM damping while maintaining the same accelerating properties as conventional elliptical-cell modules. We will then discuss the process of tuning the structure to obtain the desired accelerating gradient profile. Finally, we will list measured quality factors for the accelerating mode and the most dangerous HOMs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE/LANL
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1179051
- Report Number(s):
- LA-UR-15-23227; TRN: US1600143
- Resource Relation:
- Conference: International Particle Accelerator Conference (IPAC 2015), Richmond, VA (United States), 3-8 May 2015
- Country of Publication:
- United States
- Language:
- English
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