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Title: Five-cell superconducting RF module with a PBG coupler cell: design and cold testing of the copper prototype

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.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Niowave, Lansing, MI (United States)
Publication Date:
OSTI Identifier:
1179051
Report Number(s):
LA-UR--15-23227
TRN: US1600143
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: International Particle Accelerator Conference (IPAC 2015), Richmond, VA (United States), 3-8 May 2015
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE/LANL
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ELECTRON BEAMS; LINEAR ACCELERATORS; COPPER; DESIGN; EXPERIMENTAL DATA; DAMPING; OSCILLATION MODES; QUALITY FACTOR; MILLI AMP BEAM CURRENTS; TESTING; COUPLING; INSTABILITY; TUNING; SUPERCONDUCTING CAVITY RESONATORS; SIMULATION Accelerator Design, Technology, and Operations