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Title: Raising gradient limitations in 2.1 GHz superconducting photonic band gap accelerator cavities

We report results from recent 2.1 GHz superconducting radio frequency (SRF) photonic band gap (PBG) resonator experiments at Los Alamos. Two 2.1 GHz PBG cells with elliptical rods were fabricated and tested at high power in a liquid helium bath at the temperatures of 4 K and below 2 K. The described SRF PBG cells were designed with a particular emphasis on changing the shape of the PBG rods to reduce peak surface magnetic fields and at the same time to preserve its effectiveness at damping higher-order-modes. The superconducting PBG cavities have great potential for damping long-range wakefields in SRF accelerator structures without affecting the fundamental accelerating mode. The cells performed in accordance with simulation's predictions and the maximum achieved accelerating gradient was 18.3 MV/m. This represents a 30% increase over gradients previously demonstrated in superconducting PBG cavities with round rods.
Authors:
; ; ; ; ;  [1] ; ;  [2]
  1. Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545 (United States)
  2. Niowave, Inc., 1012 North Walnut Street, Lansing, Michigan 48906 (United States)
Publication Date:
OSTI Identifier:
22299907
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCELERATORS; CAVITY RESONATORS; FORECASTING; GHZ RANGE; HELIUM; MAGNETIC FIELDS; RADIOWAVE RADIATION; RESONATORS; SIMULATION; SUPERCONDUCTIVITY; SURFACES