Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

High gradient off-axis coupled C-band Cu and CuAg accelerating structures

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0132706· OSTI ID:1960029
 [1];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [3]
  1. SLAC National Accelerator Laboratory, Menlo Park, CA (United States); SLAC
  2. SLAC National Accelerator Laboratory, Menlo Park, CA (United States)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Here, we report the high gradient testing results of two single-cell off-axis coupled standing wave accelerating structures. Two brazed standing wave off-axis coupled structures with the same geometry were tested: one made of pure copper (Cu) and one made of a copper–silver (CuAg) alloy with a silver concentration of 0.08%. A peak surface electric field of 450 MV/m was achieved in the CuAg structure for a klystron input power of 14.5 MW and a 1 μs pulse length, which was 25% higher than the peak surface electric field achieved in the Cu structure. The superb high gradient performance was achieved because of the two major optimizations in the cavity's geometry: (1) the shunt impedance of the cavity was maximized for a peak surface electric field to accelerating gradient ratio of ~2 for a fully relativistic particle, and (2) the peak magnetic field enhancement due to the input coupler was minimized to limit pulse heating. These tests allow us to conclude that C-band accelerating structures can operate at peak fields similar to those at higher frequencies while providing a larger beam iris for improved beam transport.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1960029
Alternate ID(s):
OSTI ID: 1905910
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 25 Vol. 121; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (17)

Principles RF Linear Accelerators book May 1998
Design, fabrication and first beam tests of the C-band RF acceleration unit at SINAP
  • Fang, Wencheng; Gu, Qiang; Sheng, Xing
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 823 https://doi.org/10.1016/j.nima.2016.03.101
journal July 2016
Advances in high gradient normal conducting accelerator structures
  • Simakov, Evgenya I.; Dolgashev, Valery A.; Tantawi, Sami G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 907 https://doi.org/10.1016/j.nima.2018.02.085
journal November 2018
Sharp shooters journal April 2014
First lasing and operation of an ångstrom-wavelength free-electron laser journal August 2010
Geometric dependence of radio-frequency breakdown in normal conducting accelerating structures journal October 2010
Experimental demonstration of externally driven millimeter-wave particle accelerator structure journal August 2020
A proton beam energy modulator for rapid proton therapy journal February 2021
Ab initio Cu alloy design for high-gradient accelerating structures journal March 2022
High-gradient breakdown studies of an X -band Compact Linear Collider prototype structure journal May 2017
High gradient experiments with X -band cryogenic copper accelerating cavities journal October 2018
Realization and high power test of damped C -band accelerating structures journal April 2020
High-gradient testing of an S -band, normal-conducting low phase velocity accelerating structure journal August 2020
Design and demonstration of a distributed-coupling linear accelerator structure journal September 2020
New local field quantity describing the high gradient limit of accelerating structures journal October 2009
Experimental study of rf pulsed heating journal April 2011
Modern and future colliders journal March 2021

Similar Records

High-Gradient Tests of the Single-Cell SC Cavity with a Feedback Waveguide
Journal Article · Thu Nov 04 00:00:00 EDT 2010 · AIP Conference Proceedings · OSTI ID:21428791

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS