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Title: rf breakdown tests of mm-wave metallic accelerating structures

Abstract

In this study, we explore the physics and frequency-scaling of vacuum rf breakdowns at sub-THz frequencies. We present the experimental results of rf tests performed in metallic mm-wave accelerating structures. These experiments were carried out at the facility for advanced accelerator experimental tests (FACET) at the SLAC National Accelerator Laboratory. The rf fields were excited by the FACET ultrarelativistic electron beam. We compared the performances of metal structures made with copper and stainless steel. The rf frequency of the fundamental accelerating mode, propagating in the structures at the speed of light, varies from 115 to 140 GHz. The traveling wave structures are 0.1 m long and composed of 125 coupled cavities each. We determined the peak electric field and pulse length where the structures were not damaged by rf breakdowns. We calculated the electric and magnetic field correlated with the rf breakdowns using the FACET bunch parameters. The wakefields were calculated by a frequency domain method using periodic eigensolutions. Such a method takes into account wall losses and is applicable to a large variety of geometries. The maximum achieved accelerating gradient is 0.3 GV/m with a peak surface electric field of 1.5 GV/m and a pulse length of about 2.4more » ns.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1235793
Alternate Identifier(s):
OSTI ID: 1242260; OSTI ID: 1242464
Report Number(s):
SLAC-PUB-16494
Journal ID: ISSN 2469-9888; PRABFM; 011301
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 19 Journal Issue: 1; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCPHY

Citation Formats

Dal Forno, Massimo, Dolgashev, Valery, Bowden, Gordon, Clarke, Christine, Hogan, Mark, McCormick, Doug, Novokhatski, Alexander, Spataro, Bruno, Weathersby, Stephen, and Tantawi, Sami G. rf breakdown tests of mm-wave metallic accelerating structures. United States: N. p., 2016. Web. https://doi.org/10.1103/PhysRevAccelBeams.19.011301.
Dal Forno, Massimo, Dolgashev, Valery, Bowden, Gordon, Clarke, Christine, Hogan, Mark, McCormick, Doug, Novokhatski, Alexander, Spataro, Bruno, Weathersby, Stephen, & Tantawi, Sami G. rf breakdown tests of mm-wave metallic accelerating structures. United States. https://doi.org/10.1103/PhysRevAccelBeams.19.011301
Dal Forno, Massimo, Dolgashev, Valery, Bowden, Gordon, Clarke, Christine, Hogan, Mark, McCormick, Doug, Novokhatski, Alexander, Spataro, Bruno, Weathersby, Stephen, and Tantawi, Sami G. Wed . "rf breakdown tests of mm-wave metallic accelerating structures". United States. https://doi.org/10.1103/PhysRevAccelBeams.19.011301.
@article{osti_1235793,
title = {rf breakdown tests of mm-wave metallic accelerating structures},
author = {Dal Forno, Massimo and Dolgashev, Valery and Bowden, Gordon and Clarke, Christine and Hogan, Mark and McCormick, Doug and Novokhatski, Alexander and Spataro, Bruno and Weathersby, Stephen and Tantawi, Sami G.},
abstractNote = {In this study, we explore the physics and frequency-scaling of vacuum rf breakdowns at sub-THz frequencies. We present the experimental results of rf tests performed in metallic mm-wave accelerating structures. These experiments were carried out at the facility for advanced accelerator experimental tests (FACET) at the SLAC National Accelerator Laboratory. The rf fields were excited by the FACET ultrarelativistic electron beam. We compared the performances of metal structures made with copper and stainless steel. The rf frequency of the fundamental accelerating mode, propagating in the structures at the speed of light, varies from 115 to 140 GHz. The traveling wave structures are 0.1 m long and composed of 125 coupled cavities each. We determined the peak electric field and pulse length where the structures were not damaged by rf breakdowns. We calculated the electric and magnetic field correlated with the rf breakdowns using the FACET bunch parameters. The wakefields were calculated by a frequency domain method using periodic eigensolutions. Such a method takes into account wall losses and is applicable to a large variety of geometries. The maximum achieved accelerating gradient is 0.3 GV/m with a peak surface electric field of 1.5 GV/m and a pulse length of about 2.4 ns.},
doi = {10.1103/PhysRevAccelBeams.19.011301},
journal = {Physical Review Accelerators and Beams},
number = 1,
volume = 19,
place = {United States},
year = {2016},
month = {1}
}

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Cited by: 8 works
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Works referenced in this record:

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    Works referencing / citing this record:

    Design of the Compact Linear Collider main linac accelerating structure made from two halves
    journal, April 2017


    Classification of vacuum arc breakdowns in a pulsed dc system
    journal, February 2020


    rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures
    journal, November 2016


    THz cavities and injectors for compact electron acceleration using laser-driven THz sources
    journal, April 2017


    Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave accelerating structures
    journal, September 2018


    Roadmap to the Future
    journal, January 2016