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Title: rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures

Abstract

This study explores the physics of vacuum rf breakdowns in subterahertz high-gradient traveling-wave accelerating structures. We present the experimental results of rf tests of 200 GHz metallic accelerating structures, made of copper and copper-silver. 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. The traveling-wave structure is an open geometry, 10 cm long, composed of two halves separated by a gap. The rf frequency of the fundamental accelerating mode depends on the gap size and can be changed from 160 to 235 GHz. When the beam travels off axis, a deflecting field is induced in addition to the longitudinal field. We measure the deflecting forces by observing the displacement of the electron bunch and use this measurement to verify the expected accelerating gradient. Furthermore, we present the first quantitative measurement of rf breakdown rates in 200 GHz metallic accelerating structures. The breakdown rate of the copper structure is 10–2 per pulse, with a peak surface electric field of 500 MV/m and a rf pulse length of 0.3 ns, which at a relatively large gap of 1.5 mm, ormore » one wavelength, corresponds to an accelerating gradient of 56 MV/m. For the same breakdown rate, the copper-silver structure has a peak electric field of 320 MV/m at a pulse length of 0.5 ns. For a gap of 1.1 mm, or 0.74 wavelengths, this corresponds to an accelerating gradient of 50 MV/m.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1333976
Alternate Identifier(s):
OSTI ID: 1335075
Report Number(s):
SLAC-PUB-16884
Journal ID: ISSN 2469-9888; PRABFM; 111301
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: 11; 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, O’Shea, Brendan, Spataro, Bruno, Weathersby, Stephen, and Tantawi, Sami G. rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures. United States: N. p., 2016. Web. doi:10.1103/PhysRevAccelBeams.19.111301.
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Dal Forno, Massimo, Dolgashev, Valery, Bowden, Gordon, Clarke, Christine, Hogan, Mark, McCormick, Doug, Novokhatski, Alexander, O’Shea, Brendan, Spataro, Bruno, Weathersby, Stephen, & Tantawi, Sami G. rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures. United States. https://doi.org/10.1103/PhysRevAccelBeams.19.111301
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Dal Forno, Massimo, Dolgashev, Valery, Bowden, Gordon, Clarke, Christine, Hogan, Mark, McCormick, Doug, Novokhatski, Alexander, O’Shea, Brendan, Spataro, Bruno, Weathersby, Stephen, and Tantawi, Sami G. Wed . "rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver accelerating structures". United States. https://doi.org/10.1103/PhysRevAccelBeams.19.111301.
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@article{osti_1333976,
title = {rf breakdown measurements in electron beam driven 200 GHz copper and copper-silver 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 O’Shea, Brendan and Spataro, Bruno and Weathersby, Stephen and Tantawi, Sami G.},
abstractNote = {This study explores the physics of vacuum rf breakdowns in subterahertz high-gradient traveling-wave accelerating structures. We present the experimental results of rf tests of 200 GHz metallic accelerating structures, made of copper and copper-silver. 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. The traveling-wave structure is an open geometry, 10 cm long, composed of two halves separated by a gap. The rf frequency of the fundamental accelerating mode depends on the gap size and can be changed from 160 to 235 GHz. When the beam travels off axis, a deflecting field is induced in addition to the longitudinal field. We measure the deflecting forces by observing the displacement of the electron bunch and use this measurement to verify the expected accelerating gradient. Furthermore, we present the first quantitative measurement of rf breakdown rates in 200 GHz metallic accelerating structures. The breakdown rate of the copper structure is 10–2 per pulse, with a peak surface electric field of 500 MV/m and a rf pulse length of 0.3 ns, which at a relatively large gap of 1.5 mm, or one wavelength, corresponds to an accelerating gradient of 56 MV/m. For the same breakdown rate, the copper-silver structure has a peak electric field of 320 MV/m at a pulse length of 0.5 ns. For a gap of 1.1 mm, or 0.74 wavelengths, this corresponds to an accelerating gradient of 50 MV/m.},
doi = {10.1103/PhysRevAccelBeams.19.111301},
journal = {Physical Review Accelerators and Beams},
number = 11,
volume = 19,
place = {United States},
year = {Wed Nov 30 00:00:00 EST 2016},
month = {Wed Nov 30 00:00:00 EST 2016}
}
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https://doi.org/10.1103/PhysRevAccelBeams.19.111301
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    Works referencing / citing this record:

    Design of Planar Millimeter-Wave Metallic Structures for Wakefield Acceleration
    journal, October 2018

    • Zhang, Liang; He, Wenlong; Jamison, Steven
    • Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 40, Issue 1
    • DOI: 10.1007/s10762-018-0545-8

    Demonstration of sub-luminal propagation of single-cycle terahertz pulses for particle acceleration
    journal, September 2017

    Design of the Compact Linear Collider main linac accelerating structure made from two halves
    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

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