Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave accelerating structures
Abstract
Here, experiments with high gradient traveling-wave mm-wave metallic accelerating structures were performed to research the physics of vacuum rf breakdowns. The accelerating structures are open, composed of two identical halves separated by an adjustable gap. The electromagnetic fields were induced by an ultrarelativistic electron beam at the Facility for Advanced Accelerator Experimental Tests (FACET) at SLAC National Accelerator Laboratory. These accelerating structures have a fundamental beam-synchronous mode with a frequency that varies from 95 to 140 GHz depending on the gap width. When the gap is opened by more than half of a freespace wavelength, the corresponding synchronous mode remains trapped demonstrating behavior consistent with the so called “surface wave.” This regime is of potential interest for femtosecond electron beam diagnostics and beam manipulation techniques. The behavior of the surface wave was characterized and the measured synchronous frequency, pulse length and beam deflection voltage are found to be in good agreement with simulations. The wave magnitude was changed by positioning the beam at different distances from the surface of a structure-half and the corresponding rf breakdown rate was recorded. The breakdown rate was 4 × 10-3 per pulse at a peak surface electric field of 0.3 GV/m and a pulsemore »
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1470593
- Alternate Identifier(s):
- OSTI ID: 1471663
- 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: 21 Journal Issue: 9; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; beam diagnostics; electromagnetism; room temperature RF
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. Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave accelerating structures. United States: N. p., 2018.
Web. doi:10.1103/PhysRevAccelBeams.21.091301.
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. Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave accelerating structures. United States. https://doi.org/10.1103/PhysRevAccelBeams.21.091301
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. Thu .
"Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave accelerating structures". United States. https://doi.org/10.1103/PhysRevAccelBeams.21.091301.
@article{osti_1470593,
title = {Measurements of electron beam deflection and rf breakdown rate from a surface wave guided in metallic mm-wave 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 = {Here, experiments with high gradient traveling-wave mm-wave metallic accelerating structures were performed to research the physics of vacuum rf breakdowns. The accelerating structures are open, composed of two identical halves separated by an adjustable gap. The electromagnetic fields were induced by an ultrarelativistic electron beam at the Facility for Advanced Accelerator Experimental Tests (FACET) at SLAC National Accelerator Laboratory. These accelerating structures have a fundamental beam-synchronous mode with a frequency that varies from 95 to 140 GHz depending on the gap width. When the gap is opened by more than half of a freespace wavelength, the corresponding synchronous mode remains trapped demonstrating behavior consistent with the so called “surface wave.” This regime is of potential interest for femtosecond electron beam diagnostics and beam manipulation techniques. The behavior of the surface wave was characterized and the measured synchronous frequency, pulse length and beam deflection voltage are found to be in good agreement with simulations. The wave magnitude was changed by positioning the beam at different distances from the surface of a structure-half and the corresponding rf breakdown rate was recorded. The breakdown rate was 4 × 10-3 per pulse at a peak surface electric field of 0.3 GV/m and a pulse length of 60 ps.},
doi = {10.1103/PhysRevAccelBeams.21.091301},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 21,
place = {United States},
year = {Thu Sep 13 00:00:00 EDT 2018},
month = {Thu Sep 13 00:00:00 EDT 2018}
}
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https://doi.org/10.1103/PhysRevAccelBeams.21.091301
https://doi.org/10.1103/PhysRevAccelBeams.21.091301
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