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Title: Measurement of Dielectric Multipactor Thresholds at 110 GHz

Abstract

We report experimental measurements of the threshold for multipactor discharges on dielectric surfaces at 110 GHz. Multipactor was studied in two geometries: electric field polarized parallel to or perpendicular to the sample surface. Measured multipactor thresholds ranged from 15 to 34 MV /m, more than 10 times higher than those found at conventional microwave frequencies. Measured thresholds were compared with prior data at lower frequencies, showing agreement with theoretical predictions that thresholds increase linearly with frequency. Measurements of the rf power dissipated in the multipactor show low dissipation (≤ 1%) for the parallel electric field case, but very strong dissipation for the perpendicular case, also in agreement with theoretical predictions. In conclusion, the agreement between experiment and theory over a wide range of frequencies provides a strong basis for the understanding of dielectric multipactor discharges.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1595407
Grant/Contract Number:  
SC0015566; FC02-93ER54186
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Multipactor; High-frequency & RF discharges in plasmas; Plasma discharges in vacuum; Plasma Physics

Citation Formats

Schaub, S. C., Shapiro, M. A., and Temkin, R. J. Measurement of Dielectric Multipactor Thresholds at 110 GHz. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.175001.
Schaub, S. C., Shapiro, M. A., & Temkin, R. J. Measurement of Dielectric Multipactor Thresholds at 110 GHz. United States. doi:10.1103/PhysRevLett.123.175001.
Schaub, S. C., Shapiro, M. A., and Temkin, R. J. Fri . "Measurement of Dielectric Multipactor Thresholds at 110 GHz". United States. doi:10.1103/PhysRevLett.123.175001.
@article{osti_1595407,
title = {Measurement of Dielectric Multipactor Thresholds at 110 GHz},
author = {Schaub, S. C. and Shapiro, M. A. and Temkin, R. J.},
abstractNote = {We report experimental measurements of the threshold for multipactor discharges on dielectric surfaces at 110 GHz. Multipactor was studied in two geometries: electric field polarized parallel to or perpendicular to the sample surface. Measured multipactor thresholds ranged from 15 to 34 MV /m, more than 10 times higher than those found at conventional microwave frequencies. Measured thresholds were compared with prior data at lower frequencies, showing agreement with theoretical predictions that thresholds increase linearly with frequency. Measurements of the rf power dissipated in the multipactor show low dissipation (≤ 1%) for the parallel electric field case, but very strong dissipation for the perpendicular case, also in agreement with theoretical predictions. In conclusion, the agreement between experiment and theory over a wide range of frequencies provides a strong basis for the understanding of dielectric multipactor discharges.},
doi = {10.1103/PhysRevLett.123.175001},
journal = {Physical Review Letters},
number = 17,
volume = 123,
place = {United States},
year = {2019},
month = {10}
}

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