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Title: Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun

We report observations of an intense sub-THz radiation extracted from a ~3 MeV electron beam with a flat transverse profile propagating between two parallel oversized copper gratings with side openings. Low-loss radiation outcoupling is accomplished using a horn antenna and a miniature permanent magnet separating sub-THz and electron beams. A tabletop experiment utilizes a radio frequency thermionic electron gun delivering a thousand momentum-chirped microbunches per macropulse and an alpha-magnet with a movable beam scraper producing sub-mm microbunches. The radiated energy of tens of micro-Joules per radio frequency macropulse is demonstrated. The frequency of the radiation peak was generated and tuned across two frequency ranges: (476–584) GHz with 7% instantaneous spectrum bandwidth, and (311–334) GHz with 38% instantaneous bandwidth. In this study, the prototype setup features a robust compact source of variable frequency, narrow bandwidth sub-THz pulses.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [2] ;  [2]
  1. RadiaBeam Technologies, LLC, Santa Monica, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; SC0007702; SC-FOA-0007702
Type:
Published Article
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Volume: 18; Journal Issue: 9; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 43 PARTICLE ACCELERATORS
OSTI Identifier:
1222433
Alternate Identifier(s):
OSTI ID: 1223816

Smirnov, A. V., Agustsson, R., Berg, W. J., Boucher, S., Dooling, J., Campese, T., Chen, Y., Erwin, L., Jacobson, B., Hartzell, J., Lindberg, R., Murokh, A., O’Shea, F. H., Spranza, E., Pasky, S., Ruelas, M., Sereno, N. S., Sun, Y., and Zholents, A. A.. Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun. United States: N. p., Web. doi:10.1103/PhysRevSTAB.18.090703.
Smirnov, A. V., Agustsson, R., Berg, W. J., Boucher, S., Dooling, J., Campese, T., Chen, Y., Erwin, L., Jacobson, B., Hartzell, J., Lindberg, R., Murokh, A., O’Shea, F. H., Spranza, E., Pasky, S., Ruelas, M., Sereno, N. S., Sun, Y., & Zholents, A. A.. Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun. United States. doi:10.1103/PhysRevSTAB.18.090703.
Smirnov, A. V., Agustsson, R., Berg, W. J., Boucher, S., Dooling, J., Campese, T., Chen, Y., Erwin, L., Jacobson, B., Hartzell, J., Lindberg, R., Murokh, A., O’Shea, F. H., Spranza, E., Pasky, S., Ruelas, M., Sereno, N. S., Sun, Y., and Zholents, A. A.. 2015. "Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun". United States. doi:10.1103/PhysRevSTAB.18.090703.
@article{osti_1222433,
title = {Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun},
author = {Smirnov, A. V. and Agustsson, R. and Berg, W. J. and Boucher, S. and Dooling, J. and Campese, T. and Chen, Y. and Erwin, L. and Jacobson, B. and Hartzell, J. and Lindberg, R. and Murokh, A. and O’Shea, F. H. and Spranza, E. and Pasky, S. and Ruelas, M. and Sereno, N. S. and Sun, Y. and Zholents, A. A.},
abstractNote = {We report observations of an intense sub-THz radiation extracted from a ~3 MeV electron beam with a flat transverse profile propagating between two parallel oversized copper gratings with side openings. Low-loss radiation outcoupling is accomplished using a horn antenna and a miniature permanent magnet separating sub-THz and electron beams. A tabletop experiment utilizes a radio frequency thermionic electron gun delivering a thousand momentum-chirped microbunches per macropulse and an alpha-magnet with a movable beam scraper producing sub-mm microbunches. The radiated energy of tens of micro-Joules per radio frequency macropulse is demonstrated. The frequency of the radiation peak was generated and tuned across two frequency ranges: (476–584) GHz with 7% instantaneous spectrum bandwidth, and (311–334) GHz with 38% instantaneous bandwidth. In this study, the prototype setup features a robust compact source of variable frequency, narrow bandwidth sub-THz pulses.},
doi = {10.1103/PhysRevSTAB.18.090703},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 9,
volume = 18,
place = {United States},
year = {2015},
month = {9}
}