Observation of a THz-sub-THz spontaneous coherent undulator radiation driven by a low energy electron beam from a thermionic RF electron gun

Journal Article · Sat Feb 15 00:00:00 EST 2020 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2020.163655· OSTI ID:1780654

Smirnov, A. V. ^[1]; Agustsson, R. ^[2]; Berg, W. J. ^[3]; Dooling, J. ^[3]; Campese, T. ^[2]; Chen, Y. ^[2]; Gavryushkin, D. ^[2]; Erwin, L. ^[3]; Hartzell, J. ^[4]; Keane, R. ^[3]; O’Shea, F. H. ^[5]; Spranza, E. ^[2]; Pasky, S. ^[3]; Ruelas, M. ^[2]; Sun, Y. ^[3]; Zholents, A. A. ^[3]

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1. ViewRay Inc., Mountain View, CA (United States)
2. RadiaBeam Technologies LLC, Santa Monica, CA (United States)
3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
4. Nusano, Inc., Los Angeles, CA (United States)
5. Elettra-Sincrotrone Trieste (Italy)

In this work, we report observations of an intense, multi-band, sub-THz and THz radiation extracted from a similar to 2-3 MeV electron beam with a flat transverse profile propagating in an oversized rectangular waveguide placed into a 3.25 mm gap of a planar undulator having 1.3 cm period and similar to 20 cm length. Radiation outcoupling is accomplished using a horn antenna and a miniature permanent in-vacuum magnet separating the mm-sub-mm-waves and electron beam. A table-top experiment utilizes a radio frequency thermionic electron gun delivering a thousand momentum-chirped microbunches per macropulse and an alpha-magnet producing microbunches of a sub-mm length. Total radiated energy of a sub-millijoule per a microsecond radio frequency macropulse is demonstrated with flux more than ten micro-Joules per centimeter squared. With 1 THz filter the energy measured is about 1 microjoule and flux of a few micro-Joules per centimeter squared.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-06CH11357; SC0013684
• OSTI ID: 1780654
• Alternate ID(s): OSTI ID: 1602063
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 960; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

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