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Title: Photonic-band-gap gyrotron amplifier with picosecond pulses

Here, we report the amplification of 250 GHz pulses as short as 260 ps without observation of pulse broadening using a photonic-band-gap circuit gyrotron traveling-wave-amplifier. The gyrotron amplifier operates with a device gain of 38 dB and an instantaneous bandwidth of 8 GHz. The operational bandwidth of the amplifier can be tuned over 16 GHz by adjusting the operating voltage of the electron beam and the magnetic field. The amplifier uses a 30 cm long photonic-band-gap interaction circuit to confine the desired TE 03-like operating mode while suppressing lower order modes which can result in undesired oscillations. The circuit gain is >55 dB for a beam voltage of 23 kV and a current of 700 mA. These results demonstrate the wide bandwidths and a high gain achievable with gyrotron amplifiers. The amplification of picosecond pulses of variable lengths, 260–800 ps, shows good agreement with the theory using the coupled dispersion relation and the gain-spectrum of the amplifier as measured with quasi-CW input pulses.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [2] ; ORCiD logo [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Stanford Univ., Menlo Park, CA (United States). SLAC National Accelerator Lab.
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of California, Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; EB001965; EB004866
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 23; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1417663

Nanni, Emilio A., Jawla, Sudheer, Lewis, Samantha M., Shapiro, Michael A., and Temkin, Richard J.. Photonic-band-gap gyrotron amplifier with picosecond pulses. United States: N. p., Web. doi:10.1063/1.5006348.
Nanni, Emilio A., Jawla, Sudheer, Lewis, Samantha M., Shapiro, Michael A., & Temkin, Richard J.. Photonic-band-gap gyrotron amplifier with picosecond pulses. United States. doi:10.1063/1.5006348.
Nanni, Emilio A., Jawla, Sudheer, Lewis, Samantha M., Shapiro, Michael A., and Temkin, Richard J.. 2017. "Photonic-band-gap gyrotron amplifier with picosecond pulses". United States. doi:10.1063/1.5006348.
@article{osti_1417663,
title = {Photonic-band-gap gyrotron amplifier with picosecond pulses},
author = {Nanni, Emilio A. and Jawla, Sudheer and Lewis, Samantha M. and Shapiro, Michael A. and Temkin, Richard J.},
abstractNote = {Here, we report the amplification of 250 GHz pulses as short as 260 ps without observation of pulse broadening using a photonic-band-gap circuit gyrotron traveling-wave-amplifier. The gyrotron amplifier operates with a device gain of 38 dB and an instantaneous bandwidth of 8 GHz. The operational bandwidth of the amplifier can be tuned over 16 GHz by adjusting the operating voltage of the electron beam and the magnetic field. The amplifier uses a 30 cm long photonic-band-gap interaction circuit to confine the desired TE03-like operating mode while suppressing lower order modes which can result in undesired oscillations. The circuit gain is >55 dB for a beam voltage of 23 kV and a current of 700 mA. These results demonstrate the wide bandwidths and a high gain achievable with gyrotron amplifiers. The amplification of picosecond pulses of variable lengths, 260–800 ps, shows good agreement with the theory using the coupled dispersion relation and the gain-spectrum of the amplifier as measured with quasi-CW input pulses.},
doi = {10.1063/1.5006348},
journal = {Applied Physics Letters},
number = 23,
volume = 111,
place = {United States},
year = {2017},
month = {12}
}