Details

Autor(en) / Beteiligte

• Nanni, Emilio A.
• Jawla, Sudheer
• Lewis, Samantha M.
• Shapiro, Michael A.
• Temkin, Richard J.

Titel

Photonic-band-gap gyrotron amplifier with picosecond pulses

Ist Teil von

• Applied physics letters, 2017-12, Vol.111 (23), p.233504-233504

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2017

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• 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.