Frequency Doubling Harmonic GyroTWTs development and experimental studies

1
Frequency Doubling Harmonic Gyro-TWTs(developmen
t and experimental studies)
Institute for Plasma Research MURI 99

• We will complete the optimization of operating
  parameters and measurements of output power,
  gain, bandwidth, efficiency, phase noise and
  stability of the Ka-band TE03 frequency doubling
  gyro-TWT by Dec. 1999.
• The device is predicted to produce output power
  at 35 Ghz of more than 200 kW with 30 dB gain, a
  bandwidth of nearly 1, efficiency at least 20,
  mean phase deviation less than 2 degrees and be
  zero drive stable.

2
Frequency Doubling Harmonic Gyro-TWTs(developmen
t and experimental studies)
Institute for Plasma Research MURI 99

• A new frequency multiplying, harmonic gyro-TWT is
  currently under development. Simulations of the
  TE0n fundamental input and harmonic output
  circuits show that more than 5 bandwidth may be
  achievable.
• Cold testing of the structures and plans to
  fabricate the tube are underway.

Input Mode Launcher and
Converter Extended Interaction Output
Circuit
3
Novel Fast-wave Amplifier Concepts (Theory)
Institute for Plasma Research MURI 99

• Nonlinear theory of two-stage gyro-TWTs
  operating
• at the fundamental cyclotron resonance,
• in the frequency doubling regime.
• Theory of a gyro-TWT with a waveguide partially
  loaded with a lossy dielectric for realizing
  stable, high gain operation.