SLOTTED THIRD - HARMONIC GYRO - TWT AMPLIFIER

Objectives

• Develop high-performance compact, low voltage, low magnetic field 95 GHz amplifier in collaboration with Varian Associates with
  • 10 kW average power,
  • 20% efficiency,
  • 30 dB gain
  • 3% bandwidth
• Test scaled device at 10 GHz

• Gyro-TWT yields high power with wide bandwidth
• Slotted circuit increases interaction strength for low-voltage electron beam
• Harmonic interaction reduces required low magnetic field
• Use gyroresonant rf-accelerator to produce requisite axis-encircling electron beam for scaled tests

• Designed slotted third-harmonic gyro-TWT meeting the specifications
• Small-signal tests yielded
  • One section device:
    • 3 % bandwidth
    • 12 dB gain
  • Two section device:
    • 5 % bandwidth
    • 25 dB gain