Abstract
Harmonic absolute instability in the mode is found to cause mode competition in a new millimeter-wave gyrotron traveling-wave experiment designed for high stability in the mode. Complete suppression of this instability by the application of the drive has been observed with beam current up to at least 6 times the instability threshold, which results in high amplified power (∼25 kW) at high efficiency (∼23%). The study is significant in that it demonstrates that cyclotron-maser amplifiers may operate at a current well above oscillation threshold without degradation in saturated performance.
- Received 3 April 1989
DOI:https://doi.org/10.1103/PhysRevLett.63.1062
©1989 American Physical Society