Absolute instability competition and suppression in a millimeter-wave gyrotron traveling-wave tube
Journal
Physical Review Letters
Journal Volume
63
Journal Issue
10
Pages
1062-1065
Date Issued
1989
Author(s)
Abstract
Harmonic absolute instability in the TE21 mode is found to cause mode competition in a new millimeter-wave gyrotron traveling-wave experiment designed for high stability in the TE11 mode. Complete suppression of this instability by the application of the TE11 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. © 1989 The American Physical Society.
SDGs
Type
journal article