To provide an operationally stabilized multi-cavity klystron by constituting at least a part of a diametrically taperingly changing part of a drift tube of the multi-cavity klystron having plural resonant cavities and the drift tube, out of a surface material having a high frequency loss larger than the other surface material of the drift tube.
A resonant cavity 13c and a resonant cavity 13d are connected to each other by a drift tube 17 where a taper part is arranged in a part. Tube empty unit parts P and Q to form a diametrically small part and a diametrically large part of the drift tube 17, are formed of, for example, copper. On the other hand, for example, a partial surface part R to form a taper part of the drift tube 17 is formed of an electromagnetic wave absorber such as silicon carbide(SiC) or metal having a high frequency loss larger than copper such as stainless steel. Therefore, a Q valve of the resonant cavities formed over a collector part from the taper part of the drift tube is reduced, and operation of a multi-cavity klystron can be stabilized.
OKUBO YOSHIHISA
YONEZAWA HIROSHI
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