介绍了L波段长脉冲相对论速调管放大器(RKA)的强流相对论电子束(IREB)的调制及微波提取等方面的实验研究.重点分析了束流经过中间腔间隙调制后束流脉冲缩短和输出微波脉冲缩短问题,经过对注入微波、中间腔和输出腔等参数的调节,得到了比较强的基波调制电流和微波辐射.采用446kV/3.0kA/1.4μs的空心电子束,经过四腔放大后,得到381MW/200ns的辐射微波,束波转换效率28%,增益34dB.

This paper presents the progress on an Lband long pulse relativistic klystron amplifier. Modulation of IREB through the idler cavity gap and microwave extraction from the modulated IREB are described in detail. The problem of beamcurrentpulseshortening through the idler cavity gap is solved to a certain extent as well as the problem of output microwave pulseshortening, and highmodulated IREB are obtained after parameter adjustment on the input microwave and the idler cavity. In the experiment, the 446kV/ 30kA/1.4μs hollow electron beams generated about 2.0kA/1.0μs modulated current after two idler cavity gaps. They got more than 381MW/200ns RF power with the new output cavity loaded Q of about 7.9. The efficiency is 28%, and the gain is 34dB.