Commissioning of L-band intense electron linac for industrial applications

S. Kim, H.R. Yang, M. Cho, W. Namkung, S. Jang, S.J. Kwon, Y. Son, S. Park, J. Oh
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Abstract

An intense L-band electron linear accelerator is under construction at CESC (Cheorwon Electron-beam Service Center) for industrial applications. It is capable of producing 10-MeV electron beams with 30-kW average beam power. For high-power capability, we adopted 1.3 GHz, and the RF source is a 25-MW pulsed klystron with 60-kW average RF output power. The PFN-type modulator and the matched transformer provide 264-kV beam voltage with 230-A beam current to the klystron. The RF pulse length is 7 mus, and the repetition rate is 350 Hz. The thermionic E-gun generates 80-kV electron beams with pulsed 1.6 A. The pre-buncher, a single standing-wave cavity, is used before the bunching section, which is built-in with the regular accelerating section. The accelerating structure is a disk-loaded waveguide with a constant-impedance operated in the 2pi/3-mode. It is to be operated under the fully beam-loaded condition, where the beam power is maximum. The electron beams are accelerated within 6 mus since the traveling-wave filling time of the accelerating structure is almost 0.8 mus. In this paper, we present details of the accelerator system and commissioning results.
工业用l波段强电子直线加速器的调试
铁原电子束服务中心(CESC)正在建设用于工业应用的强l波段电子直线加速器。它能够以30千瓦的平均束流功率产生10兆电子伏的电子束。对于大功率能力,我们采用1.3 GHz,射频源为25mw脉冲速调管,平均射频输出功率为60kw。pfn型调制器和匹配的变压器为速调管提供264 kv的波束电压和230 a的波束电流。射频脉冲长度为7 μ m,重复频率为350hz。热离子电子枪产生80kv的脉冲1.6 A电子束。在聚束段之前使用预聚束器,一个单驻波腔,它与常规加速段内置在一起。加速结构是一个圆盘加载波导,具有恒定阻抗,工作在2pi/3模式下。它是在全梁载条件下运行的,此时梁功率最大。由于加速结构的行波填充时间几乎为0.8 μ m,电子束在6 μ m内被加速。在本文中,我们介绍了加速器系统的细节和调试结果。
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