PRESENT STATUS OF THE PHOTON FACTORY RF SYSTEM
PRESENT STATUS OF THE PHOTON FACTORY RF SYSTEM
复制标题
光子工厂射频系统的现状
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
K. Umemori
中科院分区：
文献类型：
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作者：
M. Izawa;S. Sakanaka;T. Takahashi;K. Umemori
KEK的2.5 GeV光子工厂（PF）储存环的射频系统于1982年投入使用，并逐步升级。本系统包括四个500 MHz的阻尼加速腔，四个200千瓦的速调管及其电源，和一个射频分配网络。为了实现系统的高可靠性，已经做了很多努力。我们描述了该系统的现状，以及过去二十年的发展。2.5 GeV光子工厂储存环于1982年投入使用，是世界上领先的同步加速器光源之一。在最初的射频系统[1]中，四个单室腔由两个速调管驱动。该系统在1988年进行了升级，速调管的数量增加了2到4个。这种升级消除了由于射频电源对束流的潜在限制。在进行上述升级的同时，还对空腔引起的束流不稳定性进行了详尽的研究[1-5]。谐振腔中HOM的谐振频率随腔体温度的变化而变化。因此，耦合束团不稳定性与腔冷却水温度有关。1984年，公司引进了温度稳定和控制系统。这可能是第一个通过冷却水温度控制耦合束团不稳定性的实验[3]。第二，为了抑制一些有害的高阶模（HOM），
An rf system for the 2.5-GeV Photon Factory (PF) storage ring at KEK was commissioned 1982, and it has been upgraded step by step. The present system comprises four 500-MHz damped accelerating cavities, four 200-kW klystrons with their power supplies, and an rf distribution network. Much effort has been made for achieving high reliability of the system. We describe the present status of the system together with the developments for the last two decades. BRIEF HISTORY The 2.5-GeV Photon Factory storage ring was commissioned in 1982 as one of the leading synchrotron light sources in the world. In the original rf system [1], four single-cell cavities were driven by two klystrons. The system was upgraded in 1988, so that the number of klystrons increased by two to four. This upgrade removed potential limitation on the beam currents due to rf power sources. In parallel with the above upgrade, an exhaustive study on the cavity-induced beam instabilities was carried out [1-5]. The resonance frequencies of HOMs in the cavity change with the temperature of the cavity. Therefore the coupled-bunch instabilities were expected to be correlated with the cavity cooling-water temperature. Then, a temperature stabilization and control system was incorporated in 1984. This was possibly the first experiment to control the coupled-bunch instabilities by cooling-water temperature [3]. Second, in order to damp some of the harmful higher-order-modes (HOMs) of the