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arXiv physics/0008034physics.acc-ph
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1.5 GeV S波段直线加速器的能量稳定

Energy stabilization of 1.5 GeV S-Band linac

M. Kuriki, H. Hayano, T. Naito, T. Okugi, V. Vogel

摘要:

KEK-ATF正在为未来的直线对撞机研究低发射度、多聚束电子束。1.5 GeV直线加速器的能量不稳定性一直是一个问题,使束流注入阻尼环不稳定。由于不稳定的束流也产生大量的辐射,因此KEK辐射安全政策对束流的限制远远低于我们的预期。因此,稳定S波段直线加速器不仅对提高束流质量很重要,而且对清除辐射安全限制以启动多束团操作也很重要。我们对电子枪、调制器、速调管等进行了各种改进来解决这个问题。对于调制器,我们开发了前馈控制的De-Q模块。该模块通过前馈电路控制deQ时序来补偿电压抖动,因为过度充电的量与可在deQ时序之前测量的充电斜率密切相关。能量稳定性进行了检查,并提高了3倍,从0.6%到0.2%本身。对前馈电路进行了改进,提高了系统的稳定性。新电路的测试正在进行中。对于长期的不稳定性,正在安装速调管射频锁相系统。在测试运行中,该系统性能良好,补偿相位漂移小于1 °。

英文摘要:

KEK-ATF is studying low emittance, multi-bunch electron beam for the future linear collider. The energy instability of the 1.5 GeV linac has been a problem making the beam injection to the damping ring unstable. Because the unstable beam generates also large amount of the radiation, the beam current is limited by the KEK radiation safety policy much lower than what we expect. Stabilizing the S-band linac is therefore important not only to improve the beam quality, but also to clear the radiation safety limit to start the multi-bunch operation. We have made various modifications to solve the problem on the electron gun, modulator, klystron etc. For the modulator, we have developed a feed-forward controlled De-Q module. This module compensates the voltage jitter by controlling the deQ timing with a feed-forward circuit because the amount of the excessive charge up is strongly correlated to the charge up slope that can be measured prior to the deQ timing. The energy stability was examined and was improved by a factor of 3, from 0.6% to 0.2% of itself. Modification for the feed-forward circuit to get more stability was made. The test for the new circuit is in progress. For the long term instability, phase-lock system for klystron RF is being installed. In the test operation, it showed a good performance and compensate the phase drift less than 1 deg.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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