Improving the RF stabilities of BEPCII by a disturbance observer based controller

作     者：Qunyao Wang Jianping Dai Haiyin Lin Zhenghui Mi Yi Sun Ziwei Deng 

作者机构：Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China 

出 版 物：《Radiation Detection Technology and Methods》 (辐射探测技术与方法（英文）)

年 卷 期：2021年第5卷第2期

页      面：220-227页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

主　　题：RF stability Digital low-level RF(DLLRF) Disturbance-observer-based(DOB)controller 

摘      要：Background A digital low level radio frequency(DLLRF)system has been developed to replace the old analog LLRF and operated stably at BEPCII east RF station in the past two *** RF stabilities required for BEPCII are±1%in magnitude and±1 degree in *** are satisfied both by the new DLLRF and the old analog ***,the DLLRF did not improve the RF stabilities so much as expected,especially when the beam current was high in collision *** The purpose is to improve the RF stabilities further and meet the requirements by the upgraded BEPCII project(BEPC3).Method A disturbance observer based(DOB)controller to suppress the noise was developed and tested with beam at BEPCII RF *** The DOB controller works and the RF stabilities with beam may be improved from±1%to less than±0.5%in magnitude and from±1 degree to less than±0.5 degrees in phase.