CERN数字LLRF家族的成就和新挑战
Achievements and New Challenges for CERN's Digital LLRF Family
摘要：
一个创新的数字低电平RF（LLRF）系列已经在CERN开发，并部署在几个圆形机器上。欧洲核子研究中心的PS助推器（PSB）、低能离子环（LEIR）和超低能反质子（ELENA）环的运行都从这个新系列的灵活性和处理能力中获益匪浅。实现了束流和腔反馈回路，以及束团成形、纵向爆破和束团分裂。对于ELENA，还部署了纵向诊断，例如聚束强度和聚束长度测量。在长周期2（LS2）期间，反质子减速器（AD）和四环PSB的铁氧体基高水平RF（HLRF）系统将被Finemet基HLRF取代。这将需要为AD提供新的LLRF系统，并对现有的PSB LLRF系统进行深度升级。本文概述了数字LLRF系列迄今为止取得的主要成果，以及LLRF团队在LS2期间将面临的挑战。
英文摘要：
An innovative digital Low-Level RF (LLRF) family has been developed at CERN and deployed on several circular machines. Operation of CERN's PS Booster (PSB), Low Energy Ion Ring (LEIR) and Extra Low ENergy Antiproton (ELENA) ring all reaped great benefit from the flexibility and processing power of this new family. Beam and cavity feedback loops have been implemented, as well as bunch shaping, longitudinal blowup and bunch splitting. For ELENA, longitudinal diagnostics such as bunched beam intensity and bunch length measurements have also been deployed. During Long Shutdown 2 (LS2) the ferrite-based High-Level RF (HLRF) systems of the Antiproton Decelerator (AD) and of the four-ring PSB will be replaced with Finemet-based HLRF. This will require a new LLRF system for the AD and deep upgrades to the existing PSB LLRF systems. This paper gives an overview of the main results achieved by the digital LLRF family so far and of the challenges the LLRF team will take on during LS2.
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