Digital base-band rf control system for the superconducting Darmstadt electron linear accelerator
Digital base-band rf control system for the superconducting Darmstadt electron linear accelerator
复制标题
超导达姆施塔特电子直线加速器数字基带射频控制系统
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
N. Pietralla
中科院分区：
文献类型：
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作者：
M. Konrad;U. Bonnes;C. Burandt;R. Eichhorn;P. Nonn;J. Enders;N. Pietralla
达姆施塔特工业大学，D-64289达姆施塔特，德国（2012年1月31日接收；2012年5月17日发表）超导腔中的加速场必须通过射频（rf）控制系统来稳定振幅和相位。超导腔由于其高负载的质量因数，极易受到微音的影响。为了满足对准确性、可用性和诊断的更高要求，超导达姆施塔特电子直线加速器S-DALINAC的先前模拟射频控制系统已被数字射频控制系统所取代。新硬件由两个部分组成：一个射频模块，将信号从腔转换到基带，一个现场可编程门阵列板，包括一个软CPU，执行控制算法的信号处理步骤。对于正常导体和超导腔采用不同的算法。为了提高控制系统的可用性，已经实施了自动固件和软件部署技术。广泛的诊断功能为操作员提供了额外的信息。射频控制系统的架构及其组件的功能将与表征系统性能的测量一起呈现，例如，产生低至ð A=AÞ的振幅不稳定
Institut fu¨r Kernphysik, Technische Universita¨t Darmstadt, D-64289 Darmstadt, Germany(Received 31 January 2012; published 17 May 2012)The accelerating field in superconducting cavities has to be stabilized in amplitude and phase by aradio-frequency (rf) control system. Because of their high loaded quality factor superconducting cavitiesare very susceptible for microphonics. To meet the increased requirements with respect to accuracy,availability, and diagnostics, the previous analog rf control system of the superconducting Darmstadtelectron linear accelerator S-DALINAC has been replaced by a digital rf control system. The newhardware consists of two components: An rf module that converts the signal from the cavity down to thebase-band and a field-programmable gate array board including a soft CPU that carries out the signalprocessing steps of the control algorithm. Different algorithms are used for normal-conducting andsuperconducting cavities. To improve the availability of the control system, techniques for automaticfirmware and software deployment have been implemented. Extensive diagnostic features provide theoperator with additional information. The architecture of the rf control system as well as the functionalityof its components will be presented along with measurements that characterize the performance of thesystem,yielding, e.g.,anamplitudestabilization down to ð A=AÞ