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Longitudinal phase space reconstruction for a heavy ion accelerator
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 2020-11-13 , DOI: 10.1103/physrevaccelbeams.23.114201
S. Lauber , K. Aulenbacher , W. Barth , F. Dziuba , J. List , C. Burandt , V. Gettmann , T. Kürzeder , M. Miski-Oglu , P. Forck , M. Heilmann , A. Rubin , T. Sieber , S. Yaramyshev , H. Podlech , M. Schwarz

At the GSI Helmholtzzentrum für Schwerionenforschung (GSI) in Darmstadt, Germany, a prototype cryomodule (advanced demonstrator) for the superconducting (SC) continuous wave (CW) Helmholtz Linear Accelerator (HELIAC) is under construction. A transport line, comprising quadrupole lenses, rebuncher cavities, beam correctors, and adequate beam instrumentation has been built to deliver the beam from the GSI 1.4 MeV/u High Charge Injector (HLI) to the advanced demonstrator, which offers a test environment for SC CW multigap cavities. In order to achieve proper phase space matching, the beam from the HLI must be characterized in detail. In a dedicated machine experiment the bunch shape has been measured with a nondestructive bunch shape monitor (BSM). Therefore, different bunch projections were obtained by altering the voltage of two rebunchers. These measurements were combined with dedicated beam dynamics simulations using the particle tracking code dynamion. The longitudinal bunch shape and density distribution at the beginning of the matching line are fully characterized by a tomographic reconstruction method based on a non-negative least square minimization approach.

中文翻译:

重离子加速器的纵向相空间重构

在德国达姆施塔特的GSI HelmholtzzentrumfürSchwerionenforschung(GSI),用于超导(SC)连续波(CW)亥姆霍兹线性加速器(HELIAC)的原型低温模块(高级演示器)正在建造中。一条传输线包括四极透镜,重合器腔,光束校正器和足够的光束仪器,可以将光束从GSI 1.4 MeV / u高电荷注入器(HLI)传输到高级演示器,从而为SC提供测试环境CW多间隙腔。为了实现适当的相空间匹配,必须详细描述来自HLI的光束。在专用的机器实验中,已使用非破坏性束形监视器(BSM)测量了束形。因此,通过改变两个重燃器的电压可以获得不同的束投影。动力。匹配线开始处的纵向束形状和密度分布通过基于非负最小二乘最小化方法的断层图像重建方法得以充分表征。
更新日期:2020-11-13
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