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首页> 外文会议>International Conference on Synchrotron Radiation Instrumentation >Accelerator Physical Issues of PETRA III — A New Low Emittance Light Source
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Accelerator Physical Issues of PETRA III — A New Low Emittance Light Source

机译：Petra III的加速器身体问题 - 一种新的低辐射光源

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The reconstruction of the 2304 m long existing storage ring PETRA II into a dedicated Light Source PETRA III is presented. Envisaged is a machine with an energy of 6 GeV and an emittance of 1 nmrad operating with a current of at least 100 mA. The ring will provide 9 straight sections for the installation of undulators. For this purpose one eights of PETRA will be converted into a section of DBA cells. Two modes of operation are foreseen. One with a very high number of bunches and a second one with a considerably lower number of bunches allowing time resolved measurements. In the later mode the Touschek effect severely limits the beam lifetime to the order of an hour. To compensate for the rapid losses a frequent refilling of the machine is necessary. This procedure is usually called topping up mode. The low emittance in combination with the optics at the insertion devices leads to very small beam dimensions especially in the vertical plane. Therefore a sophisticated beam position control system is mandatory. To combat the multi bunch instabilities driven by the higher order modes of the cavities a powerful wideband feedback system is required.
机译：提出了将2304米长的现有储物环Petra II重建为专用光源Petra III。设想是一种机器，具有6个GEV的能量和1个NMRAD的射精，其电流至少为100 mA。环将提供9个直线部分，用于安装起伏器。为此目的，将八百种Petra转化为DBA细胞的一部分。预见了两种操作模式。一个具有非常大量的束和第二个具有相当较低的束数，允许时间分辨测量。在后续模式下，Touschek效果严重限制了光束寿命到一个小时的顺序。为了弥补快速损失，频繁再填充机器是必要的。此过程通常称为顶部上行模式。与插入装置处的光学器件结合的低焦平导致特别小的光束尺寸，特别是在垂直平面中。因此，强制梁位置控制系统是强制性的。为了打击由腔的高阶模式驱动的多束不稳定性，需要强大的宽带反馈系统。

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