离子清除电极对DAFNE束流动力学的影响
Impact of Ion Clearing Electrodes on Beam Dynamics in DAFNE
摘要：
目前，清除电极被认为是现有和未来对撞机中电子云驱动问题的可能解决方案。由粘贴在电介质板上的薄的高电阻层制成的“隐形”电极已经被提出作为电子云清除的设计解决方案之一。这种电极首次成功地应用于LEP的正负电子蓄电池（EPA）中。类似的电极已经在DAFNE电子环中用于离子清除目的很长时间了。DAFNE的理论考虑和实验测量已经揭示了离子清除电极（ICE）对机器宽带阻抗的实质性贡献，从而引起几种有害影响，降低对撞机性能。在本文中，我们讨论了电极对DAFNE束流动力学的影响，显示的ICE尾场和阻抗计算的结果，并与现有的实验数据进行比较。我们还描述了ICE从电子环的摆动器部分，导致在显着的改善方面的束流动力学和几何光度去除的程序。
英文摘要：
Presently clearing electrodes are being considered as a possible cure of e-cloud driven problems in existing and future colliders. 'Invisible' electrodes, made of a thin highly resistive layer pasted on a dielectric plate, have been proposed as one of design solutions for the e-cloud clearing. For the first time such electrodes were successfully used in the electron-positron accumulator (EPA) of LEP. Similar electrodes had been using for a long time for ion clearing purposes in the DAFNE electron ring. Theoretical considerations and experimental measurements at DAFNE have revealed a substantial contribution of the ion clearing electrodes (ICE) to the machine broad-band impedance giving rise to several harmful effects degrading the collider performance. In this paper we discuss the impact of the electrodes on DAFNE beam dynamics, show the results of ICE wake field and impedance calculations and compare them with available experimental data. We also describe the procedure of ICE removal from the wiggler sections of the electron ring that has resulted in remarkable improvements in terms of beam dynamics and geometric luminosity.
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