Studies of Proton Driven Plasma Wakefield Acceleration by Yangmei Li

Author:Yangmei Li
Language: eng
Format: epub
ISBN: 9783030501167
Publisher: Springer International Publishing

3.4.4 Parameter Dependence and Reduction of the Energy Spread

The simulated case is typical for a wide range of parameter space of the hollow plasma. For example, Fig. 3.10 shows that variations of the channel radius from 320 m to 380 m or the plasma density from 4 cm to 6 cm do not result in substantial changes of the energy gain and energy spread. Furthermore, theoretically as long as the acceleration regime is free from plasma electrons and ions, the normalized emittance of the witness beam can be preserved at a low level, and the majority of electrons can survive with proper focusing from the external quadrupoles regardless of the plasma channel parameters. This is confirmed by Fig. 3.11.

Fig. 3.10Dependence of the energy gain and energy spread on the channel radius (a) and the plasma density (b). The dash-dotted frames denote the baseline case. The acceleration length is individually optimized for each data set

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