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TUPH04 |
Simulations of High Transformer Ratio High Brightness Plasma Wakefield Acceleration for Accelerator Parameters of SXFEL Facility at SINAP | |
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High transformer ratio (HTR) Plasma Wakefield Accelerator (PWFA) based on shaped electron bunches is an important topic of plasma wakefield acceleration for future light sources and colliders [1]. To explore the possibility of implementing PWFA at SXFEL, we performed 3D PIC simulations using shaped electron beam parameters obtained by start-to-end beam line simulations [2]. The PIC simulations show that an average transformer ratio around 4 can be maintained for about 10 cm long low density plasma, and the energy gain of the trailing bunch eventually reaches 5.9 GeV. In addition, plasma density downramp injection has also been tested as a possible high brightness injection method for HTR acceleration, and preliminary results will be presented. Simulations and analysis are also performed to check the effects of transverse beam size on HTR high brightness acceleration.
[1] W. Lu, W. An, C. Huang et al., "High Transformer ratio PWFA for Applications on XFELs", Bulletin of the American Physical Society, 2009, 54. [2] Z. Wang, Z. T. Zhao et al., private communication. |
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TUPH07 |
Damping of Hosing Instability for Plasma-wakefield Acceleration in Uniform Plasma | |
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| Current models predict the hosing instability to crucially limit the applicability of plasma-wakefield accelerators, especially for long driver cases. However, present analytical model is only suitable when beam size and hosing amplitude is much less than plasma blow-out radius. By developing a physically simple model which incorporates the single particle betatron motion and particle loss due to large betatron amplitude, this work demonstrates that the asymmetric particle loss due to the phase mismatch between beam hose and plasma respondency can damp hosing amplitude in magnitudes with negligible beam loss. We find excellent agreement between our model and 3D particle-in-cell simulations. Besides, for wide driver, we achieve stable propagation when transformer ration is about 5, which is almost impossible based on the previous understanding. | ||
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