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| Home > Publications database > Precision control of plasma wakefields for highly efficient and energy-spread-preserving electron acceleration |
| Home > Publications database > Precision control of plasma wakefields for highly efficient and energy-spread-preserving electron acceleration |
| Conference Presentation (Invited) | PUBDB-2021-03640 |
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2021
Abstract: Plasma-wakefield accelerators driven by intense particle beams promise to significantly reduce the size of future high-energy facilities. These applications require an energy-efficient acceleration process with a well-controlled energy spectrum, both of which can be achieved simultaneously by tailoring the plasma wakefield. Prerequisite for such control of the wakefield is its precise measurement. Here we discuss a new measurement technique that enables femtosecond-level sampling of the longitudinal electric fields and that is particularly powerful due to its operational simplicity. Using this method, we experimentally demonstrated optimal beamloading in a nonlinear electron-driven plasma accelerator by wakefield flattening at the few-percent level. Bunches were accelerated at a gradient of 1.3 GV/m and with an energy-transfer efficiency of (42±4)% while preserving per-mille energy spreads with full charge coupling. These results open the door to high-quality operation of future plasma accelerators through precise control of the acceleration process.
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