High brilliant and coherent X-ray sources are implemented in, for example, structure diagnostic, 4D molecular imagining and spectroscopy, and thus play important roles in the understanding of physics, chemistry, medicine and material science. Many methods have been used to generate high quality X-ray radiation, such as Free Electron Laser (FEL), synchrontron radiation. Energetic electron beams are a crucial element to produce high quality X-ray radiation. However, conventional accelerators are relative large due to the limitation of the accelerating gradient because of the material breakdown, which prevents the extent of application in our daily life. As a contrast, Laser WakeField Accelerator (LWFA) offers 1000 times higher gradient and is an ideal candidate of building a table-top electron source. We purpose to use 100TW laser system in National center university (NCU) to drive LWFA and generate polarized X-ray by betatron radiation, and free electron laser (FEL) in EUV range. Previous electron source are suffered from low quality, high energy fluctuation. Although some injection mechanism has be introduced to improve stability and quality of electron beam, the electron beam still suffers from large energy spread and large divergence angle. This research leverages and combines several advanced techniques, such as shock-front injection to achieve energy tunable electron source with low energy spread, reversed re-phasing to introduce negative chirp for electron pulse compression, and passive plasma lensing to reduce transvers emittance. We propose to use a side injection to arbitrarily tune the polarization and photon energy of betatron radiation. In the second part of this project, we use the optimized electron beam to create undulator radiation and demonstrate the FEL processing based on microbunching. FEL is highly important light source and have never been demonstrated by LWFA electron.
|Effective start/end date||1/10/20 → 30/09/21|
UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):
- free electron laser
- laser-plasma interaction
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