Polarization control of laser-driven x-ray

Shao-wei Chou; Chun-Cheng Chu; Wei-Cheng Liu; Shih-Hung Chen; Ming-Wei Lin; Hsu-hsin Chu

doi:10.1117/12.2587624

19 April 2021 Polarization control of laser-driven x-ray

Shao-wei Chou, Chun-Cheng Chu, Wei-Cheng Liu, Shih-Hung Chen, Ming-Wei Lin, Hsu-hsin Chu

Proceedings Volume 11778, Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources IV; 1177804 (2021) https://doi.org/10.1117/12.2587624
Event: SPIE Optics + Optoelectronics, 2021, Online Only

Abstract

We propose a table-top linearly polarized hard X-ray source by using a tilted shock-front injection in a laser wakefield accelerator (LWFA) to achieve comprehensive control of both polarization and energy of X-ray. By using shock-front injection, the electron bunches are injected during a sharp transition of plasma density. The length of density transition is significantly shorter than the plasma wavelength and offers a highly localized injection. In regular injection methods, such as self and ionization injection, the majority of electrons are injected radially symmetrically. Particle-in-cell (PIC) simulations show the tilted shock front breaks radial symmetry of injection and creates coherent in-plane oscillation of electrons. The coherence of electron bunches is maximized around 30 degrees which leads to a linearly polarized betatron radiation. The polarization of the resulting X-ray is analyzed by Bragg diffraction after collimation by a polycapillary lens.

Conference Presentation

Citation Download Citation

Shao-wei Chou, Chun-Cheng Chu, Wei-Cheng Liu, Shih-Hung Chen, Ming-Wei Lin, and Hsu-hsin Chu "Polarization control of laser-driven x-ray", Proc. SPIE 11778, Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources IV, 1177804 (19 April 2021); https://doi.org/10.1117/12.2587624

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