Speaker
Gang Xiong
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.2028.pdf
Multi-keV X-ray source generation at the Shenguang-III prototype
Gang Xiong, Yunsong Dong, Yang Zhao, Bo Qing, Zhimin Hu, Minxi Wei, Tianming Song,
Min Lv, Zhiyu Zhang, Guohong Yang, Jiyan Zhang, Jiamin Yang, Shaoen Jiang
Research Center of Laser Fusion, China Academy of Engineering Physics, P. O. Box 919-986,
Mianyang 621900, China
Efficient multi-keV sources are essential in inertial confinement fusion and high energy
density physics for radiography, opacity measurements, material testing, and so on[1-5]. In this
talk, we present the recent progress in multi-keV sources developments at the Shenguang-III
prototype laser facility. An underdense plasma mechanism was used to improve the
laser-to-X-ray conversion efficiency. Main targets are small cylindrical cavities with 700-800
μm diameter, and 500-800 μm height. The main wall materials are Ti, V and Ni enclosed by
CH tubes of 30 μm thick. Eight 3ω laser beams with total energy of about 6.4 kJ in a 1 ns
square pulse were focused on the inner wall of the cavity. The absolute X-ray fluxes were
measured by absolutely calibrated HXRDs and FXRDs for X-ray energy higher and lower
than 4keV, respectively. HXRDs and FXRDs were installed at different angles for X-ray
angular distribution measurements. K-shell X-ray spectra were recorded by crystal
spectrometers. The electron temperatures were deduced from both the laser Thomson scatters
and X-ray spectra. The time behaviors of the X-ray images in two energy ranges were
recorded through an X-ray framing camera. The X-ray conversion efficiency was about 2-3
times higher than the traditional thick solid.
Reference:
[1] S. Tu et al., Phys. Plasmas 23, 013102 (2016).
[2] Y. Dong et al., J. Appl. Phys. 115, 43305 (2014).
[3] W. Shang et al., Appl. Phys. Lett. 102, 94105 (2013).
[4] K. B. Fournier et al., Phys. Rev. Lett. 92, 165005 (2004).
[5] C. A. Back et al., Phys. Rev. Lett. 87, 275003 (2001).
