High Power Laser Science and Engineering, Vol. 8, Issue 2, 02000e18 (2020)
Improved stability of a compact vacuum-free laser-plasma X-ray source
L. Martín1, J. Benlliure1,†, D. Cortina-Gil1, J. Peñas1, and C. Ruiz2
- 1IGFAE, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- 2Instituto Universitario de Física Fundamental y Matemáticas y Dpto. de Didáctica de la Matemática y de las Ciencias Experimentales, Universidad de Salamanca, Patio de Escuelas s/n, Salamanca, Spain
We report the development of a stable high-average power X-ray source generated by the interaction of ultrashort laser pulses (35 fs, 1 mJ, 1 kHz) with a solid target in air. The achieved source stability, which is essential for the applications foreseen for these laser-driven plasma accelerators, is due to the combination of precise positioning of the target on focus and the development of a fast rotating target system able to ensure the refreshment of the material at every shot while minimizing positioning errors with respect to the focal spot. This vacuum-free laser-plasma X-ray source provides an average dose rate of 1.5 Sv/h at 30 cm and a repeatability better than 93% during more than 36 min of continuous operation per target.
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