Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser
Liu, Jiaqi and Li, Wentao and Liu, Jiansheng and Qin, Zhiyong and Wang, Wentao and Qi, Rong and Zhang, Zhijun and Yu, Changhai and Fang, Ming and Feng, Ke and Wu, Ying and Wang, Cheng and Li, Ruxin (2018) Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser. AIP Advances, 8 (10). 105204. ISSN 2158-3226 (https://doi.org/10.1063/1.5022817)
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Abstract
Measurement of the matched spot size in the hydrogen-filled capillary discharge waveguide based on the spot size oscillation of a collimated laser is presented in this paper. The spot size oscillation trace is retrieved from the laser modes measured at the exits of discharged capillaries of different lengths under the same discharge conditions. With the gas pressure, peak discharge electric current and capillary radius fixed, the radial density profiles are identical in all the discharged capillaries. The measured laser modes are equivalent to the evolution at discrete positions in a long plasma channel. Compared to former researches based on the spot size at the capillary exit, this method is not affected by the multiple solution problem. The use of a collimated laser eliminates the influences of the divergence angle on the fitting accuracy. By this means, the matched spot sizes of hydrogen-filled capillary discharge waveguides under different gas pressures (5-20mbar) are measured. The results can provide a spot size reference for the laser wakefield accelerator guided in a plasma channel.
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Item type: Article ID code: 66160 Dates: DateEvent3 October 2018Published23 July 2018AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 19 Nov 2018 14:59 Last modified: 13 Oct 2024 00:36 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/66160