Matter and Radiation at Extremes, 2016, 1 (4): 187, Published Online: May. 9, 2017
Proton radiography of magnetic fields generated with an open-ended coil driven by high power laser pulses
Strong magnetic field Strong magnetic field Laser-driven coil targets Laser-driven coil targets Proton radiography Proton radiography
Abstract
Recently generation of strong magnetic (B) fields has been demonstrated in capacitor coils heated by high power laser pulses [S. Fujioka et al., Sci. Rep. 3, 1170 (2013)]. This paper will present a direct measurement of B field generated with an open-ended coil target driven by a nanosecond laser pulse using ultrafast proton radiography. The radiographs are analyzed with particle-tracing simulations. The B field at the coil center is inferred to be ~50 T at an irradiance of -5×1014 W?cm2. The B field generation is attributed to the background cold electron flow pointing to the laser focal spot, where a target potential is induced due to the escape of energetic electrons.
Guoqian Liao, Yutong Li, Baojun Zhu, Yanfei Li, Fang Li, Mengchao Li, Xuan Wang, Zhe Zhang, Shukai He, Weiwu Wang, Feng Lu, Faqiang Zhang, Lei Yang, Kainan Zhou, Na Xie, Wei Hong, Yuqiu Gu, Zongqing Zhao, Baohan Zhang, Jie Zhan. Proton radiography of magnetic fields generated with an open-ended coil driven by high power laser pulses[J]. Matter and Radiation at Extremes, 2016, 1(4): 187.
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