Speaker
Description
Helical targets [1] allow us to focus and post-accelerate a proton beam generated by Target Normal Sheath Acceleration (TNSA) [2]. This scheme uses the discharge current [3] generated by the charge ejection from the laser-plasma interaction. The current will be driven through a conducting helical coil (HC), generating a localised electro-magnetic pulse (EMP) inside the coil which will focus, post-accelerate and bunch part of the TNSA proton beam. This scheme was validated on several experiments [1, 4] and is of great interest for numerous applications, from isochoric heating of dense material to isotopes or neutrons production [5].
I will present the development of a new HC design surrounded by a metallic tube in order to strongly reduce the discharge current dispersion in the HC [6]. Large-scale Particle-In-Cell (PIC) Simulations via SOPHIE [7], a code developed at CEA-CESTA, and theoretical calculations with our own model DoPPLIGHT [8] show a drastic effect of the metallic sheath on the current propagation through the helical targets and, by extension, the EMP generation inside the coil, allowing us to strongly bunch a TNSA proton beam.
References
[1] S. Kar et al, Nature Com. 7, 10792 (2016)
[2] R. A. Snavely et al, Phys. Rev. Lett. 85, 2945 (2000)
[3] F. Consoli et al, High Power Laser Science and Engineering 8, e22 (2020)
[4] M. Bardon et al, Plasma Phys. Control. Fusion 62, 125019 (2020)
[5] Roth et al., Phys. Rev. Lett . 110, 044802 (2013)
[6] A. Hirsch-Passicos et al, Phys. Rev. E 109, 025211 (2023)
[7] O. Cessenat, arXiv, 1301.4539 (2013)
[8] C.L.C. Lacoste et al, Matter Radiat. Extremes 9, 067201 (2024)
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