NDLI: Energetic Ion Generation by an Ultra-Intense Laser Pulse on Various Plasma Foil Targets

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Energetic Ion Generation by an Ultra-Intense Laser Pulse on Various Plasma Foil Targets

Content Provider	Semantic Scholar
Author	Toshio, Okada Kota, Okubo Yuichi, Mikado Michio, Sugie
Copyright Year	2006
Abstract	High energetic ion generation from thin foil targets irradiated by 30 fs laser pulses at intensity 10 20 W/cm 2 has been studied as a function of various targets with various concaves. We have demonstrated an increased acceleration and higher ion energies for the targets with triangle concave by using particle-in-cell (PIC) sim- ulations. The optimum target plasma conditions for the maximum ion acceleration are found. Mechanism of fast (multi-MeV) ion acceleration in the rear of the targets with triangle concaves is analyzed. 2.PIC simulation We apply a PIC method to simulate the interaction of a plasma layer with an intense ultra-short laser pulse. The method is based on the electromagnetic PIC and is appropriate for analysis of the dynamics of over dense plasmas created by arbitrarily polarized, obliquely inci- dent laser pulses. The 2D (using a Cartesian coordinate system) relativistic, electromagnetic code is used to cal- culate the interaction of an intense laser pulse with an over-dense plasma. Simulations are performed for laser wave length of 1.06µm and laser intensity 10 20 W/cm 2 with a 30 fs pulse width. The transverse focal spot pro- file is Gaussian with a diameter of 4µm. The back- ground electron density is 20 nc. Simulations are made for target thickness of 3µm with 1µm density gradi- ent. Simulation box is 12µm wide 70µm long. The time step is chosen to be 0.1/ωL where ωL is the laser frequency, and the grid size is chosen to be 0.2 c/ωL where c is the speed of light. The time step normalized by the electron plasma frequency becomes about 0.447 which is large for the simulation, but the simulation re- sults are valid because that the total energy is conserved in the simulation time. The number of spatial grids and particles are 2000 × 360 and 10 6 , respectively.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.jspf.or.jp/JPFRS/PDF/Vol7/jpfrs2006_07-142.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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