Using the Steepened Plasma Profile and Wave Breaking Threshold in Laser‐Plasma Interaction

Abstract

Key words Electron, high intense, plasma accelerator, laser wake field, bubble regime, wave break. PACS 41.75.Jv, 41.75.Lx In this work we evaluate the interaction of high intense laser beam with a steepened density profile. During laser interaction with underdense plasma by freely expanding plasma regime, modification of density profile is possible. In this paper we have investigated the ultra short laser pulse interaction with nonisothermal and collisionless plasma. We consider self-focusing as an effective nonlinear phenomenon that tends to increase when the laser power is more than critical rate. By leading the expanded plasma to a preferred location near to critical density, laser reflection is obtained, so the density profile will be locally steepened. The electromagnetic fields are evaluated in this new profile. We show the amplitude and period of electrical field oscillation are increased by reducing the steepened scale length. Also our numerical results identify that by reducing the steepened scale length, the electrical field is increased to wave breaking threshold limit. This high gradient electrical field causes the effective beam loading during the wave breaking phenomenon. The wave breaking can be the initial point for other acceleration regime as cavity or channel guiding regime.

Enhancement of electron density in the interaction of high‐power electromagnetic waves with inhomogeneous magnetized plasma

“…Moreover, the modification of a homogeneous density profile to a steepened density profile is possible when we freely expand the plasma regime during high‐intensity laser–plasma interactions. [ 17 ] Kant et al [ 18 ] investigated the self‐focusing of a short Gaussian laser pulse under inhomogeneous plasma density conditions. Taguchi et al [ 19 ] studied the structure of a cylindrical electron beam in a laser‐produced plasma.…”

Research on Minimum Energy Excited to Plasma Coating for Reducing Radar Cross Section of Target

“…However, these techniques may not be effective in some situations where the use is for a wide-band radar wave frequency [1]. Since 1990s, plasma stealth technology has been paid attention to [2][3][4][5][6][7][8][9]. It is found that inhomogeneous plasma behaves as frequency selective medium and can be used as a broadband absorbing layer in general shielding and military stealth applications [2].…”

“…Electron density profile affects the reflection, absorption and transmission of the electromagnetic energy in plasma for such application. In literature, different electron density functions are considered such as exponential, parabolic, steepened, hyperbolic, tangent, sinusoidal and exponential with time variation [4][5][6]8]. In laboratory, we use the spatial distribution of plasma electron density which is measured for illustration [10].…”

Interaction of Electromagnetic Wave and Plasma Slab With Partially Linear and Sinusoidal Electron Density Profile

“…The subject of interaction of electromagnetic waves and tunable plasma mediums has been studied by various authors and attracted growing attention as an important topic in plasma applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. By using plasmas as cover layers, optimal reflection, absorbtion and transmission performances required in stealth applications, radio communications, radio astronomy etc.…”

“…In literature, various electron density functions of the plasma layer are considered such as exponential, parabolic and steepened profiles to obtain special characteristics [8,10,15]. In a very recent study, sinusoidal electron distribution is analyzed, and resulting frequency selective characteristics are discussed as the function of sinusoidal profile parameters and external magnetic field excitation [16].…”