Laser-Plasma Generation

Depending on their mass, charge and density, here = the electron plasma frequency, which is the ion plasma frequency. Plasma is considered to be an electron cloud with heavy ion background, and collisions are almost ignored according to Drude model. This is the reason why the dielectric constant of an electron can be expressed by an equation. Where is the plasma frequency? The laser frequency due to the plasma frequency is expressed as a relationship between the plasma frequency and the laser frequency and can also be used as a boundary between the conducting behavior and the dielectric behavior of the laser.

In the plasma beat wave accelerator (PBWA), the relationship between energy and momentum conservation is satisfied because the kinetic power of the two lasers separated by the plasma frequency generates a relativistic plasma wave. 1! 2! ! p; 1 / 2k2 = kp where (! 1; 2; k1; 2) is the frequency and wave number of each of the two lasers. Number of electrons in the laser field E1. As the electron plasma wave grows the magnitude of the electric field given by Equation 1 becomes sufficiently large that the velocity of the electrons oscillating in the electric field becomes relativistic and the plasma frequency undergoes a small red shift [P! p] = ¿. 1/2316 Due to the increase in mass theory, 1/22. The red shift of this frequency saturates the wave with 5.

Figure Laser driven plasma accelerator is used to generate undulator radiation. The laser pulse (red) is focused on the plenum, where the plasma wave accelerates the electron (yellow) to several hundred MeV of energy. The electron beam is calibrated by a pair of quadrupole lenses. Plasma radiation and laser beam are blocked by aluminum foil. Electrons propagate through the undulator and emit soft X-ray radiation in the forward direction (blue) into a narrow cone. Radiation is collected by a spherical gold mirror featuring a transmission grating combined with an X-ray CCD camera. Stray light is blocked by the slit in front of the lattice. The direction, divergence and spectrum of the electron beam are diagnosed by the screen. This method is used to generate soft X-rays with a wavelength of 17 nm. ]

Laser pulse and excited electron plasma wave These waves are due to the shift of the leading edge of the laser pulse. When the laser pulse length cλ L is longer than the electron plasma wavelength, the energy of the plasma wave is reabsorbed by the tail of the laser pulse. However, if the pulse length is equal to or shorter than the plasma wavelength c L p, the mass power excites the plasma wave or the tail field and its phase velocity is equal to the laser group velocity and not reabsorbed. Therefore, a pulse rising sharply or a pulse sharply decreasing in the range of c / πp will excite the wake. With the development of high intensity lasers, the concept of laser tail field, first proposed by Tajima and Dawson in 1979, has become a reality. The focus strength of this laser is 1019 Wcm - 2, a 0 ≥ 1, which is a strong nonlinear relativistic system.