Propagation of attosecond electron bunches along the cone-and-channel target

Abstract

Generation and propagation of attosecond electron bunches along a cone-and-channel target are investigated by particle-in-cell simulation. The target electrons are pulled out by the oscillating electric field of an intense laser pulse irradiating a cone target and accelerated forward along the cone walls. It is shown that the energetic electrons can be further guided and confined by a channel attached to the cone tip. The propagation of these electrons along the channel induces a strong quasistatic magnetic field as well as a sheath electric field since a part of the energetic electrons expands into the surrounding vacuum. The electromagnetic field in turn confines the surface currents. With the cone-and-channel target the energetic electrons can be much better collimated and propagate much farther than that from the classical cone target.

Enhanced dense attosecond electron bunch generation by irradiating an intense laser on a cone target

“…Considering the fact that the electron bunch moves in the direction of the laser propagation with the light speed c, the corresponding duration of the bunch is in the attosecond domain. 18,23,24 With time going on, the transverse length of the electron bunches becomes larger and the thickness (duration) gets smaller as they co-move with the laser pulse. This can be attributed to the Gaussian profile of the incident laser pulse.…”

Generation of high-energy-density ion bunches by ultraintense laser-cone-target interaction

“…21,22 In a number of TNSA experiments, flat-top conical targets have been used as a means to enhance the energy conversion in hot electrons using a linearly polarized laser pulse and have also been proposed as a possible way to enhance the laser intensity near the tip, in addition, to any external focusing. [23][24][25][26][27][28] We investigate here by means of 2D PIC simulations whether such enhancement in intensity can be useful for RPA schemes, and for this purpose, we have tested a number of different target configurations irradiated by circularly polarized laser pulses at high intensities.…”

Enhanced target normal sheath acceleration of protons from intense laser interaction with a cone-tube target

“…9,18,19 A number of theoretical studies, trying to find ways to enhance the proton energy and increase the energy conversion efficiency, have been conducted. The employment of a well designed structured target has been proved to be effective on electron and/or proton acceleration, 8 for example, the employment of cone target, [20][21][22][23] nanotube, 24 half cavity, 25 plasma fiber, 26,27 and the longitudinal front structures like hole, 28 capillary, [29][30][31] nanolayers, 32 slab/stick arrays, 33 or even other shapes. 34 In this paper, we proposed to use a cone-tube target, which consists of a cone attached to the front of a hollow tube, and a foil attached to its rear side, as shown in Fig.…”