Abstract
Direct laser acceleration of ions by short frequency chirped laser pulses is investigated theoretically. We demonstrate that intense beams of ions with a kinetic energy broadening of about 1% can be generated. The chirping of the laser pulse allows the particles to gain kinetic energies of hundreds of MeVs, which is required for hadron cancer therapy, from pulses of energies in the order of 100 J. It is shown that few-cycle chirped pulses can accelerate ions more efficiently than long ones, i.e., higher ion kinetic energies are reached with the same amount of total electromagnetic pulse energy.
Highlights
The interaction of intense laser pulses with solids has recently attracted considerable interest
We found that acceleration by such short pulses may be more efficient than by long chirped pulses, i.e., the same final ion kinetic energies can be reached with a lower pulse energy
In order to assess the efficiency of laser acceleration by means of few-cycle chirped pulses, we perform simulations based on the classical relativistic equations of motion
Summary
The interaction of intense laser pulses with solids has recently attracted considerable interest. This is largely due to its potential application for accelerating charged particles [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. We assume a solid-density or underdense target consisting of carbon ions, typically, bare nuclei, which can be generated via ionization by an intense pre-pulse. The electrons are followed by the carbon ions, which are directly accelerated by the chirped pulse
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