Phase-dependent cross sections of deuteron-triton fusion in dichromatic intense fields with high-frequency limit

TL;DR

This paper studies how strong dichromatic laser fields influence deuteron-triton fusion cross sections, revealing phase and angle-dependent enhancements and shifts in fusion peaks at high frequencies and intensities.

Contribution

It introduces a detailed theoretical analysis of phase-dependent effects on fusion cross sections in dichromatic intense fields, highlighting new mechanisms for peak shifts.

Findings

Coulomb barrier penetrability is enhanced by dichromatic fields.

Fusion cross sections increase significantly compared to field-free conditions.

Two distinct shifts in fusion peaks are identified related to frequency and intensity.

Abstract

We investigate the influence of strong dichromatic laser fields (i.e. 1{\omega}-2{\omega} and 1{\omega}-3{\omega}) with high-frequency limit on the cross sections of deuteron-triton(DT) fusion in Kramers-Henneberger(KH) frame. We focus on the transitions of phase-dependent effects depending on a dimensionless quantity n_{d} , which equals the ratio of the quiver oscillation amplitude to the geometrical touching radius of the deuteron and triton as defined in our previous research. Theoretical calculations show that the angle-dependent as well as phase-dependent Coulomb barrier penetrabilities can be enhanced in dichromatic intense fields, and the corresponding angle-averaged penetrabilities and the fusion cross sections increase significantly compared with field-free case. Moreover, we find that there are twice shifts of the peak in the cross sections whenever the frequency becomes sufficiently low or the intensity sufficiently high. The reason for the first shift is the angle-dependence effects for sub-barrier fusion, while the second shift is due to the accumulation of over-barrier fusion, these mechanisms are analyzed in detail in this paper.