  We propose a new way of axial magnetic fields generation in a
non-relativistic laser intensity regime by using a twisted light carrying
orbital angular momentum (OAM) to stimulate two-plasmon decay (TPD) in a
plasma. The growth of TPD driven by an OAM light in a Laguerre-Gauss (LG) mode
is investigated through three dimensional fluid simulations and theory. A
theory based on the assumption that the electron plasma waves (EPWs) are
locally driven by a number of local plane-wave lasers predicts the maximum
growth rate proportional to the peak amplitude of the pump laser field and is
verified by the simulations. The OAM conservation during its transportation
from the laser to the TPD daughter EWPs is shown by both the theory and the
simulations. The theory predicts generation of ~40T axial magnetic fields
through the OAM absorption via TPD, which has perspective applications in the
field of high energy density physics.
