Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Foam Au driven by 4$\omega$ - 2$\omega$ ignition laser pulse for
  inertial confinement fusion   Green light (2$\omega$) has the potential to drive ignition target for laser
fusion with significantly more energy than blue light (3$\omega$) and a
relatively higher damage threshold for the optic components in the final optic
assembly, but it has issues of a relatively low laser to x-ray conversion
efficiency and a hard x-ray spectrum as compared to 3$\omega$. In this paper,
we propose to drive a foam hohlraum wall with an ignition laser pulse by taking
a 4$\omega$ laser at the pre-pulse and a 2$\omega$ laser at the main-pulse,
called as 4$\omega$ - 2$\omega$ ignition pulse. This novel design has the
following advantages: (1) benefiting from 2$\omega$ of its relatively high
energy output and low damage threshold during main-pulse, (2) benefiting from
foam in its relatively high laser to x-ray conversion efficiency and relatively
low M-band fraction in re-emission, (3) benefiting from 4$\omega$ of its low
LPI during pre-pulse. From our 1D simulations with Au material, the laser to
x-ray conversion in a foam driven by 4$\omega$ - 2$\omega$ pulse has an
increase of $28\%$ as compared to a solid target driven by 3$\omega$ with the
same pulse shape. The relatively thin optical depth of foam is one of the main
reasons for the increase of laser to x-ray conversion efficiency inside a foam
target.

8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph