Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mapping the self-generated magnetic fields due to thermal Weibel
  instability   Weibel-type instability can self-generate and amplify magnetic fields in both
space and laboratory plasmas with temperature anisotropy. The electron Weibel
instability has generally proven more challenging to measure than its ion
counterpart owing to the much smaller inertia of electrons, resulting in a
faster growth rate and smaller characteristic wavelength. Here, we have probed
the evolution of the two-dimensional distribution of the magnetic field
components and the current density due to electron Weibel instability, in $\rm
CO_2$-ionized hydrogen gas (plasma) with picosecond resolution using a
relativistic electron beam. We find that the wavenumber spectra of the magnetic
fields are initially broad but eventually shrink to a narrow spectrum
representing the dominant quasi-single mode. The measured $k$-resolved growth
rates of the instability validate kinetic theory. Concurrently,
self-organization of microscopic plasma currents is observed to amplify the
current modulation magnitude that converts up to $\sim 1\%$ of the plasma
thermal energy into magnetic energy.

13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
9
The categories of this paper are: nlin