Loading…
Electron density measurement via dual-angle Thomson scattering diagnosis
In this article, we present experiments measuring the electron density of a blown-off aluminum plasma created by a 2 ω (532 nm) laser using dual-angle Thomson scattering diagnosis. By fitting two ion-acoustic-wave feature spectra collected from two angles simultaneously, in a typical shot, the elect...
Saved in:
Published in: | Journal of applied physics 2021-01, Vol.129 (4) |
---|---|
Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | In this article, we present experiments measuring the electron density of a blown-off aluminum plasma created by a 2
ω (532 nm) laser using dual-angle Thomson scattering diagnosis. By fitting two ion-acoustic-wave feature spectra collected from two angles simultaneously, in a typical shot, the electron density obtained 400
μm in front of the target as given by Thomson scattering diagnosis was
(
5.9
±
0.6
)
×
10
18
cm
−
3, which is 35% higher than the average result of
(
4.4
±
0.7
)
×
10
18
cm
−
3 as measured by digital holography diagnosis. The distribution of the electron density along the laser axis from 400
μm to 700
μm as given by dual-angle Thomson scattering was broadly consistent with that obtained from digital holography diagnosis. At a location of 250
μm in front of the target, a unique set of plasma parameters cannot be obtained by dual-angle Thomson scattering diagnosis. This may be a result of the steep density gradient visible in the hologram in this region. Dual-angle Thomson scattering diagnosis can provide a good estimation of the electron density in plasma parameter regimes similar to those in these experiments, in which the scattering parameter
α
<
2. This technique may be useful for small laser facilities that cannot afford a second probe laser with a different wavelength and for measuring electron density with
4
ω Thomson scattering on large laser facilities. This article presents several factors that need to be considered when employing this method. |
---|---|
ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/5.0032388 |