Strongly coupled plasma states produced in supercritical fluids
- Title
- Strongly coupled plasma states produced in supercritical fluids
- Authors
- YUN, GUNSU; LEE, JUHO; KIM, DONG EON
- Date Issued
- 2023-06-29
- Publisher
- Osaka University
- Abstract
- High-density strongly coupled plasma (SCP) states are ubiquitous in the universe including the inner
layers of stars, the core of Jupiter-like planets, and perhaps many electrical discharges in high pressure
atmospheres of planets. To understand transport and thermodynamic properties of such states, we built
an experiment to produce high-density SCPs in supercritical fluid (SCF) using laser pulse and high
voltage bias. The SCF medium is chosen to minimize energy loss via phase transitions and particle
transport [1]. For ns laser pulse on argon SCF at 100 bar, SCPs are generated with electron density ~
1027 m-3 and temperature ~ 1 eV, corresponding to the Coulomb coupling parameter of the order of unity
[2]. Combination with high voltage bias extends the lifetime of the SCP state from a few 100s ns to a
few µs, opening an opportunity for precision measurements. For fs laser pulse, SCPs are generated with
similar electron density and temperature, which suggests that the ionization potential reduction is the
dominant ionization mechanism to attain the high electron density. This implies that the medium density
determines the electron density of the SCP.
*This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry
of Science and ICT (Nos. 2019R1A2C3011474, 2022M3H4A1A04074153, and RS-2022- 00154676).
[1] Seungtaek Lee et. al., Quasi-equilibrium phase coexistence in single component supercritical
fluids, Nature Communications 12, 4630 (2021)
[2] Seungtaek Lee, Juho Lee et. al., Characterization of strongly coupled plasmas produced in argon
supercritical fluids, Plasma Physics and Controlled Fusion 64, 095010 (2022)
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/119848
- Article Type
- Conference
- Citation
- The 11th International Workshop on Warm Dense Matter 2023, 2023-06-29
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.