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Poster Session I

4:30 pm – 6:30 pm, Tuesday October 14 Session DT4 COEX, Lobby E
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Investigation of Ion Movement Patterns and Properties Within a Magnetic X-point System

Poster 32
Presenter: Alvin Amry Sugianto (KAIST)
Authors: Yegeon Lim (Caltech), Hoiyun Jeong (KAIST), Bin Ahn (KAIST), Young-chul Ghim (KAIST)

The formation of a magnetic null point in an X-point system presents an interesting case for plasma dynamics. Understanding the effect of this uncommon magnetic field configuration, especially on ions, may be influential in progressing plasma research and applications. In this study, a non-invasive optical diagnostic system, Laser-Induced Fluorescence (LIF) is implemented in a multi-dipole chamber called MAXIMUS [1] which is able to simulate a magnetic X-point much like a tokamak divertor. The diagnostic is specially developed focusing on enabling measurements at various locations of the X-point configuration, exploring various magnetic flux line shapes. The properties of ions and how they change due to the magnetic field are inferred and discussed through examining the ion velocity distribution function (IVDF). Especially, detailed analysis at how the IVDF may deviate from the Maxwellian form is done, since it may indicate significant and more interesting phenomena, such as charge exchanges or instability-enhanced collisions.

[1]     Lim, Yegeon, et al. "New low temperature multidipole plasma device with a magnetic X-point and its properties." Plasma Sources Science and Technology 29.11 (2020): 115012.

Funding acknowledgement

This work was supported by the National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Grant Nos. RS-2022-00155917 and NRF- 2021R1A2C2005654)

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