Presentation Title

Axial plasma detachment in the Controlled Shear Decorellation eXperiment (CSDX)

Faculty Mentor

Saikat Chakraborty Thakur PhD

Start Date

18-11-2017 2:15 PM

End Date

18-11-2017 3:15 PM

Location

BSC-Ursa Minor 149

Session

Poster 3

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

Controlled Shear Decorellation eXperiment (CSDX) is a Radio-Frequency (RF) heated helicon plasma device used to study plasma turbulence. Recently, during a magnetic field scan, we discovered a global transition in the plasma equilibrium of CSDX at a certain magnetic field (B_critical). This transition is accompanied with axial plasma detachment along the length of the plasma column. Plasma detachment studies are crucial for the design of thermonuclear fusion reactors. Hence, we investigate the onset of axial plasma detachment at B_critical. We study the variation of the B_critical as a function of various source parameters such as the RF power, gas pressure etc. In this project, we use spectroscopy and neutral pressure measurements to study the axial plasma detachment, by measuring the relative ratios of ions and neutrals in argon plasma at multiple axial positions. This information is also crucial to establish the global nature of the transition and the local effects of axial plasma detachment. These spectroscopic measurements will also be compared to other diagnostics (Langmuir probes, fast-camera etc.) used to characterize the plasma transition.

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Nov 18th, 2:15 PM Nov 18th, 3:15 PM

Axial plasma detachment in the Controlled Shear Decorellation eXperiment (CSDX)

BSC-Ursa Minor 149

Controlled Shear Decorellation eXperiment (CSDX) is a Radio-Frequency (RF) heated helicon plasma device used to study plasma turbulence. Recently, during a magnetic field scan, we discovered a global transition in the plasma equilibrium of CSDX at a certain magnetic field (B_critical). This transition is accompanied with axial plasma detachment along the length of the plasma column. Plasma detachment studies are crucial for the design of thermonuclear fusion reactors. Hence, we investigate the onset of axial plasma detachment at B_critical. We study the variation of the B_critical as a function of various source parameters such as the RF power, gas pressure etc. In this project, we use spectroscopy and neutral pressure measurements to study the axial plasma detachment, by measuring the relative ratios of ions and neutrals in argon plasma at multiple axial positions. This information is also crucial to establish the global nature of the transition and the local effects of axial plasma detachment. These spectroscopic measurements will also be compared to other diagnostics (Langmuir probes, fast-camera etc.) used to characterize the plasma transition.