Experimental confirmation of the linear relation between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

• Published in: Plasma science & technology Vol. 26; no. 8; pp. 85104 - 85108
• Main Authors: DONG, Lili, WANG, Mingyuan, LIU, Wenjun, SHI, Yuejiang, DONG, Jiaqi, GUO, Dong, SUN, Tiantian, GU, Xiang, SONG, Xianming, YUAN, Baoshan, PENG, Yueng-Kay Martin, Team, the ENN
• Format: Journal Article
• Language: English
• Published: Plasma Science and Technology 01.08.2024
• Subjects: multi-fluid plasma; plasma equilibrium; Shafranov formula
• ISSN: 1009-0630
• DOI: 10.1088/2058-6272/ad4f23

A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50 (EXL-50) spherical torus, where the energetic electrons play a crucial role in sustaining the plasma current and pressure. In this study, the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field ( B V ), plasma current ( I p ), the poloidal ratio ( β p ) and the Shafranov formula. Remarkably, our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus. This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma. The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.