SUNIST (or Sino-UNIted Spherical Tokamak) is a small spherical tokamak in the Department of Engineering Physics of Tsinghua University, Beijing, China.[1]

Sino-UNIted Spherical Tokamak
Device typeSpherical tokamak
LocationBeijing, China
AffiliationTsinghua University
Technical specifications
Major radius30 cm (12 in)
Minor radius23 cm (9.1 in)
Magnetic field0.15 T (1,500 G) (toroidal)
Plasma current30 kA
Year(s) of operation2002–present
WebsiteSUNIST Laboratory

The main parameters of SUNISTEdit

Parameter Symbol Value
Major radius R 30 cm
Minor radius a 23 cm
Elongation ratio κ 1.6
On-axis magnetic field B0 1500 gauss (0.15 T)
Typical plasma current IP 30 kA

Current research activitiesEdit

Alfven wave current drive experiments in spherical tokamak plasmas Alfven wave can generate toroidal plasma current without density limits. This is very favourable for spherical tokamak plasmas, which have very high dielectric constants that makes LHCD or ECCD very hard.


  1. ^ Ying, Wang; Li, Zeng; Yexi, He; Team, SUNIST (2003). "Initial Plasma Startup Test on SUNIST Spherical Tokamak". Plasma Science and Technology. 5 (6): 2017–2022. doi:10.1088/1009-0630/5/6/001. ISSN 1009-0630.
  • A Research Program of Spherical Tokamak in China
  • Initial Plasma Startup Test on SUNIST Spherical Tokamak
  • News about the construction of the SUNIST shperical tokamak (in Chinese)