- The physics characteristics of a stellarator are determined to a large extent by the shape of its outer magnetic flux surface.
- A collection of 3D visualizations is given below for stellarator experiments from around the world.
- The color contours show the magnetic field strength on the outer flux surface (red = high field areas, magenta = low field areas).
- Below each figure we give the name and location of the device, its aspect ratio (A), major radius (R₀) and number of field periods N_fp (i.e., stellarators are made up of N_fp equivalent sections), and the optimization methodology used.
- Clicking on each picture takes you on a link to three larger views of the device.
- Clicking on the name of the device takes you to the local web page for that experiment.

W7-X Greifswald, Germany under construction A = 10, R0 = 5.5m, Nfp = 5 quasi-helical with bootstrap current reduction	W7-AS Garching, Germany currently operating, A = 12, R0 = 2m, Nfp = 5 quasi-helical with bootstrap current reduction	CHS Toki, Japan currently operating A = 5, R0 = 1m, Nfp = 8 torsatron	LHD Toki, Japan currently operating A = 6.5, R0 = 3.9m, Nfp = 10 torsatron
ATF Oak Ridge, TN, U.S. no longer operating A = 8, R0 = 2m, Nfp = 12, torsatron	Heliotron E Kytoto, Japan now replaced by Heliotron J A = 5, R0 = 1m, Nfp = 19 torsatron	TJ-II Madrid, Spain currently operating A = 6 to 15, R0 = 1.5m, Nfp = 4 flexible heliac	HSX Madison WI, U.S. currently operating A = 8, R0 = 1.2m, Nfp = 4 quasi-helical symmetry
	QPS Oak Ridge, TN, U.S. proposed A = 2.6, R0 = 1m, Nfp = 2 quasi-poloidal symmetry	NCSX Princeton, NJ, U.S. proposed A = 4.3, R0 = 1.4m, Nfp = 3 quasi-toroidal symmetry