Determination of radial electric field from Pfirsch–Schlüter flows in the HSX stellarator. (6th February 2017)

• Record Type: Journal Article
• Authors: Kumar, S.T.A.; Talmadge, J.N.; Dobbins, T.J.; Anderson, F.S.B.; Likin, K.M.; Anderson, D.T.
• Is Part Of: Nuclear fusion. Volume 57:Number 3(2017:Mar.)
• Publication Date: 2017-02-06
• Subjects: stellarator -- radial electric field -- Pfirsch–Schlüter flows; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/aa52a2
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Inboard/outboard asymmetry in the impurity ion parallel flow is observed in the HSX stellarator using charge exchange recombination spectroscopy (CHERS). This observation shows the presence of counter-streaming Pfirsch–Schlüter flow predicted by neoclassical theory. The asymmetry of the flow is used to calculate the magnitude and direction of the radial electric field ( E r ), as well as the mean flow, using computed magnetic geometry factors. This method enables calculation of E r near the core of the HSX plasma where the E r obtained from the radial force balance equation has large uncertainties due to the relatively large width of the diagnostic neutral beam with respect to the plasma minor radius.