Experimental Study of the Particle Pinch in the Helically Symmetric eXperiment

Future fusion reactors will likely benefit from peaked density profiles for the main ion species.These depend on the interplay between particle transport (neoclassical and anomalous), sources and sinks. An ability to understand particle transport coefficients and the plasmas source is therefore critical.

This work determines diffusive and convective particle transport coefficients via density modulation experiments and parameter fitting routines on the HSX stellarator [1]. Bayesian Inference is utilized in combination with a synthetic interferometer diagnostic based on the pySTRAHL code [2,3]. Neoclassical transport coefficients are determined via the SFINCS code and initial results from an ECM3-EIRENE Hα synthetic diagnostic are presented to model the plasma source [4-8].

contact: dionysi.damaskopoulos@wisc.edu

[1] J. M. Canik, et al.,Phys. Rev. Lett. (2007)

[2] C. Swee, et al., Plasma Phys. Control. Fusion. (2021)

[3] U. von Toussaint, Rev. Mod. Phys. (2011)

[4] M. Landreman,et al., Physics of Plasmas. (2014)

[5] A. Mollen, et al., Plasma Phys. Control. Fusion. (2018)

[6] Y. Feng, et al., Journal of Nuclear Materials. (1997)

[7] Y. Feng, et al, Physics of Plasmas. (2005)

[8] H. Frerichs et al., Review of Scientific Instruments. (2016).