Performance predictions of the SPARC x-ray crystal spectrometers for ion temperature and toroidal rotation measurements

C Perks; D Vezinet; J E Rice; M L Reinke

doi:10.1063/5.0219521

Performance predictions of the SPARC x-ray crystal spectrometers for ion temperature and toroidal rotation measurements

Rev Sci Instrum. 2024 Aug 1;95(8):083555. doi: 10.1063/5.0219521.

Authors

C Perks¹, D Vezinet², J E Rice¹, M L Reinke²

Affiliations

¹ Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
² Commonwealth Fusion Systems, Devens, Massachusetts 01434, USA.

PMID: 39189877
DOI: 10.1063/5.0219521

Abstract

SPARC will be outfitted with three systems of x-ray crystal spectrometer arrays. Two of these are designed using cylindrically bent crystals to achieve high spectral-resolution for ion temperature and toroidal velocity measurements via imaging He-like Kr and Ne-like Xe. The last acts as a spectral survey system to monitor Ne-like W and nearby H- and He-like emission from Cr, Fe, Co, Ni, and Cu. Line radiation intensities are calculated using the Flexible Atomic Code for atomic data and ColRadPy for collisional-radiative modeling, then convoluted with a Voigt line shape. Free-free, free-bound, and two-photon continuum radiation is also included. The ToFu code is used to perform volume-of-sight integration to produce synthetic detector images. In addition, presented is cross-validation performed using the XICSRT Monte Carlo ray-tracing code. Ion temperature and toroidal velocity profiles are reconstructed using ToFu via tomographic inversion.