Abstract Details
Abstracts
Author: Marcin Kopański
Requested Type: Poster
Submitted: 2025-03-14 12:38:21
Co-authors: R. Bielajew, N.T. Howard, M.E. Austin, A.E. White
Contact Info:
MIT Plasma Science and Fusion Center
77 Massachusetts Ave
Cambridge, MA 02139
USA
Abstract Text:
Electron cyclotron emission (ECE) radiometry is a well-established diagnostic technique capable of providing high spectral and temporal resolution measurements of electron temperature profiles in toroidally confined plasmas. However, for many years, there have been reports of discrepancy between ECE and Thomson scattering measurements. This poster will present two formulations for ECE and identify a possible candidate for the discrepancy between two diagnostics. The initial model is based on the ECESIM code [1], which assumes plasma in a thermodynamic equilibrium and treats the emission-absorption phenomena using power transfer [2]. This established framework is compared with a further enhanced model which utilizes generalized expressions for optical constants [3]. A heuristic bipolar model of perturbed Maxwellian [4] is applied to the novel modelling tool. Performance of the code is evaluated by deployment of both models across three different machines. Calculations are compared with experimental ECE measurements from Alcator C-Mod and DIII-D. Prediction of ECE behavior is projected for SPARC. A variety of perturbations to the distribution function and the effect on ECE are investigated computationally. The ECE model is applied to a database of Alcator C-Mod data to study the implications of a perturbed distribution function for the Thomson-ECE discrepancy.
[1] M.E. Austin, U. Texas FRC Report #534
[2] M. Bornatici et al 1983 Nucl. Fusion 23 1153
[3] G. Giruzzi 1988 Nucl. Fusion 28 1413
[4] G. Giruzzi 2023 EPJ Web Conf. 277 03005
Work funded by US DoE Award DE-SC0014264, Commonwealth Fusion Systems under RPP031, and nT-Tao.
Characterization: 4.0
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