Working Paper Article Version 1 This version is not peer-reviewed

Probing Electron Properties in ECR Plasmas Using X-Ray Bremsstrahlung and Fluorescence Emission

Version 1 : Received: 30 September 2021 / Approved: 5 October 2021 / Online: 5 October 2021 (08:58:06 CEST)

How to cite: Mishra, B.; Pidatella, A.; Galatà, A.; Biri, S.; Rácz, R.; Naselli, E.; Mazzaglia, M.; Torrisi, G.; Mascali, D. Probing Electron Properties in ECR Plasmas Using X-Ray Bremsstrahlung and Fluorescence Emission. Preprints 2021, 2021100073 Mishra, B.; Pidatella, A.; Galatà, A.; Biri, S.; Rácz, R.; Naselli, E.; Mazzaglia, M.; Torrisi, G.; Mascali, D. Probing Electron Properties in ECR Plasmas Using X-Ray Bremsstrahlung and Fluorescence Emission. Preprints 2021, 2021100073

Abstract

A quantitative analysis of X-ray emission from an electron cyclotron resonance (ECR) plasma was performed to probe the spatial properties of electrons having energy for effective ionisation. A series of measurements were taken by INFN-LNS and ATOMKI, capturing spatially and spectrally resolved X-ray maps as well as volumetric emissions from argon plasma. Comparing the former with model generated maps (involving space-resolved phenomenological electron energy distribution function and geometrical efficiency calculated using ray-tracing MC routine) furnished information on structural aspects of the plasma. Similarly, fitting a model composed of bremsstrahlung and fluorescence to the volumetric X-ray spectrum provided valuable insight into the density and temperature of confined and lost electrons. The latter can be fed back to existing electron kinetics models for simulating more relevant energies, consequently improving theoretical X-ray maps and establishing the method as an excellent indirect diagnostic tool for warm electrons, required for both fundamental and applied research in ECR plasmas.

Keywords

ECR plasmas; warm electrons; self-consistent simulations; experimental benchmarking; volumetric and space-resolved spectra; X-ray fluorescence; bremsstrahlung; ray-tracing Monte Carlo techniques

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