The Core-Plasma CXRS Diagnostic for ITER: An Introduction to the Current Design

Mertens, Philippe

doi:10.1007/s10894-018-0202-1

Cited by 13 publications

(8 citation statements)

References 52 publications

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“…Now, since the collision cross-section, 〈Q i,j 〉, between beam particles and bulk plasma impurities decreases with beam energy in the range of 50-100 keV amu −1 for hydrogen, here, i stands for a neutral beam particle and j stands for impurities (He, C, W); using a beam with such energies would result in reduced SNR. Therefore, a suitable energy DNB (<50 keV amu −1 , for H) was developed [40,41]. The CX process is shown in equation (1), where the intensity of the spectra is given in equation (2).…”

Section: Spectral Simulation Modelmentioning

confidence: 99%

Comparing simulated and experimental spectral line splitting in visible spectroscopy diagnostics in the HL-2A tokamak

Wu¹,

Du²,

Chen³

et al. 2023

Plasma Sci. Technol.

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We established Passive-Visible Spectroscopy Diagnostics (P-VSD) and Active-VSD (A-VSD) spectral splitting models for HL-2A Tokamak. Spectral splitting is due to the influence of electromagnetic (EM) fields on the spectral lines in VSD diagnostics. Zeeman splitting induced by the magnetic field (B) in P-VSD is used to distinguish reflection light overlap in the divertor. Stark splitting caused by the Lorentz electric field (ELorentz) from the Neutral Beam Injection (NBI) particle's interaction with the magnetic field (Vbeam×B) is used to measure the safety factor q in A-VSD. We give a comparison and error analysis by fitting the experimental spectra with the simulation results. The distinguishing of edge (Scrape-Off Layer, SOL, and divertor) Hydrogen/Deuterium (H/D) spectral lines and the q profile derived from the spectra provide a reference for the HL-2M VSD design.

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Section: Spectral Simulation Modelmentioning

confidence: 99%

Comparing simulated and experimental spectral line splitting in visible spectroscopy diagnostics in the HL-2A tokamak

Wu¹,

Du²,

Chen³

et al. 2023

Plasma Sci. Technol.

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“…This has several consequences for the design of beam aided diagnostics. In the case of charge exchange recombination spectroscopy (CXRS) [4], the precipitous drop-off in charge-exchange cross section at high beam energy would mean a very low signal. However, for the motional Stark effect (MSE) diagnostic, the excitation cross section is only slightly lower and does not have much effect.…”

Section: Beam Energy and Viewsmentioning

confidence: 99%

ITER beam aided diagnostics

Levinton¹,

Reichert²,

Bock³

2022

J. Inst.

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We provide an overview of ITER beam aided diagnostics, including the motional Stark effect (MSE) and charge exchange recombination spectroscopy (CXRS). ITER presents several unique challenges to plasma diagnostics in general and beam-aided diagnostics in particular. The large size, long pulse, and DT operation drives much of the diagnostic design. This in turn has driven a significant R&D effort concerning the maintenance of plasma facing mirrors with sufficient reflectivity to maintain the utility of the diagnostic. In the case of MSE a new approach utilizing spectral splitting will be pursued instead of the conventional polarimetry approach due to the difficulty of maintaining and calibrating the polarizations properties of the plasma facing mirror.

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“…Only the knowledge of the applied potential and the observation angle was required. Especially the last condition made the emission of reflected atoms attractive in the application for the challenges of fusion plasmas [24]. The impact of the angular distribution of atoms on the emission profiles is exemplified in Figure 7b.…”

Section: Balmer-α Line Emission In H and Arh Plasmasmentioning

confidence: 99%

Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory

Marchuk

Dickheuer

Ertmer

et al. 2019

Atoms

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In this work, we present a new application for the line shapes of emission induced by reflected hydrogen atoms. Optical properties of the solids in contact with the plasma could be effectively measured at the wavelength of Balmer lines: time-resolved measurements of reflectance and polarization properties of mirrors are performed using the wavelength separation of the direct and reflected signals. One uses the Doppler effect of emission of atoms excited by collisions with noble gases, primarily with Ar or with Kr. In spite of a new application of line shapes, the question of the source of the strong signal in the case of Ar exists: the emission observed in the case of the excitation of H or D atoms by Ar exceeds the signal induced by collisions with Kr atoms by a factor of five, and the only available experimental data for the ground state excitation show practically equal cross-sections for both gases in the energy range of 80–200 eV.

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The Core-Plasma CXRS Diagnostic for ITER: An Introduction to the Current Design

Cited by 13 publications

References 52 publications

Comparing simulated and experimental spectral line splitting in visible spectroscopy diagnostics in the HL-2A tokamak

Comparing simulated and experimental spectral line splitting in visible spectroscopy diagnostics in the HL-2A tokamak

ITER beam aided diagnostics

Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory

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