Status of the DNB based ITER CXRS and BES diagnostic

Hellermann, M. von; Jaspers, R.; Biel, W.; Litnovsky, A.; Neubauer, O.; Pap, M.; Hawkes, N. C.; Marren, C.; Walton, B.; Serov, V. V.; Tugarinov, S. N.; Vliegenthart, Willem A.; Moddemeijer, K.; Walker, C.; Ingesson, C.

doi:10.1063/1.2229222

Cited by 13 publications

(7 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Simulation of Spectra (SOS) 1 project has been started at JET back in the mid-nineties with the main purpose of developing a tool capable of predicting reliably expected spectroscopic diagnostic performance of future fusion devices such as ITER [5][6][7] or EAST [8,9], and even more importantly, to use experimental results from existing fusion devices as a bench-marking tool. The background is a comprehensive data base gained from the JET CXRS diagnostic [10] which uses advanced spectral analysis codes (CXSFIT, [11]) and CX data processing code Charge Exchange Analysis Package (CHEAP).…”

Section: Introduction To the Sos Projectmentioning

confidence: 99%

Simulation of Spectra Code (SOS) for ITER Active Beam Spectroscopy

Hellermann

Bock

Marchuk

et al. 2019

Atoms

View full text Add to dashboard Cite

The concept and structure of the Simulation of Spectra (SOS) code is described starting with an introduction to the physics background of the project and the development of a simulation tool enabling the modeling of charge-exchange recombination spectroscopy (CXRS) and associated passive background spectra observed in hot fusion plasmas. The generic structure of the code implies its general applicability to any fusion device, the development is indeed based on over two decades of spectroscopic observations and validation of derived plasma data. Four main types of active spectra are addressed in SOS. The first type represents thermal low-Z impurity ions and the associated spectral background. The second type of spectra represent slowing-down high energy ions created from either thermo-nuclear fusion reactions or ions from injected high energy neutral beams. Two other modules are dedicated to CXRS spectra representing bulk plasma ions (H+, D+, or T+) and beam emission spectroscopy (BES) or Motional Stark Effect (MSE) spectrum appearing in the same spectral range. The main part of the paper describes the physics background for the underlying emission processes: active and passive CXRS emission, continuum radiation, edge line emission, halo and plume effect, or finally the charge exchange (CX) cross-section effects on line shapes. The description is summarized by modeling the fast ions emissions, e.g., either of the α particles of the fusion reaction or of the beam ions itself.

show abstract

Section: Introduction To the Sos Projectmentioning

confidence: 99%

Simulation of Spectra Code (SOS) for ITER Active Beam Spectroscopy

Hellermann

Bock

Marchuk

et al. 2019

Atoms

View full text Add to dashboard Cite

show abstract

“…7 The light from the tokamak arrives to the spectrometer with a single fiber bundle and is split into three wavelength ranges, allowing simultaneous measurement of carbon, helium, and hydrogen spectra on three different detectors. Consequently, the impurity spectrum, namely, carbon or helium, and the beam emission spectrum are measured on exactly the same lines-of-sight.…”

Section: A High Etendue Spectrometer For Iter Core Cxrs Measurementsmentioning

confidence: 99%

Method to obtain absolute impurity density profiles combining charge exchange and beam emission spectroscopy without absolute intensity calibration

Kappatou

Jaspers

Delabie

et al. 2012

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

Investigation of impurity transport properties in tokamak plasmas is essential and a diagnostic that can provide information on the impurity content is required. Combining charge exchange recombination spectroscopy (CXRS) and beam emission spectroscopy (BES), absolute radial profiles of impurity densities can be obtained from the CXRS and BES intensities, electron density and CXRS and BES emission rates, without requiring any absolute calibration of the spectra. The technique is demonstrated here with absolute impurity density radial profiles obtained in TEXTOR plasmas, using a high efficiency charge exchange spectrometer with high etendue, that measures the CXRS and BES spectra along the same lines-of-sight, offering an additional advantage for the determination of absolute impurity densities.

show abstract

“…For suppressing the passive background features the beam modulation technique is routinely applied at ASDEX Upgrade. However, in the case when the ionization equilibrium is affected by switching on the diagnostic beam and the background neutral density is changed compared to the beam-off phase, this technique fails [12]. Hence, a tool which characterizes the passive background line emission and does not rely on beam modulation helps to quantify the passive components in an active CX spectrum.…”

Section: Edge Cxrs Diagnostic At Asdex Upgradementioning

confidence: 99%

Investigation of passive edge emission in charge exchange spectra at the ASDEX Upgrade tokamak

Viezzer

Pütterich

Dux

et al. 2011

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

Abstract. The influence of passive edge emission on the charge exchange spectra of carbon (C 5+ , n=8→7 at 529 nm) measured in fusion plasmas at the ASDEX Upgrade tokamak is investigated. The spectra are obtained viewing the plasma edge tangentially with 8 lines of sight while the plasma is swept to enhance the spatial density of the measurements. A forward model to deconvolute the measured line-integrals is employed. The local emissions are then compared to the simulated radiation obtained with the 1-D impurity transport code STRAHL using transport coefficients which are determined independently. Depending on the background neutral deuterium densities the simulation predicts the absolute line intensities and the relative contributions of electron impact excitation and thermal charge exchange to the measured signals. Therefore, a background neutral deuterium density profile has been determined. For the passive emission line of C 5+ , the comparison between forward model and simulations yields that electron impact excitation and thermal charge exchange are both important for understanding the passive line. Indeed, thermal charge exchange proves to be affecting the passive emission line considerably via two mechanisms, i.e. change of ionization equilibrium through charge exchange recombination and radiation due to local charge exchange reactions.

show abstract

Status of the DNB based ITER CXRS and BES diagnostic

Cited by 13 publications

References 4 publications

Simulation of Spectra Code (SOS) for ITER Active Beam Spectroscopy

Simulation of Spectra Code (SOS) for ITER Active Beam Spectroscopy

Method to obtain absolute impurity density profiles combining charge exchange and beam emission spectroscopy without absolute intensity calibration

Investigation of passive edge emission in charge exchange spectra at the ASDEX Upgrade tokamak

Contact Info

Product

Resources

About