Yacora on the Web: Online collisional radiative models for plasmas containing H, H2 or He

Wünderlich, D.; Giacomin, Maurizio; Ritz, Raphael; Fantz, U.

doi:10.1016/j.jqsrt.2019.106695

Cited by 35 publications

(58 citation statements)

References 59 publications

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“…In this, the ratio between the plasmamolecule interaction contributions of Dβ and Dα is used to separate D + 2 and D − related contributions. BaSPMI makes use of collisional-radiative model data from ADAS (atomic data) [39,40] and Yacora [28,29] (plasma-molecule interactions), as well as reaction rates from AMJUEL [41]. It is assumed that all this hydrogenic data can be directly applied to a deuterium plasma, which is further discussed in [30].…”

Section: Experimental Results On Tcvmentioning

confidence: 99%

“…These diagnostics could be used for providing verification on the collisional-radiative model results used. More complete sets of the fundamental data for the isotopologues is also starting to become available [69], which can be used by collisional-radiative models [28,29] to provide data for deuterium and tritium. Verifying these new (vibrationally-resolved) results [69] in dedicated experiments for H, D and T , as well as using them in vibrationally resolved plasma-edge simulations, is crucial for determining what impact plasma-molecule interactions have on plasma-edge physics in fusion reactors.…”

Section: Ion Flow Into Outer Divertor Legmentioning

confidence: 99%

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A study of the influence of plasma–molecule interactions on particle balance during detachment

Verhaegh

Lipschultz

Harrison

et al. 2021

Nuclear Materials and Energy

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This paper shows experimental results from the TCV tokamak that indicate plasma-molecule interactions involving D + 2 and possibly D − play an important role as sinks of energy (through hydrogenic radiation as well as dissociation) and particles during divertor detachment if low target temperatures (< 3 eV) are achieved. Both molecular activated recombination (MAR) and ion source reduction due to a power limitation effect are shown to be important in reducing the ion target flux during a core density ramp. In contrast, the electron-ion recombination (EIR) ion sink is too small to play an important role in reducing the ion target flux. MAR or EIR do not occur during N 2 seeding induced detachment as the target temperatures are not sufficiently low.The impact of D + 2 is shown to be underestimated in present (vibrationally unresolved) SOLPS-ITER simulations, which could result from an underestimatedThe converged SOLPS-ITER simulations are post-processed with alternative reaction rates, resulting in considerable contributions of D + 2 to particle and power losses as well as dissociation below the D 2 dissociation area. Those findings are in quantitative agreement with the experimental results.

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Section: Experimental Results On Tcvmentioning

confidence: 99%

Section: Ion Flow Into Outer Divertor Legmentioning

confidence: 99%

A study of the influence of plasma–molecule interactions on particle balance during detachment

Verhaegh

Lipschultz

Harrison

et al. 2021

Nuclear Materials and Energy

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show abstract

“…These ions can result in Molecular Activated Recombination (MAR) or Ionisation (MAI), which act as further ion sinks/sources [9,15,26,29,28]. Ultimately, plasma-molecule reactions can form excited hydrogen atoms, which emit atomic line emission [30,31] and thus serve as an additional plasma energy loss. The impact of such effects is difficult to study directly but may be extremely important in determining the divertor plasma characteristics.…”

Section: Plasma Detachment Investigations Using Spectroscopymentioning

confidence: 99%

“…The first observation drawn from figure 3 is that the profile for each relevant ion source/sink (first row of figure 3) and its evolution is very similar to the corresponding hydrogenic radiative loss (second row). A second observation is that MAR attributed to As D − preferentially populates the n = 3 excited level [31,30,49], the BaSPMI technique estimates the D − contribution from the ratio of the molecular contribution of D β to the molecular contribution of D α . To gain more insight into the experimental evidence for the presence of D − , we performed an alternative analysis using only D α , D γ , D δ measurements whilst assuming that all plasma-molecule interaction related emission arises from D + 2 (Appendix D).…”

Section: Power and Particle Balance With Plasma-molecule Interactions During A Density Rampmentioning

confidence: 99%

The role of plasma-molecule interactions on power and particle balance during detachment on the TCV tokamak

et al. 2021

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This paper shows experimental results from the TCV tokamak that indicate plasma-molecule interactions involving D + 2 and possibly D − play an important role as sinks of energy (through hydrogenic radiation as well as dissociation) and particles during divertor detachment if low target temperatures (< 3 eV) are achieved. Both molecular activated recombination (MAR) and ion source reduction due to a power limitation effect are shown to be important in reducing the ion target flux during a density ramp. In contrast, the electron-ion recombination (EIR) ion sink is too small to play an important role in reducing the ion target flux. MAR or EIR do not occur during N 2 seeding induced detachment as the target temperatures are not sufficiently low.The impact of D + 2 is shown to be underestimated in present (vibrationally unresolved) SOLPS-ITER simulations, which could result from an underestimated D 2 + D + → D + 2 + D rate. The converged SOLPS-ITER simulations are post-processed with alternative reaction rates, resulting in considerable contributions of D + 2 to particle and power losses as well as dissociation below the D 2 dissociation area. Those findings are in quantitative agreement with the experimental results.

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“…Measurements of PS-ESS plasma parameters by OES have been also performed. The electron density n e , the electron temperature T e , and the neutral relative abundances N H =N H 2 (N H and N H 2 being the density of atomic hydrogen H and molecular hydrogen H 2 , respectively) have been estimated by comparing the differences between experimental and theoretical line ratios (Yacora package [25]) of Balmer lines and the Fulcher band for any operative configuration. The statistical error in the minimization procedure allows one to evaluate the plasma parameter error (see Ref.…”

Section: Introductionmentioning

confidence: 99%

Semiempirical zero-dimensional approach for the estimation of beam features from plasma parameters in proton sources

Castro

2020

Phys. Rev. Accel. Beams

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Beam intensity, proton fraction, and beam emittance represent the most important characteristics of a beam extracted by a proton source. Beam parameters are strongly related to the parameters of the plasma from which the beam is extracted. The recent improvement of plasma diagnostics devoted to compact ion sources, and, in particular, the development of optical emission spectroscopy, allows an ever more reliable measurement of plasma parameters, also during source operations. In this paper, a zero-dimensional approach able to estimate the beam intensity and the ion fraction from plasma parameters in a proton source is introduced. The model is based on a simplified solution of the balance equation system in a hydrogen plasma achieved by including the electron density, the electron temperature, and the relative neutral abundance ratio H=H 2 within the equations. This approach permits one to reduce the balance equation system to four equations in four unknowns, namely, the H þ , H þ 2 , and H þ 3 density and the confinement time. The balance equation system is solved by means of a homemade numerical code. The model has been applied to the beam generated by the Proton Source for the European Spallation Source (PS-ESS), during its commissioning at Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud in Catania. The extracted current and ion fraction estimated by this approach have been compared with the experimental results obtained by the PS-ESS beam diagnostics. The proton confinement time estimated by this approach has been compared with the results of a theoretical model based on a diffusion model. The comparison demonstrates that the model has achieved a surprising capability of estimation. The paper discusses the main characteristics of the zero-dimensional approach together with its main advantages and limits. The perspectives for further improvement of the model are also discussed.

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Yacora on the Web: Online collisional radiative models for plasmas containing H, H2 or He

Cited by 35 publications

References 59 publications

A study of the influence of plasma–molecule interactions on particle balance during detachment

A study of the influence of plasma–molecule interactions on particle balance during detachment

The role of plasma-molecule interactions on power and particle balance during detachment on the TCV tokamak

Semiempirical zero-dimensional approach for the estimation of beam features from plasma parameters in proton sources

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