Atomic and molecular database for fusion plasma edge studies

Janev, R.K.; Harrison, Mark; Drawin, H. W.

doi:10.1088/0029-5515/29/1/015

Cited by 92 publications

(75 citation statements)

References 73 publications

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“…4(c) shows similar q k until SFD detachment onset, suggesting that perpendicular energy losses are not principally different in the SFD, despite increased L C (which could enable such given to dissociation products due to a dissociation threshold energy that is higher than the bond energy itself. See, e.g., [33]. 5 The best fit is determined by matching the peak values of measured heat flux and…”

Section: Modeling Results and Discussionmentioning

confidence: 99%

Modeling detachment physics in the NSTX snowflake divertor

Meier

Soukhanovskii

Bell

et al. 2015

Journal of Nuclear Materials

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a b s t r a c tThe snowflake divertor is a proposed technique for coping with the tokamak power exhaust problem in next-step experiments and eventually reactors, where extreme power fluxes to material surfaces represent a leading technological and physics challenge. In lithium-conditioned National Spherical Torus Experiment (NSTX) discharges, application of the snowflake divertor typically induced partial outer divertor detachment and severalfold heat flux reduction. UEDGE is used to analyze and compare conventional and snowflake divertor configurations in NSTX. Matching experimental upstream profiles and divertor measurements in the snowflake requires target recycling of 0.97 vs. 0.91 in the conventional case, implying partial saturation of the lithium-based pumping mechanism. Density scans are performed to analyze the mechanisms that facilitate detachment in the snowflake, revealing that increased divertor volume provides most of the parallel heat flux reduction. Also, neutral gas power loss is magnified by the increased wetted area in the snowflake, and plays a key role in generating volumetric recombination.

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Section: Modeling Results and Discussionmentioning

confidence: 99%

Modeling detachment physics in the NSTX snowflake divertor

Meier

Soukhanovskii

Bell

et al. 2015

Journal of Nuclear Materials

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“…Recent work by Busnengo et al (1996) supports the cross section estimates in the higher-energy region typical of the JET primary beam energies. For ion impact excitation from H(n = 1) to H(n = 2) by H + and the light ion bare nuclei, recent work (Janev and Krystic 1992, Ermolaev 1990, Fritsch and Lin 1991, Toshima and Tawara 1995 together with the appraisal by Janev and Smith (1993) indicated only modest adjustments to the JET89 data of at most 10%. For the key excitations from H(n = 1) to H(n = 3), adjustments by at most 15% over the whole energy range were required, except for H + impact at energies below 10 4 eV/amu where the new JET99 data follows Janev and Smith.…”

Section: Fundamental Atomic Datamentioning

confidence: 99%

Neutral beam stopping and emission in fusion plasmas I: deuterium beams

Anderson

Hellermann

Hoekstra

et al. 2000

Plasma Phys. Control. Fusion

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Abstract. The charge transfer reaction of neutral deuterium beams with impurities enables one of the principle quantitative diagnostic measurements of the hot core fusion plasma; that is, charge exchange spectroscopy. The complementary measurement of beam emission spectroscopy has been fruitful in motional Stark wavelength shift and fluctuation studies, but less so in using absolute measured intensities. In the last two years we have achieved substantial improvement in the quantitative analysis and agreement between the observed and modelled beam emission at the JET Joint Undertaking. This has depended on improved spectral fitting of the overlayed D α motional Stark multiplet, self-consistent beam emission and impurity charge exchange modelling and analysis, and revision of the data entering the modelling of the beam emission process. The paper outlines the present JET beam emission diagnostic system and the collisional radiative modelling of deuterium beam stopping and emission. The nature and organization of the effective derived data directly used in experimental interpretation at JET are described and some results of spectral analysis of deuterium beam emission given. The practical implementation of the methods described here is part of the ADAS Project.

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“…The cross sections for all collisional processes were taken from Ref. 12 and averaged over the relative velocities of the beam and plasma particles. The radiative rates for n ഛ 6 were taken from the NIST database 13 and hydrogenic approximation was assumed for transitions higher than n ഛ 50. for the n =3→ n = 2 transition, also measured in tokamak plasmas, 3 is determined as BE = N 3 A 32 / N b / V b .…”

Section: Calculation Of Beam-stopping Cross Sectionsmentioning

confidence: 99%

Review of atomic data needs for active charge-exchange spectroscopy on ITER

Marchuk

Bertschinger

Biel

et al. 2008

Review of Scientific Instruments

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The quantitative exploitation of active beam spectra is largely based on an advanced atomic modeling. Under the ITER operating conditions the penetration depth of a diagnostic beam into the plasma core crucially affects the intensities of spectral lines and hence the uncertainties of derived plasma parameters. A critical review of atomic data and an assessment of its error margins are, therefore, urgently needed. The aim of the present work is to verify the existing beam-stopping and beam-emission data for hydrogen beam in fusion plasmas. The agreement between the ADAS database and the present calculations is found to be within 5% for the beam-stopping data in a H-plasma. The calculation of beam attenuation in the presence of He-ash ͑4%͒ and Be ions ͑2%͒ demonstrates the agreement between the present data and the ADAS database within 10%. Finally, the maximum deviation of 15% is found only for beam-emission data at the electron density of 1 ϫ 10 12 -2ϫ 10 12 cm −3 , which is significantly below the ITER density of 10 14 cm −3 .

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Atomic and molecular database for fusion plasma edge studies

Cited by 92 publications

References 73 publications

Modeling detachment physics in the NSTX snowflake divertor

Modeling detachment physics in the NSTX snowflake divertor

Neutral beam stopping and emission in fusion plasmas I: deuterium beams

Review of atomic data needs for active charge-exchange spectroscopy on ITER

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