Erosion/redeposition analysis of the ITER first wall with convective and non-convective plasma transport

Brooks, J.N.; Allain, Jean Paul; Rognlien, T. D.

doi:10.1063/1.2401610

Cited by 21 publications

(29 citation statements)

References 23 publications

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“…However tritium will still be codeposited with beryllium. Over each operational day of fifteen 400 s duration plasma pulses a layer up to 6 -12 microns of codeposited tritium with beryllium is projected to accumulate on the ITER baffle (estimated growth rate of order 1-2 nm/s) [24,25]. Strong thermal cycling and mechanical vibrations are expected.…”

Section: Mechanical Stability Of Thick Filmsmentioning

confidence: 99%

Mass changes in NSTX surface layers with Li conditioning as measured by quartz microbalances

Skinner

Kugel

Roquemore

et al. 2009

Journal of Nuclear Materials

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Abstract:Dynamic retention, lithium deposition, and the stability of thick deposited layers were measured by three quartz crystal microbalances (QMB) deployed in plasma shadowed areas at the upper and lower divertor and outboard midplane in the National Spherical Torus Experiment (NSTX).Deposition of 185 µg/cm 2 over 3 months in 2007 was measured by a QMB at the lower divertor while a QMB on the upper divertor, that was shadowed from the evaporator, received an order of magnitude less deposition. During helium glow discharge conditioning both neutral gas collisions and the ionization and subsequent drift of Li + interrupted the lithium deposition on the lower divertor. We present calculations of the relevant mean free paths. Occasionally strong variations in the QMB frequency were observed of thick lithium films suggesting relaxation of mechanical stress and/or flaking or peeling of the deposited layers.

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Section: Mechanical Stability Of Thick Filmsmentioning

confidence: 99%

Mass changes in NSTX surface layers with Li conditioning as measured by quartz microbalances

Skinner

Kugel

Roquemore

et al. 2009

Journal of Nuclear Materials

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“…For the reference edge plasma solution [4,5]-with electron temperature and D-T ion flux at/to the outer divertor shown in Fig. 1-the net and gross erosion of tungsten is found to be negligible.…”

Section: W-mix Codementioning

confidence: 93%

“…This source-as given by Ref. [5] analysis-is time independent. The second term on the rhs of (1)-varying with time due to changes in divertor surface composition-is the incident flux of Be to segment i resulting from sputtering of the divertor, where C out;j Be;S is the sputtered flux from segment 'j' and A S (j, i) is the redeposition matrix element giving the fraction of sputtered flux from segment j that is deposited on segment i.…”

Section: W-mix Codementioning

confidence: 98%

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‘Mixed-material evolution analysis of the ITER divertor’

Brooks

Allain

2009

Journal of Nuclear Materials

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“…SOL convective/blob transport is an active area of research and its effect on the transport of wall sputtered ions is unclear. Three phemonological models that simulate the range of possible physics are described in [22]. Use of emission lines from tungsten ions would minimise these complications, but there is very little atomic data for the lower charge states.…”

Section: +mentioning

confidence: 99%

Atomic physics in the quest for fusion energy and ITER

Skinner

2009

Phys. Scr.

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The urgent quest for new energy sources has led developed countries, representing over half of the world population, to collaborate on demonstrating the scientific and technological feasibility of magnetic fusion through the construction and operation of ITER. Data on high-Z ions will be important in this quest. Tungsten plasma facing components have the necessary low erosion rates and low tritium retention but the high radiative efficiency of tungsten ions leads to stringent restrictions on the concentration of tungsten ions in the burning plasma. The influx of tungsten to the burning plasma will need to be diagnosed, understood and stringently controlled. Expanded knowledge of the atomic physics of neutral and ionized tungsten will be important to monitor impurity influxes and derive tungsten concentrations. Also, inert gases such as argon and xenon will be used to dissipate the heat flux flowing to the divertor. This article will summarize the spectroscopic diagnostics planned for ITER and outline areas where additional data is needed.

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Erosion/redeposition analysis of the ITER first wall with convective and non-convective plasma transport

Cited by 21 publications

References 23 publications

Mass changes in NSTX surface layers with Li conditioning as measured by quartz microbalances

Mass changes in NSTX surface layers with Li conditioning as measured by quartz microbalances

‘Mixed-material evolution analysis of the ITER divertor’

Atomic physics in the quest for fusion energy and ITER

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