Toroidally asymmetric distributions of hydrocarbon (CD) emission and chemical sputtering sources in DIII-D

Groth, M.; Brooks, N.H.; Fenstermacher, M.E.; Lasnier, C.J.; McLean, A.G.; Watkins, J. G.

doi:10.1016/j.jnucmat.2007.01.073

Cited by 3 publications

(1 citation statement)

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“…On the other hand, in the Ref. [15], at plasma density of 1 × 10 20 m −3 and the residence time of neutral molecules of infinity (τ neutrals = ∞), there is a good agreement with the calculated D/XB values up to 30 eV in the case of τ ions = 1 × 10 −6 s. In comparison with the D/XB values observed in different fusion devices, the effective D/XB values for the temperature over 20 eV are in good agreement with experimentally determined values (DIII-D [16], JET [6,17], TEXTOR [13]). For the low temperature region less than 20 eV, in the case of plasma densities of 10 19 and 10 20 m −3 , the effective D/XB values are greater than experimental values by a factor of ∼ 2 [18].…”

Section: Simulation Modelsupporting

confidence: 86%

Calculation of D/XB Values of Hydrocarbon Molecules in Tokamak Edge Plasmas

Kawazome

Ohya

Inai

et al. 2010

Plasma and Fusion Research

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In order to investigate the dependence of effective inverse photon-efficiency D/XB values on the plasma parameters, we have been performed calculations of effective D/XB values by Monte Carlo method. Photon fluxes are converted into particle fluxes with aid of D/XB values. A D/XB value is critical factor in the study of chemical erosion by spectroscopic measurement. In modeled tokamak edge plasma, transfer of hydrocarbon molecules (CH 4 , C 2 H x (x = 2,4,6), C 3 H y (y = 4,6,8)) and CH and C 2 emissions have been simulated. The plasma temperature ranged from 1 eV to 100 eV and the plasma densities are 10 18 m −3 , 10 19 m −3 and 10 20 m −3. In the temperature region of less than 3 eV, the calculated D/XB values increase with decreasing temperature due to decreasing of emission counts. In the high temperature region (≥ 10 eV), the D/XB values increase with a rise in the temperature due to decrease of number of fragment of type CH and C 2 .

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Section: Simulation Modelsupporting

confidence: 86%