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A novel method for trace tritium transport studiesBonheure, Georges ...A new method combining a free-form solution for the neutron emissivity andIn methods on which previous JET publications are based (Stork et al 2005 Nucl. Fusion 45 S181, JET Team (prepared by ... Zastrow) 1999 Nucl. Fusion 39 1891, Zastrow et al 2004 Plasma Phys. Control. Fusion 46 B255, Adams et al 1993 Nucl. Instrum. Methods A 329 277, Jarvis et al 1997 Fusion Eng. Des. 34-35 59,Jarvis et al 1994 Plasma Phys. Control. Fusion 36 219), the 14.07 MeV D-T neutron line integrals measurements were simulated and the transport coefficients varied until good fits were obtained. In this novel approach, direct knowledge of tritium concentration or the fuel ratio n(T)žn(D) is obtained using all available neutron profile information, e. g both 2.45 MeV D-D neutron profiles and 14.07MeV D-T neutron profiles (Bonheure et al 2006 Nucl. Fusion 46 725-40). Tritium particle transport coefficients are then determined using a linear regression from the dynamic response of the tritium concentration n(T)žn(D) profile. theratio method (Bonheure et al 2006 Nucl. Fusion 46 725-40) is applied to theinvestigation of tritium particle transport in JET plasmas. The 2D neutronThe temporal and spatial evolution of tritium particle concentration was studied for a set of JET discharges with tritium gas puffs from the JET trace tritium experiments. Local tritium transport coefficients were derived from the particle flux equation Gamma = -D del n(T) + Vn(T), where D is the particle diffusivity and V the convection velocity. emissivity is calculated using the minimum Fisher regularization method (MFR) (Anton et al 1996 Plasma Phys. Control. Fusion 38 1849, Mlynar et al 2003Tritium transport in the plasma core approaches the neoclassical level in some cases. For the set of plasmas analysed and within the uncertainty, tritium particle confinement follows the ITER IPB98(y, 2) particle scaling confinement. Plasma Phys. Control. Fusion 45 169). This method is being developed and studied alongside other methods at JET. The 2D neutron emissivity was significantly improved compared with the first MFR results by constraining theemissivity along the magnetic flux surfaces. 1D profiles suitable for transport analysis are then obtained by subsequent poloidal integration.Source: Nuclear fusion. - ISSN 0029-5515 (Iss. 8, Vol. 49, 2009, 085025-1-085025-12)Type of material - article, component partPublish date - 2009Language - englishCOBISS.SI-ID - 24676647
Author
Bonheure, Georges |
Lengar, Igor |
Snoj, Luka, 1981- |
Trkov, Andrej
Topics
jedrska fizika |
fizika plazme |
tomografija |
tokamak
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Bonheure, Georges | ![]() |
Lengar, Igor | 19167 |
Snoj, Luka, 1981- | 27819 |
Trkov, Andrej | 08557 |
Source: Personal bibliographies
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