Deuterium pellets are injected into an initially pure hydrogen H-mode plasma in order to control the hydrogen: deuterium (H:D) isotope mixture. The pellets are deposited in the outer 20% of the minor radius, similar to that expected in ITER, creating transiently hollow electron density profiles. A H: D isotope mixture of approximately 45%:55% is obtained in the core with a pellet fuelling throughput of Phi(pel) = 0.045P(aux)/T-e,T-ped similar to previous pellet fuelling experiments in pure deuterium. Evolution of the H: D mix in the core is reproduced using a simple model, although deuterium transport could be higher at the beginning of the pellet train compared with the flat-top phase.
Control of the hydrogen:deuterium isotope mixture using pellets in JET
Alessi E;Bonfiglio D;Brombin M;Brunetti D;Carraro L;Causa F;Figini L;Gervasini G;Ghezzi F;Innocente P;Laguardia L;Lazzaro E;Manduchi G;Marchetto C;Mariani A;Murari A;Muraro A;Nowak S;Paccagnella R;Pasqualotto R;Pomaro N;Predebon I;Puiatti M E;Rebai M;Ricci D;Rigamonti D;Schmuck S;Sozzi C;Tardocchi M;Terranova D;Uccello A;Vianello N;
2019
Abstract
Deuterium pellets are injected into an initially pure hydrogen H-mode plasma in order to control the hydrogen: deuterium (H:D) isotope mixture. The pellets are deposited in the outer 20% of the minor radius, similar to that expected in ITER, creating transiently hollow electron density profiles. A H: D isotope mixture of approximately 45%:55% is obtained in the core with a pellet fuelling throughput of Phi(pel) = 0.045P(aux)/T-e,T-ped similar to previous pellet fuelling experiments in pure deuterium. Evolution of the H: D mix in the core is reproduced using a simple model, although deuterium transport could be higher at the beginning of the pellet train compared with the flat-top phase.| File | Dimensione | Formato | |
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prod_431539-doc_154320.pdf
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Descrizione: Control of the hydrogen deuterium isotope mixture using pellets in JET
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