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Study of Wall Conditioning plasmas and their efficiency for Tritium removal in ITER
 
IRFM
Mercredi 31/05/2017, 14h30-15h30
Amphi du Château de Cadarache, CEA Cadarache

In common with present-day tokamaks, ITER will require wall conditioning systems and strategies for successful operation from the point of view of plasma-facing surface preparation. Unlike today’s devices however, ITER will have to manage large quantities of Tritium fuel, imposing on wall conditioning a major responsibility for Tritium inventory control.

ITER is currently envisioning several wall conditioning techniques for Tritium removal from the vacuum vessel. In addition to baking, wall conditioning discharges, in particular Glow Discharge Conditioning (GDC) or Ion Cyclotron Wall Conditioning (ICWC), will be mandatory to control the Tritium inventory. Isotopic exchange with GDC and ICWC, where Tritium is substituted by Deuterium in Beryllium co-deposited layers or in the subsurface layer of Plasma Facing Components, are possible options for the control of the Tritium inventory build-up in ITER.

A study of wall conditioning plasmas and their interaction with wall surfaces in tokamaks therefore naturally appears twofold. Knowledge of the physics involved in discharges is on one hand mandatory and physics and operational aspects of these low temperature plasmas will be firstly discussed. The other facet, the interaction between wall conditioning discharges and inner wall surfaces of tokamaks, will be then presented under the light of experimental and modelling results.

Based on this overview of the state of the art, predictions on the application and the efficiency of these plasmas for the control of the Tritium inventory build-up in ITER will be given, together with a discussion on the identified research areas to be further studied.

 

Composition du jury

G. CARTRY

Aix-Marseille Université

Rapporteur

K. HASSOUNI

Université Paris 13

Examinateur

J.-M. LAYET

Aix-Marseille Université

Examinateur

R. NEU

IPP Garching & Technische Universität München, Germany

Rapporteur

G. VAN OOST

Ghent University, Belgium

Rapporteur

 

 

Contact : EP222307

 

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