Artículo
Real-time control of divertor detachment in H-mode with impurity seeding using Langmuir probe feedback in JET-ITER-like wall
Autor/es | Guillemaut, C.
Lennholm, M. Harrison, J. Carvalho, I. Valcarcel, D. Jet Contributors García Muñoz, Manuel |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2017-04 |
Fecha de depósito | 2020-08-27 |
Publicado en |
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Resumen | Burning plasmas with 500 MW of fusion power on ITER will rely on partially detached divertor
operation to keep target heat loads at manageable levels. Such divertor regimes will be
maintained by a real-time control system ... Burning plasmas with 500 MW of fusion power on ITER will rely on partially detached divertor operation to keep target heat loads at manageable levels. Such divertor regimes will be maintained by a real-time control system using the seeding of radiative impurities like nitrogen (N), neon or argon as actuator and one or more diagnostic signals as sensors. Recently, real-time control of divertor detachment has been successfully achieved in Type I ELMy H-mode JETITER-like wall discharges by using saturation current (Isat) measurements from divertor Langmuir probes as feedback signals to control the level of N seeding. The degree of divertor detachment is calculated in real-time by comparing the outer target peak Isat measurements to the peak Isat value at the roll-over in order to control the opening of the N injection valve. Real-time control of detachment has been achieved in both fixed and swept strike point experiments. The system has been progressively improved and can now automatically drive the divertor conditions from attached through high recycling and roll-over down to a user-defined level of detachment. Such a demonstration is a successful proof of principle in the context of future operation on ITER which will be extensively equipped with divertor target probes. |
Cita | Guillemaut, C., Lennholm, M., Harrison, J., Carvalho, I., Valcarcel, D., Jet Contributors, y García Muñoz, M. (2017). Real-time control of divertor detachment in H-mode with impurity seeding using Langmuir probe feedback in JET-ITER-like wall. Plasma Physics and Controlled Fusion, 59 (4), 1-16. |
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