Journal
PLASMA PHYSICS AND CONTROLLED FUSION
Volume 63, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6587/abf03e
Keywords
plasma; tokamak; detachment; nitrogen; divertor; heat flux
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Funding
- MEYS project COMPASS RI [CZ.02.1. 01/0.0/0.0/16_013/0001551]
- European structural and investment funds
- Euroatom research and training programme 2014-2018 [633053]
- Euroatom research and training programme 2019-2020 [633053]
- MEYS project [LM2018117]
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The paper introduces a real-time feedback system based on impurity seeding for reducing heat flux onto the divertor in future thermonuclear reactors. Experiments conducted in the COMPASS tokamak confirm the system's effectiveness in controlling divertor heat fluxes and suggest potential application in next-step devices.
The reduction of the incident heat flux onto the divertor will be a necessity for the future thermonuclear reactors. Impurity seeding is recognized as an efficient way to achieve the partial detachment regime, which allows to dissipate a large fraction of power flux by radiation. This paper presents a heat flux real-time feedback system (RTFS) based on impurity seeding controlled by a combined ball-pen and Langmuir probe divertor array in the COMPASS tokamak. A number of features of the system have been studied, such as the type of impurity, seeding location, constants used in the real-time controller and the diagnostic selections. A detailed description of the designed RTFS and the results of the implementation are presented. The findings confirm the applicability of the RTFS for reduction and control of the divertor heat fluxes. Another important implication of this research is the ability of installing such systems in next-step devices.
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