The search for a flux-expansion divertor in TJ-II
- Laboratorio Nacional de Fusion-Asociacion Euratom/Ciemat, 28040-Madrid (Spain)
- BIFI: Instituto de Biocomputacion y Fisica de Sistemas Complejos, 50009-Zaragoza (Spain)
The role of the divertor in a stellarator-based fusion reactor is discussed, making emphasis on the flux-expansion concept. In this context, the possibility of having a flux-expansion divertor in TJ-II is explored. As a first step, the three-dimensional map of the particle flux has been estimated using the code ISDEP in two different plasma regimes. This full-f Monte Carlo code computes the ion guiding-centre trajectories. The particle trajectories rather than the field lines must be considered due to the fact that the typical ion orbits are pretty wide in comparison with the typical plasma lengths. Moreover the plasma electric field and the collisionality must be considered. We have chosen a configuration that presents flux expansion at given toroidal positions. We have estimated the three-dimensional map of heat and particle fluxes and checked that it is possible to reduce them strongly by intersecting the trajectories at a given zone of the space. Future studies will include the development of ergodic zones to reduce the fluxes on the divertor plates.
- OSTI ID:
- 21251769
- Journal Information:
- AIP Conference Proceedings, Vol. 1071, Issue 1; Conference: BIFI2008: International conference on large scale simulations of complex systems, condensed matter and fusion plasma, Zaragoza (Spain), 6-8 Feb 2008; Other Information: DOI: 10.1063/1.3033358; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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