Tesis doctoral de Jeronimo Garcia Olaya
The magnetically confined plasmas study is one of the most promising research fields in the present days due to the high perspectives of unlimited and clean energy that fusion has generated. In this framework, the stellarator devices play a significant role because of, unlike in the tokamak case, their continuum working regime, which will be an essential feature of the future fusion commercial reactor. heat transport studies in stellarator devices are completely necessary since the main plasma properties (and therefore, the total fusion power generated) are absolutely dependent. Nowadays, the largest stellarator in the world is the large helical device (lhd). There is also a stellarator device is spain, tj-ii, which is located in the installations of ciemat in Madrid. In this thesis, turbulent and conductive heat transport is studied in both devices with the aim of comparing its formation and suppression. first of all, collisional transport, i.E. Neoclassical transport, which is caused by the particle collisions, is studied by means of a new transport model implemented in the transport code pretor-stellarator. This model is able to calculate heat diffusivities as well as the neoclassical electric field with reasonable accuracy without spending as much computational time as in the monte carlo techniques. It is deduced from the results that, for both tj-ii and lhd, neoclassical transport may be quite important in plasmas with low density and high temperatures, although higher levels of neoclassical transport are obtained in tj-ii. Both devices share the feature that in low collisional plasmas, a high positive neoclassical electric field with a high shear appears in the plasma core. This electric field can be responsible of the suppression of the turbulence heat transport. some new turbulent heat transport models have been added to pretor-stellarator in order to study this kind of transport. Both, lhd and tj-ii, share a common heat tr
Datos académicos de la tesis doctoral «Study of electron heat transport in lhd and tj-ii«
- Título de la tesis: Study of electron heat transport in lhd and tj-ii
- Autor: Jeronimo Garcia Olaya
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 20/04/2006
Dirección y tribunal
- Director de la tesis
- Javier Dies Llovera
- Tribunal
- Presidente del tribunal: fransesc Fayos vallés
- enrico Di pietro (vocal)
- joaquin Sanchez (vocal)
- Francisco Castejon magaña (vocal)