Browsing by Author "Serra, F."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Changes in the density profile due to the m=2 tearing mode in asdexPublication . Manso, M.E.; Silva, A.; Serra, F.; Matias, José; Mendonça, J.; Zohm, H.; Kluber, O.; Soldner, F.X.Resistive MHO tearing modes can develop magnetic islands near the rational magnetic surfaces, where q=m/ n.
- Localized density measurements on ASDEX using microwave reflectometryPublication . Manso, M.E.; Serra, F.; Silva, A.; Matias, José; Nunes, F.; Leitão, J.; Mata, J.; Varela, P.; Vergamota, S.; Neves, J.; Pereira, J.; Cupido, L.; Soldner, F.X.; Siller, G.Reflectometry is based on the propagation and reflection of probing waves in the inhomogeneous fusion plasma.
- Reflectometry measurements of the m=1 satellite mode in L- and H-mode plamas in ASDEXPublication . Serra, F.; Manso, M.E.; Silva, A.; Matias, José; Wagner, F.; Zohm, H.; Kallenbach, A.; Varela, P.In ASDEX, with strong NB, heating, often a large central m=1, n=1 mode is observed on the SXR emission. For PNBI > 1 MW a mode rotating with the same frequency, the so-called`m=1 satellite`, is seen on the magnetic pick-up coils in the L and H-phases. Magnetic measurement s in the divertor chamber suggest that the satellite mode might be located outside the separatix, on open field lines reaching the diretor /1/. Here we present results from localized microave reflectrometric measurements. The time evolution of the satellite mode frequency is studied for plasmas with different qa and the mode localization is estimated, confirming that is shoud be close to but outside the separatrix. The central toroidal rotation velocities of the plasma can be inferred from the measured frenquencies of the satellite modes.