TY - JOUR
T1 - Time-dependent analysis of spatially resolved fluctuations observed by microwave scattering on TEXTOR
AU - Jadoul, M.
AU - Waidmann, G.
AU - Vandenplas, P. E.
PY - 1998
Y1 - 1998
N2 - A 2 mm microwave scattering system was used on TEXTOR to observe density microfluctuations with good space and time resolution. In ohmic heating conditions, a turbulent sawtooth precursor was discovered and studied in detail near the q = 1 surface, the large fluctuation spike occurring at the sawtooth crash was precisely located in the mixing region, and it was shown that a turbulence pulse propagates together with the outgoing heat pulse. In sawteeth-free neutral beam injection heating discharges, evidence of a toroidal Doppler effect was collected suggesting short parallel wavelength fluctuations near the magnetic axis. In sawtoothing neutral beam injection discharges, a strong transition of the MHz fluctuation levels during the sawtooth development appears as new evidence of the link between confinement and fluctuations.
AB - A 2 mm microwave scattering system was used on TEXTOR to observe density microfluctuations with good space and time resolution. In ohmic heating conditions, a turbulent sawtooth precursor was discovered and studied in detail near the q = 1 surface, the large fluctuation spike occurring at the sawtooth crash was precisely located in the mixing region, and it was shown that a turbulence pulse propagates together with the outgoing heat pulse. In sawteeth-free neutral beam injection heating discharges, evidence of a toroidal Doppler effect was collected suggesting short parallel wavelength fluctuations near the magnetic axis. In sawtoothing neutral beam injection discharges, a strong transition of the MHz fluctuation levels during the sawtooth development appears as new evidence of the link between confinement and fluctuations.
UR - http://www.scopus.com/inward/record.url?scp=0032024896&partnerID=8YFLogxK
U2 - 10.1088/0741-3335/40/3/004
DO - 10.1088/0741-3335/40/3/004
M3 - Article
AN - SCOPUS:0032024896
SN - 0741-3335
VL - 40
SP - 381
EP - 392
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 3
ER -