DPG Phi
Verhandlungen
Verhandlungen
DPG

Aachen PK 2003 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

P: Plasmaphysik

P 8: Magnetic Confinement

P 8.5: Talk

Tuesday, March 18, 2003, 16:50–17:10, FO2

E × B Velocity Measurements from Doppler Reflectometry — •Jasmine Schirmer, G.D. Conway, W. Suttrop, S. Klenge, H. Zohm, and ASDEX Upgrade Team — Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching

Doppler reflectometry is a powerful non-invasive measurement technique for studying plasma density fluctuations (i.e. turbulence) with high temporal and spatial resolution. This diagnostic, akin to Radar, works by reflecting a microwave beam off the plasma at a finite tilt angle. The tilt induces a Doppler shift in the returning microwave beam from which the perpendicular propagation velocity (v) of the perturbations is obtained. By varying the tilt angle, different plasma density fluctuation wavelengths are selected and thus a spectrum of the turbulence is measured. The perturbation amplitude can also be obtained from the signal intensity. A radial profile of v is measured by varying the microwave launch frequency. Generally v is dominated by the E × B velocity (i.e. the intrinsic perturbation phase velocity is small) and hence the radial electric field (Er) profile can be obtained. vE × B profile measurements will be presented from various plasma confinement scenarios, such as L-mode and H-mode, with forward and reversed magnetic fields.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2003 > Aachen PK