Measurements of density profile and density fluctuations in Tore Supra with reflectometry
Tore-Supra is now running with a set of reflectometers using three different techniques. A 50-110 GHz X-mode fast and continuously scanning frequency set-up that routinely measures the density profile, a stepped fixed frequency X-mode set-up operating between 105�160 GHz for plasma core measurements which is also able to perform slow sweeps and a 50-75 GHz O-mode Doppler reflectometer with k-spectra determination. This collection of diagnostics can thus achieve complementary measurements from the low to the high field side of the discharge. Reflectometers provide reliable and accurate measurements of the density profile from the edge to the center even during large and fast profile evolution. Central MHD modes are observed with high radial and temporal resolution. Thus, valuable information can be given onto the safety factor profile to be compared with equilibrium code calculations. Detecting MHD modes with two reflectometers at different toroidal location allows to estimate the mode toroidal velocity. The fluctuation poloidal velocity is measured with Doppler reflectometry. The radial profile of small scale density fluctuations can be retrieved from fast FM-CW phase reflected signal. It shows a minimal level in the center, and a strong increase toward the edge.
Bibliographic Reference: An oral paper given at: 20th IAEA Fusion Energy Conference Organised by: International Atomic Energy Agency Held at: Centrtro de Fusao Nuclear, Vilamoura (PT)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: firstname.lastname@example.org
Record Number: 200518002 / Last updated on: 2005-03-15
Original language: en
Available languages: en