National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
U-probe for the COMPASS Tokamak
Kovařík, Karel ; Ďuran, Ivan ; Stöckel, Jan ; Seidl, Jakub ; Šesták, David ; Brotánková, J. ; Spolaore, M. ; Martines, E. ; Vianello, N. ; Hidalgo, C. ; Pedrosa, M. A.
A complex electrostatic-magnetic probe diagnostics, baptized as 'U-probe', is being prepared for measurement of properties of the filamentary structures in the edge plasmas of COMPASS tokamak. Probe will be composed of two identical towers. Each tower will house 3 sets of 3D coils, balanced triple probe and six single Langmuir probes each. The design of the probe is based on that of U-probe used on reversed field pinch RFX-mod and our combined electromagnetic probe at TJ-II stellarator. This new COMPASS diagnostic will measure vorticity and longitudial electric current of the plasma filaments. Analysis of the properties and, particularly, the correlation between filament vorticity and its current is expected to shed light into physics of filamentary structures in the tokamak plasma edge. The simulation of the probe surface temperature evolution as a function of expected incident heat loads within the COMPASS edge plasmas is presented.
Measurements of Ion Temperature in the Edge Plasma of the COMPASS Tokamak
Naydenkova, Diana ; Janky, Filip ; Weinzettl, Vladimír ; Stöckel, Jan ; Šesták, David ; Odstrčil, T. ; Ghosh, J. ; Gomes, R. ; Pereira, T.
The two-grating spectrometer, which has been developed for the ISTTOK tokamak, allows an estimation of the temporal evolution of both ion temperature and poloidal velocity of the edge plasma by analysis of Doppler-shifted and broadened CIII spectral lines at ~465nm. At the current phase of the COMPASS tokamak operation, the first measurements of ion temperature using the optical system based on the spectrometer were performed and first results are presented.
Detailní měření poloidální rychlosti fluktuací hustoty a plovoucího potenciálu v okrajovém plazmatu tokamaku CASTOR
Brotánková, Jana ; Stöckel, Jan ; Hron, Martin ; Ďuran, Ivan ; Horáček, Jan
The ion saturation current and floating potential are measured with high temporal (1 micro s) and spatial (2.5 mm) resolutions within the edge plasma of CASTOR tokamak by two poloidally spaced radial arrays of Langmuir probes. The radial electric field and the phase velocity of plasma fluctuations are determined. It is found that radial profiles of both of these quantities are strongly sheared in the proximity of the last closed flux surface. In the proximity of the VSL, the shearing rate is higher than the characteristic frequency of plasma fluctuation and reduction of fluctuation level is observed.
Sborník příspěvků 8. workshopu Elektrická pole, struktury a relaxace v okrajovém plazmatu

Proceedings of the 8th Workshop Electric Fields, Structures and Relaxation in Edge Plasmas

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