Spatially and temporally resolved measurements of runaway electrons in the TEXTOR tokamak Timur.Kudyakov@uni-duesseldorf.de.

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Presentation transcript:

Spatially and temporally resolved measurements of runaway electrons in the TEXTOR tokamak Timur.Kudyakov@uni-duesseldorf.de Bad Breisig 12.10.07

Thanks to ILPP Universität Düsseldorf T. Toncian and O. Willi Technical staff ILPP Düsseldorf FZ- Jülich K.H. Finken, M. Jakubowski, B. Schweer, Y. Xu A. Hiller

Overview Introduction, experimental set-up Experimental results Outlook

Runaway elektron Accelerating force: Drag force: Runaway electron:

Runaway diagnostics The synchrotron radiation measurements K.H. Finken et. al., Nucl. Fus. 31, 859 (1990). Neutrons detector O.N. Jarvis et.al., Controlled Fusion and Plasma Heating (Proc. 15th Eur.Conf. Dubrovnik, 1988), Vol. 12B, Part I, European Physical Society 334 (1988). B. Esposito et. al., Phys. Plas. 10, 2350 (2003). A new probe measurements

Synchrotron radiation K.H. Finken et. al., Nucl. Fus. 31, 859 (1990).

New probe γ e- e- a = 46 cm e- e- γ e- a = 44 cm Plasma boundary γ 53 cm e- e- a = 46 cm e- e- γ e- 44 cm a = 44 cm Time resolution : 100ns Spatial resolution: 20 mm

Experimental scheme

Probe scan data Measurements of runaway electrons at minor radial positions between 53 cm and 44 cm of the probe.

Runaway electrons measurements in the TEXTOR vessel Discharge 102711; 1-probe position, 2-probe signal, probe position at 44 cm; Discharge 102710; probe signal, probe position at 45 cm; Discharge 102711, neutron measurements; the synchrotron signal measurements inside the plasma between 1.4 m and 1.9 m major radius;

Spectrometer Spectrometer Time resolution : 100ns Spatial resolution: 2 mm

Energy spectrum Minimum electron energy registered by every crystal Electron beam with Gauss distribution, electron temperature 3MeV Geant 4

Conclusion: Runaway electrons were studied in the interior and exterior region of the plasma. Direct measurements of runaway electrons at the plasma boundary was carried out. Population of the runaway electrons exponentially increased up to the plasma edge. Good possibility to study plasma interaction with high Z materials and carbon Outlook: Construction of the new spectrometer to measure runaway electrons spectrum between 3 and 30 MeV. 3D-simulations of the runaway electrons transport through the probe (Geant 4). Cross calibration of the probe by means of the new Amplitude laser system.

Thank you!