Publication: Runaway electron generation and control
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2017-01-01
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Abstract
We present an overview of FTU experiments on runaway electron (RE) generation and control carried out through a comprehensive set of real-time (RT) diagnostics/control systems and newly installed RE diagnostics. An RE imaging spectrometer system detects visible and infrared synchrotron radiation. A Cherenkov probe measures RE escaping the plasma. A gamma camera provides hard x-ray radial profiles from RE bremsstrahlung interactions in the plasma. Experiments on the onset and suppression of RE show that the threshold electric field for RE generation is larger than that expected according to a purely collisional theory, but consistent with an increase due to synchrotron radiation losses. This might imply a lower density to be targeted with massive gas injection for RE suppression in ITER. Experiments on active control of disruption-generated RE have been performed through feedback on poloidal coils by implementing an RT boundary-reconstruction algorithm evaluated on magnetic moments.
Description
Special issue featuring the invited talks from the 43rd EPS Conference on Plasma Physics, Leuven, 4-8 July, 2016
Keywords
Tokamaks, Tokamak FTU, FTU, Frascati Tokamak Upgrade, Runaway electrons, Runaway Electron Imaging and Spectrometry System, REIS, Synchrotron radiation
Bibliographic citation
Plasma Physics and Controlled Fusion, (2017), 59(1), 014044, [12] p.