Spectral measurements of runaway electrons by a scanning probe in the TEXTOR tokamak

Kudyakov, T.; Finken, K. H.; Jakubowski, M.; Lehnen, M.; Xu, Y.; Willi, O.
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F126
Academic Journal
Energy spectral measurements of runaway electrons were performed by a scanning probe with high spatial and temporal resolution in the TEXTOR tokamak. The probe consists of ten YSO (Y2SiO5:Ce) crystals, which are shielded by tungsten filters. The probe can resolve electrons with different energies between 4 and 30 MeV. An insertion of the probe to the plasma boundary several times during the discharge allowed spectral measurements of runaway electrons at different minor radial positions at the plasma edge as well as the study of runaway production in time. The high temporal resolution of the probe, 0.05 ms, enabled measurements of runaway electrons not only during low density discharges, but also during plasma disruptions.


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