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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Studies of plasma disruptions in the COMPASS tokamak
 Matveeva, Ekaterina ; Tichý, Milan (advisor) ; Van Oost, Guido (referee) ; Gerasimov, Sergei (referee)
Title: Studies of plasma disruptions in the COMPASS tokamak Author: Ekaterina Matveeva Department: Department of Surface and Plasma Physics Supervisor: RNDr. Milan Tich'y, Dr.Sc., Univerzita Karlova, Katedra fyziky povrch˚u a plazmatu Abstract: Plasma disruption in a tokamak is an important physical phenomenon, when there is a sudden loss of plasma confinement and rapid drop of plasma current. During the disruptions, there is significant mechanical stress on the construc- tional structures of the tokamak and thermal stress on the first wall. Allowable number of disruptions with the maximum plasma parameters in the ITER toka- mak (international thermonuclear experimental reactor under construction) will be very limited. Therefore, investigation of disruptions and their consequences is a key problem for sustainable operation of tokamak devices. The thesis focuses on studies of current quench phase and related currents flow- ing in the vacuum vessel at the COMPASS tokamak. An extensive disruption database was collected and critical disruptions' parameters were determined. Plasma current was measured at 5 toroidal position as a consequence of data acquisition system improvement that allowed reliable measurements by magnetic coils without analogue integrators. Special divertor tiles were installed in or- der to...
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