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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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Study of Equilibrium Magnetic Configuration in Tokamak Type Devices
Havlíček, Josef ; Tichý, Milan (advisor) ; Kubeš, Pavel (referee) ; Van Oost, Guido (referee)
This thesis presents the magnetic fields of the COMPASS tokamak and work done during the COMPASS reinstallation in the Czech Republic. The geometry, vacuum magnetic fields and Power Supplies for the poloidal field coils circuits are described in the technical part of the thesis. The design of Power Supplies filters and improvements in the controller algorithm are also introduced. The MHD equilibrium reconstruction code EFIT++ and implementation of the induced currents model are described in the physical part of the thesis. The EFIT++ code was adapted for COMPASS. The utilization of the EFIT++ code for the COMPASS operation is shown. The global power balance in the non-stationary phases of the tokamak discharge is explained and examples are shown. The attached articles describe Power Supplies and tokamak feedback system developed for the COMPASS plasma control. Powered by TCPDF (www.tcpdf.org)
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Study of Equilibrium Magnetic Configuration in Tokamak Type Devices
Havlíček, Josef ; Tichý, Milan (advisor) ; Kubeš, Pavel (referee) ; Van Oost, Guido (referee)
This thesis presents the magnetic fields of the COMPASS tokamak and work done during the COMPASS reinstallation in the Czech Republic. The geometry, vacuum magnetic fields and Power Supplies for the poloidal field coils circuits are described in the technical part of the thesis. The design of Power Supplies filters and improvements in the controller algorithm are also introduced. The MHD equilibrium reconstruction code EFIT++ and implementation of the induced currents model are described in the physical part of the thesis. The EFIT++ code was adapted for COMPASS. The utilization of the EFIT++ code for the COMPASS operation is shown. The global power balance in the non-stationary phases of the tokamak discharge is explained and examples are shown. The attached articles describe Power Supplies and tokamak feedback system developed for the COMPASS plasma control. Powered by TCPDF (www.tcpdf.org)
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