Dissertation in the field of Industrial Electronics, Janne Holma
The title of thesis is A Pulse Power Modulator with Extremely Flat-top Output Pulses for the Compact Linear Collider at CERN
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This research has been carried out in the European Laboratory for Particle Physics (CERN) as part of a feasibility study of the Compact Linear Collider (CLIC) accelerator project. A new pulse power modulator has been designed and experimentally verified, in order to generate fast, high-voltage, pulses with extreme flat-top stability for the kicker magnets of the damping rings. The stability of the output waveforms of the pulse power modulators is a crucial parameter for operation of the CLIC accelerator. This dissertation presents the selected topology and design steps for the required pulse power modulator, and various methods to improve the flat-top stability of its output waveforms. Two prototype modulators, inductive adders, were built and the methods to improve the flat-top stability were proved experimentally. The highest flat-top stability achieved with the prototype modulators is approximately 20 times better than that of commercial pulse power modulators and the best reported in the literature for pulse power modulators generating such fast, less than a microsecond long, high-voltage pulses. The relative flat-top stability required for all of the CLIC damping ring kickers, except for the damping ring extraction kickers, was achieved. Nevertheless, the dissertation shows that the requirements for the damping ring extraction kickers are very probably feasible with the methods presented in the dissertation. Improvement of the flat-top stability of pulse power modulators is also useful in many other applications, e.g. in radar systems, industrial X-ray sources, radiotherapy devices and synchrotron light sources. Inductive adder type pulse power modulators are also used in research into laser ignited fusion energy.
Opponent: Dr. Craig P. Burkhart, SLAC National Accelerator Laboratory, Menlo Park, CA, United States
Supervisor: Professor Seppo Ovaska, Aalto University School of Electrical Engineering, Department of Electrical Engineering and Automation
Dissertation website
Contact information:
Janne Holma
tel. +358 50 362 8992
janne.holma@cern.ch