▣ Title : Behaviour of Electromagnetic Waves in Different Cavity
Structures
▣ Speaker
: Hyoung Suk Kim (KNU)
▣ Date
& Time : Friday, November 1 (2:00
~ 3:30pm)
▣ Place
: LG Research Building, Room #101
▣ Host
: Prof. Jae Koo Lee (Tel. 2083)
▣ Abstract :
Understanding
electromagnetic wave phenomena is very important to be able to design RF
cavities such as for atmospheric microwave plasma torch, microwave vacuum
oscillator/amplifier, and charged-particle accelerator. This deals with some
electromagnetic wave equations to show applications to develop the analytic
design formula for the cavity. For the initial and crude design parameter,
equivalent circuit approximation of radial line cavity has been used. The
properties of resonator, resonant frequency, quality factor, and the
parallel-electrodes gap distance have been considered as design parameters. The
rectangular cavity is introduced for atmospheric microwave plasma torch as a
rectangular example, which has uniform electromagnetic wave distribution to
produce wide area plasma in atmospheric pressure environment. The annular
cavity for klystrodeis introduced for a microwave vacuum oscillator as a circular example, which
adapted the grid structure and the electron beam as an annular shape which
gives high efficiency compared with conventional klystrode.
Simulation results using the commercial softwaressuch as HFSS and MAGIC are also introduced for the comparison with the
analytical results. Various fabrication technologies on a cavity are also shown
in addition.
