dc space‐charge‐induced frequency up‐shift in a quasioptical gyrotron

Stepwise frequency tuning of a gyrotron backward-wave oscillator

The gyrotron backward-wave oscillator (gyro-BWO) features broadband tunability, but ragged tuning curves are frequently observed experimentally. Accordingly, a Ka-band gyro-BWO experiment with external circuit mismatch was conducted to examine its tuning properties at two reflected strengths: one is slightly mismatched (15 dB reflection) and the other can be categorized as matched (30 dB reflec...

Sliding Mode Control of a Bidirectional Buck/Boost DC-DC Converter with Constant Switching Frequency

In this paper, sliding mode control (SMC) for a bidirectional buck/boost DC-DC converter (BDC) with constant frequency in continuous conduction mode (CCM) is discussed. Since the converter is a high-order converter, the reduced-order sliding manifold is exploited. Because of right-half-plan zero (RHPZ) in the converter’s duty ratio to output voltage transfer function, sliding mode current...

Mode Excitation in a Gyrotron

Gyrotron frequency ECRIS development and the future challenges

Gyrotron frequency amplifier has been used for the production of highly charged ion beams with high performance ECR ion sources (ECRIS) for almost 20 years. The widely used technology of microwave power coupling to the high temperature ECR plasma is still a borrowed design from the fusion machines. ECR ion source technologies and physics are advancing over the years, but the interpretation of h...

High Frequency Integrated DC/DC Converter Digital Control

This work focuses on the power management of electronic circuits that operate with low load currents, in the range of a few hundred mA, with voltage regulated by a DC/DC converter since efficiency requirements don’t allow to consider the application of a linear regulator. Therefore, the use of a buck converter, whose efficiency doesn’t decrease significantly with the decrease of the load curren...