Sep 20 – 24, 2021
America/Vancouver timezone

Two-Rod-Antenna Microwave Injection System for Production of Circularly Polarized Microwaves in Cylindrical ECRIS Cavities

Not scheduled
Poster Production of high intensity ion beams Poster Session 1


Dr Alexandra Philipp (Dreebit GmbH)


In the design of Electron Cyclotron Resonance Ion Sources (ECRIS) three topics generally need to be addressed: (i) The feed of a microwave to generate a plasma, (ii) the creation of a magnetic field guiding the charged particles, and (iii) the design of an ion extraction system. In this report, we concentrate on improvements of aspect (i), a new microwave injection system introduced to the Dresden ECRIS 2.45M, a permanent-magnet 2.45 GHz ECRIS, applied, e.g., for the production of proton currents in medical particle therapy. The improvements include the replacement of its one-rod antenna system by two rod antennas on one cross-sectional circle of the cylindrical ECRIS cavity positioned under an angle of 90° towards each other. Feeding two microwave signals with a relative phase shift of 90°, a right-hand circularly polarized wave can be created inside the cavity to efficiently heat the electrons. Basic considerations, simulations, and results from first experiments are presented.

E-mail for contact person

Primary author

Dr Alexandra Philipp (Dreebit GmbH)


Erik Ritter (Dreebit GmbH) Mrs Maria Molodtsova (Dreebit GmbH)

Presentation materials