title: An improved coupling design for high-frequency TE011 electron paramagnetic resonance cavities.
abstract: In high-frequency electron paramagnetic resonance (EPR) spectroscopy the sample is usually accommodated in a single-mode cylindrical TE(011) microwave cavity. This cavity stands out in terms of flexibility for various types of EPR experiments due to convenient control of its resonance frequency and easy waveguide-to-cavity microwave coupling. In continuous wave and in pulsed EPR it is, however, essential to be able to vary the coupling efficiency over a large range. We present a new mechanical design to vary the microwave coupling to the cavity using a movable metal sphere. This coupling sphere is shifted in the plane of the iris wall inside the coupling waveguide. The design allows for a compact and robust construction of the EPR probehead that can be easily accommodated inside a limited space of helium flow cryostat. The construction details and characterization of the coupling element for 95 GHz (W-band) EPR as well as for 34 GHz (Q-band) are presented.
authors: Max-Planck-Institut für chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany. anton.savitsky@cec.mpg.de
authors: A
authors: A
authors: Savitsky
authors: Yu
authors: Y
authors: Grishin
authors: R
authors: R
authors: Rakhmatullin
authors: E
authors: E
authors: Reijerse
authors: W
authors: W
authors: Lubitz