Axion Haloscopes with Toroidal Geometry at CAPP/IBS

TL;DR

This paper discusses the development of toroidal axion haloscopes at CAPP/IBS, which aim to improve axion detection by overcoming limitations of traditional cylindrical designs through larger volume and reduced fringe fields.

Contribution

It introduces the concept of toroidal axion haloscopes and details ongoing research and plans to implement this innovative geometry for axion searches.

Findings

Toroidal design offers larger cavity volume.

Reduced fringe magnetic fields improve detection sensitivity.

Ongoing research demonstrates feasibility of the approach.

Abstract

The present state of the art axion haloscope employs a cylindrical resonant cavity in a solenoidal field. We, the Center for Axion and Precision Physics Research (CAPP) of the Institute for Basic Science (IBS) in Korea, are also pursuing halo axion discovery using this cylindrical geometry. However, the presence of end caps of cavities increases challenges as we explore higher frequency regions for the axion at above 2 GHz. To overcome these challenges we exploit a toroidal design of cavity and magnetic field. A toroidal geometry offers several advantages, two of which are a larger volume for a given space and greatly reduced fringe fields which interfere with our preamps, in particular the planned quantum-based devices. We introduce the concept of toroidal axion haloscopes and present ongoing research activities and plans at CAPP/IBS.