CAST: A search for solar axions at CERN

TL;DR

The CAST experiment at CERN uses a powerful magnet and advanced detectors to search for solar axions, aiming to surpass astrophysical limits and potentially discover these particles.

Contribution

This paper introduces the CAST helioscope at CERN, utilizing a decommissioned LHC magnet and innovative detection technology to improve sensitivity in axion searches.

Findings

Projected sensitivity exceeds astrophysical constraints

Low background achieved with advanced optics and detectors

Initial data collection underway since 2002

Abstract

The new axion helioscope at CERN started acquiring data during September of 2002: CAST (Cern Axion Solar Telescope) employs a decommissioned LHC dipole magnet to convert putative solar axions or axion-like particles into detectable photons. The unprecedented dipole magnet intensity and length (9.5 T, 10 m) results in a projected sensitivity that surpasses astrophysical constraints on these particles for the first time, increasing the chance of discovery. The use of X-ray focusing optics and state-of-the-art detector technology has led to an extremely low background for an experiment above ground. A brief status report is given, with emphasis on the tracking and control system and possible future extensions.