Abstract
CAST is a data taking axion helioscope using a recycled LHC test magnet, CERN’s detector technology and cryogenics expertise. An imaging X‐ray telescope improves substantially the detection sensitivity and axion‐ID. Massive axion‐like particles of the Kaluza‐Klein type were first introduced to explain the paradox of the hot corona, which is even hotter at locations overlying magnetic spots. This is suggesting that the CAST detection principle might be at work there, but being somehow modified and performing better. Remarkably, the density profile of the Sun allows for resonance crossing (maxionc2≈ħωplasma), which axion helioscopes are aiming to reach. The restless Sun favours this occasionally even further. Then, such processes can give rise to a chimera of converted axions or the like, making the Sun appear, within known physics, as mysterious and unpredictable as it is. CAST axion limits were used to conclude also for the hidden sector paraphotons. This is then suggestive for novel helioscopes for exotica like paraphotons, chameleons, etc. Pierre Sikivie’s pioneering idea was to use a magnetic field as a catalyst to transform particles from the dark sector to ours, and vice versa.
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