An experiment at CERN has failed to find axions coming from the galactic halo, but it is getting closer by AndyTomaswick
CAST is basically a giant metal tube with a very strong magnet known as a helioscope and various kinds of light detectors inside of it. It was initially designed to look at axions that could be coming from our own Sun. So far, it has failed to find any, but the scientists working on the experiment came up with a slight modification that allowed them to take a look at even more data.
Their modifications resulted in the magnet being capable of detecting axions that would have developed in the dark matter halo that surrounds the Milky Way. This is another possible source of axions, but one that other experiments hadn’t yet explored. The next experiment, dubbed an axion haloscope, or CAST-CAPP, started collecting data in September 2019.
Unfortunately, even after that, there were still no signs of axions. But, as stated at the beginning of the article, even a lack of evidence for something can help move science forward. Researchers can now definitively narrow down the maximum potential strength of an axion’s interaction with photons and tailor their experiments accordingly. CAST, in all its various forms, isn’t done with its mission yet.
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