Quote:
Originally Posted by Electronpusher0
While we are at it how about Helium cooled superconducting magnets for loudspeakers?
Peter
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Well it is possible to use a Helium cooled MRI magnet system
as a loudspeaker- as demonstrated historically in Magnet Test at Oxford Magnet Technology around Christmas to play a few carols a good few years back. (That sort of thing would be frowned on rather heavily nowadays). Just connect your Walkman headphone output to the test input to one of the Gradient Amplifiers (normally used for bending the magnet's field during the imaging process). Frequency response wasn't great and a lot of audio (kilowatts) is needed since a lot of effort goes into preventing the gradient coils from moving when subjected to their normal drive pulse otherwise the noise level in the magnet room for the unfortunate being imaged would be unbearable. It's loud enough as it is!
Another downside is the sheer cost of running the thing (never mind the prime cost)- just keeping a typical magnet cold takes a continuous 6 or 7 kilowatts to drive the refrigeration system.
All good fun, though
