Magnet Types
Depending on the configuration, the MR instrument is equipped with one of the following superconducting magnet types:
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- USR magnet type: The ultra-shielded and refrigerated magnet technology is a zero-boil-off instrument with pulse tube cooler and minimized external fields. These magnets contain liquid helium, but no nitrogen. The used refrigeration technology prevents that the liquid helium vaporizes by continuously recycling. Therefore, the helium has not to be refilled.
The service interval of these magnets is limited to maintaining the coldhead. All servicing work on the magnets must be performed by the Bruker Service.
Typical magnets using this technology: 47/40 USR, 70/20 USR, 70/30 USR, 94/20 USR, 94/30 USR, 117/16 USR.
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- US/R magnet type: The ultra-shielded/refrigerated magnet technology has a pulse tube cooler and minimized external fields. These magnets contain liquid helium, but no nitrogen.
The used refrigeration technology minimizes the vaporized helium. Therefore, the liquid helium has to be refilled once a year. The service interval of these magnets is limited to maintaining the coldhead.
All servicing work on the magnets must be performed by the Bruker Service.
Bruker recommends refilling the liquid helium by the Bruker Service, but trained and authorized laboratory personal could also refill.
Typical magnets using this technology: 94/11 US/R, 117/11 US/R, 152/11 US/R.
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- US magnet type: The ultra-shielded magnet technology has minimized external fields. These magnets contain liquid helium and liquid nitrogen. The liquid helium has to be refilled once a month. The liquid nitrogen has to be refilled once a week.
All servicing work on the magnets must be performed by the Bruker Service.
Bruker recommends refilling the liquid helium by the Bruker Service, but trained and authorized laboratory personal could also refill.
Typical magnets using this technology: 47/16 US and 70/16 US.