Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-04-21
1988-10-25
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324300, 165 12, 165 64, G01R 3320
Patent
active
047806761
ABSTRACT:
A method and a device serve for cooling a magnet system, in particular a magnet system (50) of a nuclear spin tomograph, with high homogeneity of the magnetic field. A coil (51, 52, 53, 54) made from an electrically conductive material having a finite active resistance is connected to a power supply unit (72). A cooling body being in thermally conductive contact with the coil (51, 52, 53, 54) is passed by a cooling agent. In a first operating mode, at rated duty, the coil (51, 52, 53, 54) is supplied with a rated current, and the active throughput of the cooling agent is adjusted to a rated value. In order to keep the energy costs low during inoperative times of the magnet system, while keeping the waiting trimes required when the magnet system is switched on again as low as possible, a second operating mode, defined as stand-by duty, is provided during which the coil (51, 52, 53, 54) is supplied with a rest current and the active throughput of the cooling agent is adjusted to a rest value.
REFERENCES:
patent: 4276529 (1981-06-01), Heinzerling et al.
patent: 4660013 (1987-04-01), Laskaris et al.
patent: 4672346 (1987-06-01), Miyamoto et al.
Goebel Klaus
Muller Wolfgang
O'Shea Kevin D.
Tokar Michael J.
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