Superconducting magnet system for generating high homogeneity and high magnetic field
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United States of America Patent
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Jun 19, 2012
Grant Date -
Apr 7, 2011
app pub date -
Jan 20, 2009
filing date -
Dec 11, 2008
priority date (Note) -
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Abstract
A superconducting magnet system for generating high homogeneity and high magnetic field consists of a main coil, an outer coil, a quench protection circuit, a quench heater and a power supply. The main coil is composed of many concentric solenoid coils which are arranged from inside to outside. The outer coil out of the main coil includes a first back roll coil, a second back roll coil, a first superconducting coil for compensating sixth harmonic component, a second superconducting coil for compensating sixth harmonic component, a shielding ring and a shielding coil from inside to outside. Every loop circuit of the quench protection circuit is composed of a corresponding protection resistor, a diode and coil which is connected in series each other, and each coil has a corresponding quench protection heater. The classification linear diameter difference of the superconducting coils which contact each other in main coil is less than 0.05 mm. The homogeneity of the magnetic field in the 50 mm diameter working space is 0.15 ppm, because the high order harmonic component of the field is compensated by back roll method.
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