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Linear beam raster magnet driver based on H-bridge technique

United States Patent

June 6, 2006
View the Complete Patent at the US Patent & Trademark Office
Thomas Jefferson National Accelerator Facility - Visit the Technology Review Committee Website
An improved raster magnet driver for a linear particle beam is based on an H-bridge technique. Four branches of power HEXFETs form a two-by-two switch. Switching the HEXFETs in a predetermined order and at the right frequency produces a triangular current waveform. An H-bridge controller controls switching sequence and timing. The magnetic field of the coil follows the shape of the waveform and thus steers the beam using a triangular rather than a sinusoidal waveform. The system produces a raster pattern having a highly uniform raster density distribution, eliminates target heating from non-uniform raster density distributions, and produces higher levels of beam current.
Sinkine; Nikolai I. (Newport News, VA), Yan; Chen (Yorktown, VA), Apeldoorn; Cornelis (Gloucester, VA), Dail; Jeffrey Glenn (Poquoson, VA), Wojcik; Randolph Frank (Yorktown, VA), Gunning; William (Newport News, VA)
Southeastern Univ. Research Assn. (Newport News, VA)
10/ 945,408
September 20, 2004
1) The United States of America may have certain rights to this invention under Management and Operating contract No. DE-AC05-84ER40150 from the Department of Energy.