The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2006
Filed:
Sep. 20, 2004
Nikolai I. Sinkine, Newport News, VA (US);
Chen Yan, Yorktown, VA (US);
Cornelis Apeldoorn, Gloucester, VA (US);
Jeffrey Glenn Dail, Poquoson, VA (US);
Randolph Frank Wojcik, Yorktown, VA (US);
William Gunning, Newport News, VA (US);
Nikolai I. Sinkine, Newport News, VA (US);
Chen Yan, Yorktown, VA (US);
Cornelis Apeldoorn, Gloucester, VA (US);
Jeffrey Glenn Dail, Poquoson, VA (US);
Randolph Frank Wojcik, Yorktown, VA (US);
William Gunning, Newport News, VA (US);
Southeastern Univ. Research Assn., Newport News, VA (US);
Abstract
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.