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Passive, achromatic, nearly isochronous bending system

United States Patent

May 18, 2004
View the Complete Patent at the US Patent & Trademark Office
Thomas Jefferson National Accelerator Facility - Visit the Technology Review Committee Website
A particle beam bending system having a geometry that applies active bending only beyond the chord of the orbit for any momentum component. Using this bending configuration, all momentum components emerge dispersed in position only; all trajectories are parallel by construction. Combining a pair of such bends with reflective symmetry produces a bend cell that is, by construction, achromatic to all orders. By the particular choice of individual bends, a pair of such achromats can be used as the basis of a recirculation arc. Other rational fractions of a full bend serve equally well (e.g., 2 bends/ cell /arc; 2 bends/ cells/arc, etc), as do combinations of multiple bending numerologies (e.g., 2 bends/ cells+2 bends/ cell). By the choice of entry pole face rotation of the first magnet and exit pole face rotation of the second magnet (with a value to be determined from the particular beam stability requirements imposed by the choice of bending angle and beam properties to be used in any particular application), desirable focusing properties can be introduced and beam stability can be insured.
Douglas; David R. (Yorktown, VA), Yunn; Byung C. (Yorktown, VA)
Southeastern Univ. Research Assn., Inc. (Newport News, VA)
10/ 307,075
November 29, 2002
The United States of America may have certain rights to this invention under Management and Operating contract No. DE-AC05-84ER 40150 from the Department of Energy.