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Qweak Steering Coils for Beam Locking and Motion Correction

University of Winnipeg's contribution to Qweak project involving saddle coils on ceramic beam pipe, H and V coils, cavity monitors, and electronic components for beam locking and motion correction. Detailed design parameters ensure precise beam control. Funded by NSERC and with expertise from JLab. Design finalized in 2005 for construction and testing in 2006.

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Qweak Steering Coils for Beam Locking and Motion Correction

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  1. Hall C Steering Coils for Qweak J. W. Martin University of Winnipeg

  2. Motivation • To “lock” the beam onto target through a feedback loop. (DC lock) • Possibly, to induce/correct helicity-correlated beam motion. (300 Hz square wave  high bandwidth) • these would likely be different sets of coils • University of Winnipeg contribution to Qweak. Corresponding increase of scope for Canadian group.

  3. Schematic saddle coils on ceramic beam pipe H coil V coil Cavity Monitor(s) target beam Mixing Electronics Power amplifier

  4. Typical Design Parameters • coils placed on girder or farther upstream of experiment. • provide beam motion below 1 mm at target • saddle coils typ. 10 mA-turns. • minimize self-inductance (typ < 0.1 H) thanks to Litz wire. • bandwidth into 10 kHz range.

  5. Budget • J. W. Martin Discovery Grant (NSERC) funded April 1, 2005. • JLab contributions, expertise (C. Yan, R. Carlini)

  6. Schedule • Finalize design 2005. • Construct/test 2006.

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