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Hall C Steering Coils for Qweak

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

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Hall C Steering Coils for Qweak

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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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