Measurement and Compensation of Coherent Laslett Tune Shifts in the Fermilab Main Ring

Gerig, R.; Moore, C. D.; Pruss, S.

doi:10.1109/tns.1981.4331731

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1981

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Cited by 3 publications

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“…Recently the Main Ring Group noticed a large intensity dependent coherent tune shift which seems to be describable as a Laslett tune shift. (4) In light of the interest caused by the rediscovery of the coherent tune shift, we decided to try to measure the incoherent shift again. Several factors contributed to this decision.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Incoherent Laslett Tune Shifts in the Fermilab Main Ring

Gerig

Moore

Pruss

1981

IEEE Trans. Nucl. Sci.

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Section: Introductionmentioning

confidence: 99%

Measurement of Incoherent Laslett Tune Shifts in the Fermilab Main Ring

Gerig

Moore

Pruss

1981

IEEE Trans. Nucl. Sci.

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Design for Fermilab Main Injector magnet ramps which account for hysteresis

Brown

Bhat

Harding

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Although the dominant fields in accelerator electromagnets are proportional to the excitation current, precise control of accelerator parameters requires a detailed understanding of the fields in Main Injector [1][2] magnets including contribution from eddy currents, magnet saturation, and hysteresis. Operation for decelerating beam makes such considerations particularly significant. Analysis of magnet measurements and design of control system software is presented. Field saturation and its effects on low field hysteresis are accounted for in specifying the field ramps for dipole, quadrupole and sextupole magnets. Some simplifying assumptions are made which are accepted as limitations on the required ramp sequences. Specifications are provided for relating desired field ramps to required current ramps for the momentum, tune, and chromaticity control.

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