Tuesday, April 8, 2008, 10:00 am — Seminar Room, Bldg. 725
Electric current fluctuations are one type of unavoidable machine
imperfections and induce magnetic-field perturbation
as a source of instabilities in accelerators.
This paper presents the measurement-based modeling
methodology of fluctuating electric current
arising from the power system of Fermilab's Booster synchrotron
to discuss the ramifications of the presence of ripple current
and space-charge defocusing effects.
We also present the method of generating stochastic noise
and the measurement and analysis methods
of ripple current and offending electromagnetic
interferences residing in the Booster power system.
This stochastic noise model, accompanied by
a suite of beam diagnostic calculations, manifests that
the fluctuating power-supply current, when coupled to space charge
and impinging upon a beam, can substantially enhance beam degradation
phenomena---such as emittance growth and halo formation---during the
Booster injection period.
Hosted by: John Hill
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