IPAC2014 - List of Authors (Muto, M.)

Paper	Title	Page
TUPRO093	Numerical Study of Intrinsic Ripples in J-PARC Main-ring Magnets	1256
	Y. Shirakabe, A.Y. Molodozhentsev, M. Muto KEK, Ibaraki, Japan
	Beam ripples are one of the critical problems in high power proton synchrotrons. Magnet field ripples are considered as a main origin of the beam ripples among various possible sources. Although magnet power supply ripples are generally treated as the dominating ripple source, the load circuit parameters of the magnets and their interconnections are also playing critical roles in defining the ripple amplitudes and frequencies. In this viewpoint, the magnet power supplies are treated as simplified current sources, and the ripples generated in the circuit systems are investigated both in analytical and numerical ways. One of the findings in this direction of investigation is the existence of intrinsic ripples. The intrinsic ripples occur inevitably in the synchrotron magnets, no matter how the power supplies are producing idealistic current ramp patterns. Their amplitudes are defined by the circuit parameters such as inductance and capacitance, and the ramp parameters such as ramp rates. Some of the analytical mechanisms in generating the magnet field ripples are presented as well as the studied examples.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO093
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Paper

Title

Page

Numerical Study of Intrinsic Ripples in J-PARC Main-ring Magnets

1256

Y. Shirakabe, A.Y. Molodozhentsev, M. Muto
KEK, Ibaraki, Japan

Beam ripples are one of the critical problems in high power proton synchrotrons. Magnet field ripples are considered as a main origin of the beam ripples among various possible sources. Although magnet power supply ripples are generally treated as the dominating ripple source, the load circuit parameters of the magnets and their interconnections are also playing critical roles in defining the ripple amplitudes and frequencies. In this viewpoint, the magnet power supplies are treated as simplified current sources, and the ripples generated in the circuit systems are investigated both in analytical and numerical ways. One of the findings in this direction of investigation is the existence of intrinsic ripples. The intrinsic ripples occur inevitably in the synchrotron magnets, no matter how the power supplies are producing idealistic current ramp patterns. Their amplitudes are defined by the circuit parameters such as inductance and capacitance, and the ramp parameters such as ramp rates. Some of the analytical mechanisms in generating the magnet field ripples are presented as well as the studied examples.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO093

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)