PAC09 - List of Authors (Ndabashimiye, G.)

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Ndabashimiye, G.

Paper	Title	Page
TH6REP078	Feedback Techniques and SPS Ecloud Instabilities – Design Estimates	4135
	J.D. Fox, T. Mastorides, G. Ndabashimiye, C.H. Rivetta, D. Van Winkle SLAC, Menlo Park, California J.M. Byrd, J.-L. Vay LBNL, Berkeley, California R. De Maria BNL, Upton, Long Island, New York W. Höfle, G. Rumolo CERN, Geneva
	Funding: Work supported by Department of Energy contract DE–AC03–76SF00515 and the US LARP program. The SPS at high intensities exhibits transverse single-bunch instabilities with signatures consistent with an Ecloud driven instability. While the SPS has a coupled-bunch transverse feedback system, control of Ecloud-driven motion requires a much wider control bandwidth capable of sensing and controlling motion within each bunched beam. This paper draws beam dynamics data from the measurements and simulations of this SPS instability, and develops initial performance requirements for a feedback system with 2-4 GS/sec sampling rates to damp Ecloud-driven transverse motion in the SPS at intensities desired for high-current LHC operation. Requirements for pickups, kickers and signal processing architectures are presented. Initial lab measurements of proof-of-principle lab model prototypes are presented for the wideband kicker driver signal functions.

Paper

Title

Page

TH6REP078

Feedback Techniques and SPS Ecloud Instabilities – Design Estimates

4135

J.D. Fox, T. Mastorides, G. Ndabashimiye, C.H. Rivetta, D. Van Winkle
SLAC, Menlo Park, California
J.M. Byrd, J.-L. Vay
LBNL, Berkeley, California
R. De Maria
BNL, Upton, Long Island, New York
W. Höfle, G. Rumolo
CERN, Geneva

Funding: Work supported by Department of Energy contract DE–AC03–76SF00515 and the US LARP program.

The SPS at high intensities exhibits transverse single-bunch instabilities with signatures consistent with an Ecloud driven instability. While the SPS has a coupled-bunch transverse feedback system, control of Ecloud-driven motion requires a much wider control bandwidth capable of sensing and controlling motion within each bunched beam. This paper draws beam dynamics data from the measurements and simulations of this SPS instability, and develops initial performance requirements for a feedback system with 2-4 GS/sec sampling rates to damp Ecloud-driven transverse motion in the SPS at intensities desired for high-current LHC operation. Requirements for pickups, kickers and signal processing architectures are presented. Initial lab measurements of proof-of-principle lab model prototypes are presented for the wideband kicker driver signal functions.