PAC09 - List of Authors (Field, R.C.)

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Field, R.C.

Paper	Title	Page
WE6PFP053	A Proposed Fast Luminosity Feedback for the Super-B Accelerator	2616
	K.J. Bertsche, R.C. Field, A.S. Fisher, M.K. Sullivan SLAC, Menlo Park, California A. Drago INFN/LNF, Frascati (Roma)
	Funding: Work supported by the Department of Energy under contract number DE-AC03-76SF00515. We present a possible design for a fast luminosity feedback for the Super-B Interaction Point (IP). The design is an extension of the fast luminosity feedback installed on the PEP-II accelerator. During the last two runs of PEP-II and BaBar (2007-2008), we had an improved luminosity feedback system that was able to maintain peak luminosity with faster correction speed than the previous system. The new system utilized fast dither coils on the High-Energy Beam (HEB) to independently dither the x position, the y position and the y angle at the IP, at roughly 100 Hz. The luminosity signal was then read out with three independent lock-in amplifiers. An overall correction was computed based on the lock-in signal strengths and beam corrections for position in x and y and in the y angle at the IP were simultaneously applied to the HEB. With the 100 times increase in luminosity for the SuperB design, we propose using a similar fast luminosity feedback that can operate at frequencies between DC and 1 kHz, high enough to be able to follow and nullify any vibrational beam motion from the final focusing magnets.

Paper

Title

Page

WE6PFP053

A Proposed Fast Luminosity Feedback for the Super-B Accelerator

2616

K.J. Bertsche, R.C. Field, A.S. Fisher, M.K. Sullivan
SLAC, Menlo Park, California
A. Drago
INFN/LNF, Frascati (Roma)

Funding: Work supported by the Department of Energy under contract number DE-AC03-76SF00515.

We present a possible design for a fast luminosity feedback for the Super-B Interaction Point (IP). The design is an extension of the fast luminosity feedback installed on the PEP-II accelerator. During the last two runs of PEP-II and BaBar (2007-2008), we had an improved luminosity feedback system that was able to maintain peak luminosity with faster correction speed than the previous system. The new system utilized fast dither coils on the High-Energy Beam (HEB) to independently dither the x position, the y position and the y angle at the IP, at roughly 100 Hz. The luminosity signal was then read out with three independent lock-in amplifiers. An overall correction was computed based on the lock-in signal strengths and beam corrections for position in x and y and in the y angle at the IP were simultaneously applied to the HEB. With the 100 times increase in luminosity for the SuperB design, we propose using a similar fast luminosity feedback that can operate at frequencies between DC and 1 kHz, high enough to be able to follow and nullify any vibrational beam motion from the final focusing magnets.