Initial tests of an AC dipole for the Tevatron Page: 1 of 9
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FERMILABAB-CONF-06-165-AD
Initial Tests of an AC Dipole for the Tevatron
R. Miyamoto*, A. Jansson , S. Kopp*, and M. Syphers
*The University of Texas at Austin, Department of Physics, Austin, Texas 78712
tFermi National Accelerator Laboratory, Batavia, Illinois 60510
Abstract. The AC dipole is a device to diagnose transverse motions of a beam. It can achieve
large-amplitude oscillations without two inevitable problems of conventional kicker/pinger
magnets: decoherence and emittance growth. While not the first synchrotron to operate with an
AC dipole, the Tevatron can now make use of its recently upgraded BPM system, providing
unprecedented resolution for use with an AC dipole, to measure both linear and nonlinear
properties of the accelerator. Plans are to provide AC dipole systems for both transverse degrees
of freedom. Preliminary tests have been done using an audio power amplifier with an existing
vertical pinger magnet, producing oscillation amplitudes up to 26 at 150 GeV. In this paper, we
will present the configuration of this system. We also show the analysis of a first few data sets,
including the direct measurement of beta functions at BPM locations.
Keywords: AC Dipole, Lattice Measurement.
PACS: 29.27.-a, 41.85.-p
INTRODUCTION
Motivation
The AC dipole is a tool to study transverse motions of a beam in a synchrotron. As
kicker/pinger magnets which have been conventionally used to make measurements of
beam properties, the AC dipole also creates transverse oscillations with large
amplitudes but it is done by driving the beam instead of giving a single turn kick. As
stated in [1] and [2], the AC dipole has two advantages over the kicker/pinger magnets.
First, the signal of the oscillation created by the AC dipole does not decohere. This is
particularly important in measurements of nonlinear properties of a beam. Second,
there is no significant emittance growth after the usage of the AC dipole and, hence,
beam diagnosis based on the AC dipole can be done even during usual operations of a
synchrotron. These properties of the AC dipole have been proven through previous
experiments in AGS and RHIC at BNL and in SPS at CERN [3], [4], and [5].
The BPM system of the Tevatron has been recently upgraded and its resolution is
now as low as 20 m. With this BPM system, the AC dipole is expected to make it
possible to measure both linear and nonlinear properties at an unprecedented level.
Hence, the plan is to install the AC dipole systems for both transverse degrees of
freedom.
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Miyamoto, R.; Jansson, A.; Kopp, S. & Syphers, M. Initial tests of an AC dipole for the Tevatron, article, June 1, 2006; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc873588/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.