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Experimental studies and analysis of the vertical emittance growth in the ATF extraction line in 2007-2008

Abstract : The Extraction Line (EXT) of the Accelerator Test Facility (ATF) at KEK will transport the electron beam from the ATF Damping Ring (DR) to the future ATF2 Final Focus beam line. Since several years, the vertical beam emittance measured in the EXT line is significantly larger than that measured in the DR itself, and there are observations that the growth increases with beam intensity. A possible contribution is the non-linearity in the magnetic fields experienced by the beam when passing off-axis through several magnets shared by the DR and the EXT beam line in the initial part of the extraction process. Tracking simulations including non-linear field errors in these magnets predict significant emittance growth when the beam is displaced vertically with respect to the nominal trajectory. An experimental program has been carried out during 2007-2008 to study the relation between the extraction trajectory and the anomalous emittance growth. This note reports on the results of this program.
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http://hal.in2p3.fr/in2p3-00424391
Contributor : Sabine Starita <>
Submitted on : Thursday, October 15, 2009 - 2:55:06 PM
Last modification on : Wednesday, September 16, 2020 - 4:19:50 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 10:44:16 PM

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LALRT0907.pdf
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  • HAL Id : in2p3-00424391, version 1

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IN2P3 | LAL | CNRS | LARA

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M. Alabau Pons, A. Faus-Golfe, P. Bambade, S. Kuroda, G. White, et al.. Experimental studies and analysis of the vertical emittance growth in the ATF extraction line in 2007-2008. 2009, pp.1-23. ⟨in2p3-00424391⟩

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