CERN Accelerating science

Published Articles
Report number	CERN-ACC-2016-0096
Title	Use of RF quadrupole structures to enhance stability in accelerator rings
Author(s)	Schenk, Michael (Ecole Polytechnique, Lausanne ; CERN) ; Grudiev, Alexej (CERN) ; Li, Kevin Shing Bruce (CERN) ; Papke, Kai (CERN)
Publication	2016
Imprint	13 Jul 2016
Number of pages	6
In:	57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.THPM7X01
DOI	10.18429/JACoW-HB2016-THPM7X01
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN SPS
Project	CERN HL-LHC
Free keywords	HL-LHC ; SPS ; transverse collective instabilities ; Landau damping ; rf quadrupole ; second order chromaticity ; synchro-betatron resonances ; PyHEADTAIL
Abstract	The beams required for the high luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN call for efficient mechanisms to suppress transverse collective instabilities. In addition to octupole magnets installed for the purpose of Landau damping, we propose to use radio frequency (rf) quadrupole structures to considerably enhance the aforementioned stabilising effect. By means of the PyHEADTAIL macroparticle tracking code, the stabilising mechanism introduced by an rf quadrupole is studied and discussed. As a specific example, the performance of an rf quadrupole system in presence of magnetic octupoles is demonstrated for HL-LHC. Furthermore, potential performance limitations such as the excitation of synchro-betatron resonances are pointed out. Finally, efforts towards possible measurements with the CERN Super Proton Synchrotron (SPS) are discussed aiming at studying the underlying stabilising mechanisms experimentally.
Copyright/License	CC-BY-3.0

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