Simulation of incoherent ion effects in electron storage rings

Ion trapping occurs when a negatively charged beam ionizes residual gas inside an accelerator vacuum chamber, and the resulting ions become trapped in the beam potential. In addition to the well-understood coherent instability, trapped ions can cause incoherent effects, such as emittance growth and...

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Autores principales:	J. Calvey, M. Borland
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/ef5679e5f7fa40f5b4ea9562180da729
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spelling	oai:doaj.org-article:ef5679e5f7fa40f5b4ea9562180da7292021-12-03T16:25:50ZSimulation of incoherent ion effects in electron storage rings10.1103/PhysRevAccelBeams.24.1244012469-9888https://doaj.org/article/ef5679e5f7fa40f5b4ea9562180da7292021-12-01T00:00:00Zhttp://doi.org/10.1103/PhysRevAccelBeams.24.124401http://doi.org/10.1103/PhysRevAccelBeams.24.124401https://doaj.org/toc/2469-9888Ion trapping occurs when a negatively charged beam ionizes residual gas inside an accelerator vacuum chamber, and the resulting ions become trapped in the beam potential. In addition to the well-understood coherent instability, trapped ions can cause incoherent effects, such as emittance growth and tune spread. Typically, simulation of ion effects is done using a weak-strong model, in which the ions are modeled using macroparticles, but the beam is assumed to be a fixed Gaussian distribution, with only centroid motion allowed. This type of model necessarily neglects intra-bunch effects. Recently, a residual gas ion modeling capability has been incorporated into the particle tracking code elegant. Both the beam and ions are modeled using macroparticles, so incoherent effects can be studied. The code models ion generation, movement of ions between bunches, and beam-ion interactions. It has also been parallelized and can be used in combination with other elegant elements. The code has been used to study ion instability in the present APS storage ring. Once several important effects are included (multiple ionization, transverse impedance, and charge variation between bunches), the simulations show good agreement with the measured data.J. CalveyM. BorlandAmerican Physical SocietyarticleNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENPhysical Review Accelerators and Beams, Vol 24, Iss 12, p 124401 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 J. Calvey M. Borland Simulation of incoherent ion effects in electron storage rings
description	Ion trapping occurs when a negatively charged beam ionizes residual gas inside an accelerator vacuum chamber, and the resulting ions become trapped in the beam potential. In addition to the well-understood coherent instability, trapped ions can cause incoherent effects, such as emittance growth and tune spread. Typically, simulation of ion effects is done using a weak-strong model, in which the ions are modeled using macroparticles, but the beam is assumed to be a fixed Gaussian distribution, with only centroid motion allowed. This type of model necessarily neglects intra-bunch effects. Recently, a residual gas ion modeling capability has been incorporated into the particle tracking code elegant. Both the beam and ions are modeled using macroparticles, so incoherent effects can be studied. The code models ion generation, movement of ions between bunches, and beam-ion interactions. It has also been parallelized and can be used in combination with other elegant elements. The code has been used to study ion instability in the present APS storage ring. Once several important effects are included (multiple ionization, transverse impedance, and charge variation between bunches), the simulations show good agreement with the measured data.
format	article
author	J. Calvey M. Borland
author_facet	J. Calvey M. Borland
author_sort	J. Calvey
title	Simulation of incoherent ion effects in electron storage rings
title_short	Simulation of incoherent ion effects in electron storage rings
title_full	Simulation of incoherent ion effects in electron storage rings
title_fullStr	Simulation of incoherent ion effects in electron storage rings
title_full_unstemmed	Simulation of incoherent ion effects in electron storage rings
title_sort	simulation of incoherent ion effects in electron storage rings
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/ef5679e5f7fa40f5b4ea9562180da729
work_keys_str_mv	AT jcalvey simulationofincoherentioneffectsinelectronstoragerings AT mborland simulationofincoherentioneffectsinelectronstoragerings
_version_	1718373183192563712

Simulation of incoherent ion effects in electron storage rings

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