Cargando…

Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields

Coherent synchrotron radiation (CSR) is a collective effect that mainly occurs when the trajectory of an electron beam is bent in a dipole magnet. It affects the electron beam by distorting the phase space along its slice distribution, which leads to emittance growth. Therefore, CSR should be suppre...

Descripción completa

Detalles Bibliográficos
Autores principales: Kim, S Y, Chung, M, Doebert, S, Yoon, E S
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevAccelBeams.24.021301
http://cds.cern.ch/record/2757352
_version_ 1780969978553434112
author Kim, S Y
Chung, M
Doebert, S
Yoon, E S
author_facet Kim, S Y
Chung, M
Doebert, S
Yoon, E S
author_sort Kim, S Y
collection CERN
description Coherent synchrotron radiation (CSR) is a collective effect that mainly occurs when the trajectory of an electron beam is bent in a dipole magnet. It affects the electron beam by distorting the phase space along its slice distribution, which leads to emittance growth. Therefore, CSR should be suppressed to transport electron beams without further degradation of the emittance. In linear optics, CSR-induced emittance can be suppressed by controlling the Twiss parameters along the electron-beam transfer line. However, owing to some physical constraints, transfer-line optics may be governed by higher-order terms in the transfer map, and the use of a sextupole magnet to suppress these terms would be very challenging for low-energy-spread and low-emittance beams. Therefore, without using a sextupole magnet, we estimate the region of the Twiss parameters where the first-order terms are dominant along the transfer line by introducing chromatic amplitude. In this region, we can apply the suppression condition that is valid in a linear matrix system. This minimization of the emittance growth becomes even more important when the electron-beam transfer line is used for external injection into a plasma wakefield because mismatched beam conditions could induce an additional increase in the emittance during the acceleration. In this paper, we discuss a method of emittance-growth minimization driven by the CSR effect along the transfer line, which is particularly used for electron-beam injection into plasma wakefields. In addition, using the particle-in-cell simulation, we investigate the evolution of electron beam parameters during the acceleration through plasma wakefields in the presence of the CSR effect on the electron beam. We confirm that the beam emittance growth is minimized when the CSR effect is properly controlled. Otherwise, it is found that 11%–32% emittance growths by the CSR effect along the transfer line lead to additional 20%–40% increase of the maximum slice emittance.
id oai-inspirehep.net-1847953
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
record_format invenio
spelling oai-inspirehep.net-18479532021-03-19T22:31:32Zdoi:10.1103/PhysRevAccelBeams.24.021301http://cds.cern.ch/record/2757352engKim, S YChung, MDoebert, SYoon, E SSuppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefieldsAccelerators and Storage RingsCoherent synchrotron radiation (CSR) is a collective effect that mainly occurs when the trajectory of an electron beam is bent in a dipole magnet. It affects the electron beam by distorting the phase space along its slice distribution, which leads to emittance growth. Therefore, CSR should be suppressed to transport electron beams without further degradation of the emittance. In linear optics, CSR-induced emittance can be suppressed by controlling the Twiss parameters along the electron-beam transfer line. However, owing to some physical constraints, transfer-line optics may be governed by higher-order terms in the transfer map, and the use of a sextupole magnet to suppress these terms would be very challenging for low-energy-spread and low-emittance beams. Therefore, without using a sextupole magnet, we estimate the region of the Twiss parameters where the first-order terms are dominant along the transfer line by introducing chromatic amplitude. In this region, we can apply the suppression condition that is valid in a linear matrix system. This minimization of the emittance growth becomes even more important when the electron-beam transfer line is used for external injection into a plasma wakefield because mismatched beam conditions could induce an additional increase in the emittance during the acceleration. In this paper, we discuss a method of emittance-growth minimization driven by the CSR effect along the transfer line, which is particularly used for electron-beam injection into plasma wakefields. In addition, using the particle-in-cell simulation, we investigate the evolution of electron beam parameters during the acceleration through plasma wakefields in the presence of the CSR effect on the electron beam. We confirm that the beam emittance growth is minimized when the CSR effect is properly controlled. Otherwise, it is found that 11%–32% emittance growths by the CSR effect along the transfer line lead to additional 20%–40% increase of the maximum slice emittance.oai:inspirehep.net:18479532021
spellingShingle Accelerators and Storage Rings
Kim, S Y
Chung, M
Doebert, S
Yoon, E S
Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
title Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
title_full Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
title_fullStr Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
title_full_unstemmed Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
title_short Suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
title_sort suppression of coherent synchrotron radiation induced emittance growth during electron-beam injection into plasma wakefields
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1103/PhysRevAccelBeams.24.021301
http://cds.cern.ch/record/2757352
work_keys_str_mv AT kimsy suppressionofcoherentsynchrotronradiationinducedemittancegrowthduringelectronbeaminjectionintoplasmawakefields
AT chungm suppressionofcoherentsynchrotronradiationinducedemittancegrowthduringelectronbeaminjectionintoplasmawakefields
AT doeberts suppressionofcoherentsynchrotronradiationinducedemittancegrowthduringelectronbeaminjectionintoplasmawakefields
AT yoones suppressionofcoherentsynchrotronradiationinducedemittancegrowthduringelectronbeaminjectionintoplasmawakefields