An electromagnetic helical undulator for polarized x-rays

Gluskin, E.; Винокуров, Н.А.; Tcheskidov, V. G.; Medvedko, A.; Evtushenko, Yu.A.; Kolmogorov, V. V.; Vobly, P.D.; Antokhin, E.; Ivanov, P.M.; Vasserman, I.; Trakhtenberg, E.; Hartog, P.K. Den; Deriy, B.; Erdmann, M.; Макаров, О. А.; Moog, E.R.

doi:10.1063/1.1291812

Cited by 10 publications

(3 citation statements)

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“…Polarization switching is achieved via a reversal of polarity of one set of coils. Such devices have been built at several places, e.g., PSI (Schmidt et al 2001), ELETTRA , APS (Gluskin et al 2000;Jaski et al 2013a,b), and SOLEIL (Batrakov et al 2007;Marcouille et al 2007). In other designs, one field component is generated from permanent magnets to push the fields further, particularly for shorter-period devices, and the other field component is produced with coils to permit a fast switching (Chavanne et al 1998a;Rogalev et al 1999;Marteau et al 2011).…”

Section: Elliptical and Helical Undulatorsmentioning

confidence: 98%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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Periodic magnetic structures, i.e., undulators and wigglers, have been used for nearly 40 years as sources of brilliant synchrotron radiation. Today, sophisticated undulator designs provide many degrees of freedom such as photon beam energy, variable polarization, and orbital angular momentum. Specific designs efficiently suppress higher orders or reduce the on-axis power density. All tuning parameters are required to be freely accessible by the users. Still, the majority of undulators is based on permanent magnets with a clear trend to short periods and in-vacuum and cryogenically cooled systems. Similar designs are used for storage rings and free electron lasers, though the field quality requirements are different. Today, the optimization of a specific experiment follows a global approach. This includes not only the undulator design itself but also local lattice modifications to cope with ambitious designs, elaborate tracking schemes to estimate the impact on the dynamic aperture, and last but not least radiation propagation tools which transport a realistic photon beam phase space to the sample. This chapter summarizes the theory of undulator radiation and reviews the technological realization of undulators and wigglers. Operational issues are discussed, as well.

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Section: Elliptical and Helical Undulatorsmentioning

confidence: 98%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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“…The 4-ID branch of the APS has two undulators working in parallel, one which provide low energy X-rays (0.5 keV up to 3 keV) feeding the 4-ID-C soft rays branch and other that provides high energy (3 -100 keV), feeding the 4-ID-D branch. Details on each one of these undulators can be found in [68] and [69]. We focus on the high energy branch More details on the information provided on this paragraph can be found in [70].…”

Section: X-ray Absorption Spectroscopy Measurementsmentioning

confidence: 99%

High pressure magnetism of EuB6 probed with X-ray spectroscopy techniques

Oparacz Kutelak

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Gostaria de agradecer todos aqueles que me apoiaram durante a jornada academica desde o inicio da graduac ¸ão até o presente momento. Em especial agradec ¸o meu orientador Ricardo Donizeth dos Reis por me propiciar oportunidades de valor inestimavel, meu corientador Flavio Guimarães Gandra por seus preciosos conselhos e Michael Nicklas pelo acolhimento propiciado no instituto Max Planck. Agradec ¸o ao grupo EMA e o laboratório de Altas Pressões do SIRIUS-LNLS por todo suporte experimental disponibilzado. Agradec ¸o imensamente a imprescindivel ajuda de Eduardo Poldi, Gustavo Lombardi e Marcos Eleoterio fornecida nos experimentos desse trabalho, assim como Mário Piva pela ajuda especial no periodo no exterior. Extendo agradecimentos para Jairo Fonseca pela sua paciencia em me auxiliar no laboratorio, Lucas Francisco pelo apoio computacional, teórico e discussões valiosas. Aos integrantes do grupo EMA, Alvaro, Bárbara, Danusa, Judá, Kelin, Ulisses e Rodrigo pela participac ¸ão ativa para meu amadurecimento academico. Destaco que, sem as ideias ambiciosas e estrutura laboratorial instaurada por Narcizo Marques de Souza Neto esse trabalho não seria possível. Aproveito para agradecer o fundamental apoio de Priscila Rosa ao fornecer as amostras para esse trabalho, também Gilberto Fabbris e Daniel Haskel pelo apoio na linha 4-ID-D do APS nos experimentos de XAS, Ercan Esen Alp e Jiyong Zhao pelo apoio nos experimentos de Mössbauer na linha 3-ID-D. Por fim gradec ¸o aos meus amigos Alan, Bruna, Leonardo Marcon, Marina e Rafael que não só me ajudaram com suas conversas e ideias mas também tornaram esse periodo de mestrado em algo muito especial que será lembrado com muito carinho para o resto de minha vida. O presente trabalho foi realizado com apoio da Coordenac ¸ão de Aperfeic ¸oamento de Pessoal de Nível Superior Brasil (CAPES) -Código de Financiamento 001. Também agradec ¸o o apoio financeiro das agencias de fomento CNPq (135947/ 2018-9) e FAPESP, a partir do projeto 2018/19015-1 e do projeto JP 2018/00823-0. ResumoA familia dos hexaboretos de terras raras apresenta uma rica variedade em fenômenos de transporte, indo de supercondutores a isolantes de Kondo. Recentemente compostos como SmB 6 e YbB 6 foram revisitados a partir de propostas de topologia não trivial correlacionados a estados de valencia mista em seus diagramas de fase. Isso abre perspectivas de estados exóticos em demais compostos da família, principalmente ao utilizar parametros de ajuste como pressão hidrostatica, explorando possiveis conexões entre esses compostos contendo ions com eletrons bem localizados na camada 4f.Nesse trabalho exploramos o EuB 6 , único da familia que apresenta ferromagnetismo bem definido em pressões de até cerca de 17 GPa. Além disso o composto apresenta duas transic ¸ões envolvendo formac ¸ão de polarons magnéticos e deslocalizac ¸ão de portadores de cargas, com discussões em aberto sobre seu caráter semimetálico ou semicondutor. Nesse trabalho observamos, através de técnicas de espectroscopia de absorc ¸ão de raios x (XAS) e...

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“…For example, a skew quadrupole introduces a coupling between horizontal and vertical motion of the particles in the beam, and a skew octupole leads to a reduction of beam lifetime. [2,3]. This device, outfitted with a skew-quadrupole correction lens and a skew-octupole correction lens, is now in operation in the APS storage ring.…”

Section: Introductionmentioning

confidence: 99%

Planar electromagnetic multipole correctors for a circularly polarized undulator

Sasaki

Vasserman

Trakhtenberg

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Planar electromagnetic correction lenses were designed, constructed, and installed in order to compensate skew multipole components generated by an electromagnetic circularly polarizing undulator (CPU) for the Advanced Photon Source (APS). The reason for selection of the planar configuration is that the corrector lenses should fit around a flat undulator vacuum chamber. Comparison was made between the measured strength of skew multipole components and results calculated by the 3D code RADIA [1].

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An electromagnetic helical undulator for polarized x-rays

Cited by 10 publications

References 1 publication

Shaping Photon Beams with Undulators and Wigglers

Shaping Photon Beams with Undulators and Wigglers

High pressure magnetism of EuB6 probed with X-ray spectroscopy techniques

Planar electromagnetic multipole correctors for a circularly polarized undulator

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