LOCO at the Australian Synchrotron

The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electron Beam Position Processors from I-Tech (EBPPs) [1]. The EBPPs are capable of measuring beam position data at turn-byturn (TBT) rates and have long history buffers. TBT data from the EBPPs has been used to determine the linear optics of the storage ring lattice using techniques developed at other facilities. This is a useful complement to other methods of determining the linear optics such as LOCO. Characteristics of the EBPPs such as beam current dependence have been studied during commissioning and will also be presented.

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“…Using POISSON, simulations gave gain factors of ~14.6 mm in both planes. Results from LOCO later put these values closer to ~15.3 ±1% [3].…”

Section: Introductionmentioning

confidence: 83%

Storage ring turn-by-turn BPMS at the Australian Synchrotron

Tan

Spencer

Boland

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…The principal information that is studied in this process is related to the linear optics functions (betatron and dispersion functions), allowing for disturbances detection and, more importantly, to obtain the corrections that bring the real machine parameters closer to the nominal. This method has been applied to several synchrotrons over the years and has been proven to be efficient both to detect optics perturbations and to correct the machine linear optics [34,49,50]. Besides that, with the realization of 4 th generation light sources, which use innovative and very compact magnetic lattices and optics, some details and subtleties of LOCO should be revisited to successfully apply the method in modern machines such as the Sirius storage ring.…”

Section: Linear Couplingmentioning

confidence: 99%

Linear optics and coupling corrections applied to Sirius commissioning

Barbosa Alves

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Agradeço e dedico este trabalho aos meus pais, Elaine e Luciano, que sempre acreditaram em mim em todas etapas da minha vida e sempre fizeram de tudo para que nunca me faltasse nada. Agradeço à minha irmã Mirela pela curiosidade e interesse nas suas perguntas e pela amizade que estamos desenvolvendo ao longo dos anos.Agradeço ao Grupo de Física de Aceleradores do LNLS por todo suporte. Fundamentalmente tudo que sei nesta área, aprendi com vocês. Tenho muito orgulho e sou grato por compartilhar dias e noites de muito trabalho, discussões e cafés com vocês.Agradeço à Liu por todas as oportunidades, sobretudo a de trabalhar com este tema, e também por sempre estar aberta a discussões e a compartilhar seu conhecimento e experiência. Agradeço ao Fernando por ser um grande companheiro de trabalho desde o início, com sua didática e empolgação para conversar sobre tudo, especialmente ciência. Agradeço ao Ximenes pelas discussões, companhia nas aulas e pela ajuda na organização dos códigos no ínicio das implementações. Agradeço à Ana pela ajuda e atenção, além de suas excelentes interfaces gráficas que muito facilitam a operação e estudos de máquina no Sirius.Agradeço ao Prof. Rubens por ter aceitado ser meu orientador, pelo incentivo e sugestões ao longo do trabalho.Agradeço à Ana Clara por todo companheirismo e amor de todos esses anos. Desde a época dos vestibulares até à pós-graduação, você sempre esteve comigo em cada momento e os fez muito mais felizes. Sua companhia alegra e torna essa jornada mais leve.Agradeço ao programa de pós-graduação do IFGW/UNICAMP, aos professores e funcionários que realizam seus trabalhos de forma competente e exemplar, contribuindo enormemente para o desenvolvimento da Física no Brasil.Finalmente, agradeço ao LNLS/CNPEM e aos seus membros, por toda infraestrutura disponibilizada e todo trabalho coletivo de alto nível que resultou no Sirius, o maior complexo científico brasileiro que possibilitou a existência deste mestrado. ResumoSirius é a nova fonte de luz síncrotron de 4 a geração e baixa emitância do Laboratório Nacional de Luz Síncrotron (LNLS), onde elétrons de 3 GeV são mantidos em condições estáveis, em ultra-alto vácuo ao longo de um anel de armazenamento de 518 m de circunferência sob a ação de campos eletromagnéticos. A matriz resposta de órbita devido a variações de campos dipolares localizados pode ser usada para ajustar a ótica linear e termos de acoplamento bétatron de uma rede magnética a partir de um modelo, usando o método chamado Linear Optics from Closed Orbits (LOCO). Neste trabalho, o método LOCO foi estudado e implementado no anel de armazenamento do Sirius, a fim de calibrar e corrigir ótica linear e acoplamento durante o comissionamento. Vários testes foram realizados com o código implementado usando dados simulados e medidos, obtendo resultados que verificaram a robustez do método. A escolha do algoritmo de minimização e a inclusão de vínculos nas variações de gradientes nos quadrupolos foram fatores importantes para a aplicação do método no Sirius. Os ajustes L...

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“…Since then, the technique has been further improved and is typically referred to as extracting linear optics from closed orbit measurements [23]. It has been successfully employed at various synchrotron light sources [24,25,26,27,28,29,30]. Following the success of the method for synchrotron light sources, it has been applied at other facilities operating hadron synchrotrons [31,32,33,34,35,36].…”

Section: Introductionmentioning

confidence: 99%

Efficient modeling and mitigation of quadrupole errors in synchrotrons and their beam transfer lines

Vilsmeier

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This thesis investigates the problem of estimating quadrupole errors on synchrotrons as well as how to minimize the influence of quadrupole errors for beam transfer lines (beamlines). It emphasizes the importance to treat possible error sources in all parts of an accelerator in order to provide constantly high beam quality to the experimental stations. While the presented methods have been investigated by using the example of the SIS18 synchrotron and the HEST beamlines at GSI Helmholtz Centre for Heavy Ion Research, they are equally relevant for the future synchrotrons and beamlines of the Facility for Antiproton and Ion Research in Europe (FAIR). Part 1 discusses the problem of estimating quadrupole errors via orbit response measurements at synchrotrons. An emphasis is put on investigating the influence of the availability of steerer magnets and beam position monitors (BPMs) on the solvability of the inverse problem as well as on the propagation of measurement uncertainty for the estimation of quadrupole errors. The problem is approached via analytical considerations as well as via dedicated simulation studies. By developing an analytical expression for the Jacobian matrix, the theoretical boundaries for the solvability of the inverse problem are derived. Moreover, it is shown that the analytical expressions for the Jacobian matrix can be used during the fitting procedure to achieve a significant improvement in the computational efficiency by a factor $N_{steerers} \times N_{quadrupoles}$, where $N$ denotes the number of lattice elements of the respective type. The presented results are tested via dedicated measurements at the SIS18 synchrotron. Part 2 discusses – complementary to part 1 – the influence of quadrupole errors in beam transfer lines with respect to the beam quality requirements given by the experimental stations. A preventive approach is presented which allows to minimize the influence of possible quadrupole errors on the degradation of beam quality. By identifying and selecting robust quadrupole configurations, a stable operation of the beamline can be enabled and the time needed by operators to readjust the beamline parameters can be reduced. The concept of beamline robustness is developed and is studied with the help of dedicated simulations. The simulation results are used to identify certain properties that distinguish robust from nonrobust quadrupole configurations. Also, various methods for improving the computational process of identifying robust quadrupole configurations are presented. The methods and results are tested via dedicated measurements at two different beamlines at GSI Helmholtz Centre for Heavy Ion Research and at Forschungszentrum Jülich.

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LOCO at the Australian Synchrotron

Cited by 3 publications

References 3 publications

Storage ring turn-by-turn BPMS at the Australian Synchrotron

Storage ring turn-by-turn BPMS at the Australian Synchrotron

Linear optics and coupling corrections applied to Sirius commissioning

Efficient modeling and mitigation of quadrupole errors in synchrotrons and their beam transfer lines

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