Vibrating wire field-measuring technique

Temnykh, A.

doi:10.1109/pac.1997.753160

Cited by 10 publications

(15 citation statements)

References 2 publications

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“…However, to find the position of their magnetic axis, the ESR 2.1 puts into practice the vibrating wire technique [1,[9][10][11][12][13]: a measurement is performed with a tension applied to the wire while a current is going through it. Responding to the Lorentz law, the wire vibrates; the amplitude and the phase of the vibration indicate the magnetic field in the measured area and the measurement is repeated with different tensions.…”

Section: Magnetic and Mechanical Propertiesmentioning

confidence: 99%

Characterisation and Measurement to the Sub-Micron Scale of a Reference Wire Position

Sanz

Chérif

Durand

et al. 2015

17th International Congress of Metrology

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Résumé. L'étude suivante est réalisée dans le cadre du projet PACMAN (a study on Particle Accelerator Components Metrology and Alignment to the Nanometre scale) : une étude sur la métrologie et l'alignement à l'échelle nanométrique des composants d'un accélérateur de particules. C'est un programme Marie Curie supporté par la Commission Européenne et hébergé par le CERN. Le but de ce programme est de faire travailler en équipe de jeunes chercheurs sur le développement d'un banc de pré-alignement pour l'accélérateur linéaire CLIC (Compact Linear Collider). Sur ce banc, chaque composant sera aligné au niveau requis en une seule opération basée sur l'utilisation d'un fil tendu. Pendant cette opération, le fil matérialisera les axes magnétiques et électriques des composants, c'est-à-dire qu'il sera à la position théorique du faisceau de particules. Puis il servira de référence et la position de son axe sera mesurée avec autant de précision que possible par une machine de mesure tridimensionnelle. La recherche présentée dans ce papier est en deux parties : la première vise à présenter les propriétés du fil nécessaires au projet qui ont été mesurées, tandis que différents capteurs potentiels pour le banc final se trouvent dans la seconde.

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Section: Magnetic and Mechanical Propertiesmentioning

confidence: 99%

Characterisation and Measurement to the Sub-Micron Scale of a Reference Wire Position

Sanz

Chérif

Durand

et al. 2015

17th International Congress of Metrology

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“…A Vibrating Wire (VW) technique [8] was developed and tested on the prototype. Compared to the Moving Wire (MW) method, the VW gives more accurate results, chiefly because it is able to reduce systematic errors caused by the proximity of the stages to the magnet ends.…”

Section: A Alignmentmentioning

confidence: 99%

Certification of Superconducting Solenoid-Based Focusing Lenses

Di-Marco

Hemmati

Orris

et al. 2011

IEEE Trans. Appl. Supercond.

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Abstract-The first production focusing lens for the HINS beam line at Fermilab has been assembled into a cryostat and tested. A total of 5 devices will be tested before they are installed in the low energy section of the HINS beam line, which uses copper Crossbar-H (CH) style RF cavities. One of the tested CHsection lens assemblies includes a pair of weak orthogonal steering dipoles nested within a strong focusing solenoid, and has six vapor cooled power leads. The other device has only the strong focusing solenoid, and utilizes a single pair of HTS power leads. The production test program is designed to measure the thermal performance of the cryostat, minimum cooling requirements for the HTS leads, quench performance of all superconducting components, and precise determination of the magnetic axis and field angles. Results and future plans for the first production device tests are presented.

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“…Quadrupolos e sextupolos que fazem parte de um mesmo trecho reto entre dipolos possuem especificações de alinhamento com 30 µm rms entre eles [3]. Justamente com a finalidade de realizar um alinhamento preciso entre esses magnetos, está sendo construída no LNLS uma bancada baseada na técnica do fio vibrante por corrente alternada, descrita em [5]. Não existe, entretanto, um consenso sobre a técnica mais precisa para esse fim, e outros aceleradores utilizam ou já utilizaram técnicas diferentes, como: bobina girante, fio pulsado, e fio vibrante por ondas de rádio [6].…”

Section: Introductionunclassified

Estudo de Sistema de Alinhamento de Magnetos para o Projeto Sirius a partir de Técnica Difratométrica

Geraldes

Citadini

Sá

2013

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Resumo: O presente trabalho faz uma avaliação da técnica de localização espacial de um anteparo com abertura circular a partir da análise do padrão de difração de um laser em uma CCD. Com isso, busca-se qualificar uma alternativa complementar à técnica adotada atualmente, isto é, ao sistema de fio vibrante, para os procedimentos de alinhamento dos ímãs da rede magnética do anel armazenador de elétrons do Projeto Sirius. Às imagens de interesse, são aplicados quatro métodos de processamento distintos, a saber: o cálculo de centro de massa da imagem em tons de cinza; o cálculo de centro de massa da imagem binarizada; o ajuste de uma circunferência ao contorno da imagem binarizada; e o ajuste da imagem em tons de cinza ao padrão teórico. As análises são feitas tanto em conjuntos de imagens reais, obtidas a partir de dois elementos difratantes, um pinhole e um diafragma íris, como também em imagens simuladas, a fim de confrontar os métodos quando aplicados a dados seguramente conhecidos. Os resultados obtidos sugerem que a técnica atende às tolerâncias exigidas na aplicação, e números finais de precisão e acurácia podem ser determinados no futuro próximo com um aperfeiçoamento das condições experimentais. Palavras-chave: processamento de imagem, alinhamento, padrão de difração.Abstract: It is made an evaluation of the technique for finding the position of a circular aperture after the diffraction pattern of a laser in a CCD. It is sought an alternative to complement the vibrating wire technique, which is going to be used for the alignment of the magnets in the magnetic lattice of the Sirius Project. Four different image processing methods are used to study the images of interest: the calculation of the center of mass of the grayscale image; the calculation of the center of mass of the binarized image; the fitting of a circle to the contour of the binarized image; and the fitting of the theoretical intensity function to the grayscale image. The analyses are carried out for real images, captured with two different types of apertures, a pinhole and an iris diaphragm, as well as for simulated images, in order to compare the methods when applied to known data. The results suggest that the technique meets the tolerances required in the application. Final figures of precision and accuracy may be obtained in the near future with some improvement of the experimental setup.

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Vibrating wire field-measuring technique

Cited by 10 publications

References 2 publications

Characterisation and Measurement to the Sub-Micron Scale of a Reference Wire Position

Characterisation and Measurement to the Sub-Micron Scale of a Reference Wire Position

Certification of Superconducting Solenoid-Based Focusing Lenses

Estudo de Sistema de Alinhamento de Magnetos para o Projeto Sirius a partir de Técnica Difratométrica

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