Physical and optical properties of rare earth cobalt magnets

Halbach, K.

doi:10.1016/0029-554x(81)90477-8

Cited by 345 publications

(134 citation statements)

References 2 publications

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“…For the construction of short period length undulators, different techniques have to be considered [9] starting with the well-established Halbach design [14]. In this pure permanent magnet (PPM) design, the field of the alternating magnet poles is closed by additional magnets rotated by 90 , similar to the case of the PPM quadrupoles, discussed in the next section.…”

Section: A Design and Manufacturingmentioning

confidence: 99%

Miniature magnetic devices for laser-based, table-top free-electron lasers

Eichner

Grüner

Becker

et al. 2007

Phys. Rev. ST Accel. Beams

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Truly table-top sized radiation sources based on compact laser-plasma accelerators require compact and strong focusing devices and efficient short-period undulators. Complementing our recent theoretical work on the feasibility of a table-top FEL, we here present the design and successful experimental characterizations of a 5 mm period length undulator and miniature quadrupole magnets with field gradients of the order of 500 T=m.

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Section: A Design and Manufacturingmentioning

confidence: 99%

Miniature magnetic devices for laser-based, table-top free-electron lasers

Eichner

Grüner

Becker

et al. 2007

Phys. Rev. ST Accel. Beams

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“…Either a large number of weak-field poles or a smaller number of strong-field poles can be used. The model used to determine the relationship between the on-axis field and the gap-to-period ratio is that for a hybrid structure with vanadium permendur pole pieces and NdFeB magnets [8]. The result of changing the number of poles in our fixed-length wiggler, with a machine electron energy of 1.5 GeV and an observation wavelength of 1 A, is shown in Fig.…”

Section: Optimization ~F the Wiggler Sourcementioning

confidence: 99%

A beamline for macromolecular crystallography at the Advanced Light Source

Padmore

Earnest

Kim

et al. 1995

Review of Scientific Instruments

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A beamline for macromolecular crystallography has been designed for the ALS. The source will be a 37-pole wiggler with a 2-T on-axis peak field. The wiggler will illuminate three beamlines, each accepting 3 mrad of horizontal aperture. The central beamline will primarily be used for multiple-wavelength anomalous dispersion measurements in the wavelength range from 4 to 0.9 Å. The beamline optics will comprise a double-crystal monochromator with a collimating premirror and a double-focusing mirror after the monochromator. The two side stations will be used for fixed-wavelength experiments within the wavelength range from 1.5 to 0.95 Å. The optics will consist of a conventional vertically focusing cylindrical mirror followed by an asymmetrically cut curved-crystal monochromator. This paper presents details of the optimization of the wiggler source for crystallography, gives a description of the beamline configuration, and discusses the reasons for the choices made.

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“…Quadrupole and dipole fields are assembled from sector-shaped REC blocks arrayed in a circle around the magnet aperture [Halbach, 1981]. Each block is magnetized in an appropriate direction so that the magnetic field varies approximately as cos NO around the bore, where N = 1 for dipoles, N = 2 for quadrupoles, etc.…”

Section: Interaction Region Magnets and Supportsmentioning

confidence: 99%

An Asymmetric B-Factory Based on PEP

Oddone¹

1989

Ann NY Acad Sci

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OVERVIEWIT has become increasingly apparent in recent years that systems containing b quarks offer unique opportunities for studying the theoretical edifice of particle physics, the so-called "Standard Model." Although measurements with these b-quark systems offer a host of possibilities, the one that has riveted the attention of the particle physics community worldwide is the potential for understanding the origin of the phenomenon of CP violation-a small deviation in Nature's otherwise symmetric order that has been clearly observed but whose origins remain a mystery. The phenomenon of CP violation has cosmic consequences; in particular, it played a crucial role in the formation of our Universe. Thus, to understand it is one of the central goals in our quest to comprehend the orderly foundations of the natural world. The program of CP violation studies that we envision has great discovery potential; should the measurements disagree with predictions of the Standard Model, the observed pattern of CP violation will provide substantial and specific clues as to how the model should be extended.Capitalizing on recent advances in detector technology and newly acquired information on the properties of the b quark, it is r«jw widely accepted that a highluminosity, asymmetric e + e _ collider offers an ideal platform for an exhaustive study of CP violation. This fact was forcefully endorsed last year by HEPAP through the deliberations and recommendations of its subpanel on the U.S. High Energy Physics Research Program for the 1990s (the Sciulli panel, DOE/ER-0453P and the accompanying transmittal letter, April 1990). The thrust of HEPAP's recommendations was that the physics program of a B factory was compelling and that, given a technically sound proposal fof construction of a machine, funds for such a facility should be sought with high priority.While CP violation is the main motivation for the construction of a B factory, such a facility will also host a very exciting and broad-based program of bottom q,uark t charm quark, T, and two-photon physics. Important tests of the Standard Model are possible in this program and many gaps in our knowledge are sure to be filled in. Because the number and range of distinct topics is very large, an asymmetric B factory will be an ideal facility for the training of young physicists, and we envisage more than 200 Ph.D. theses during the lifetime of the program (conservatively estimated at 15 years). The specific machine implementation discussed heie has a single interaction region, though flexibility exists to expand this to two interaction regions, and therefore two detectors, should the user community consider this important enough to provide the extra funds. A OVERVIEW parasitic program of synchrotron radiation physics and nuclear physics would also be possible with additional funds.A very large international particle physics community is committed to physics studies at an asymmetric e + e-B factory. A group of physicists numbering more than 150 Ph.D.'s h?s been involved with the...

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Physical and optical properties of rare earth cobalt magnets

Cited by 345 publications

References 2 publications

Miniature magnetic devices for laser-based, table-top free-electron lasers

Miniature magnetic devices for laser-based, table-top free-electron lasers

A beamline for macromolecular crystallography at the Advanced Light Source

An Asymmetric B-Factory Based on PEP

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