An overview of the insertion device development at SRRC

Hwang, Ching-Shiang; Chang, Chin-Chun; Fan, T.C.; Ch, Wang; Chen, J.R.; Chen, C.T.

doi:10.1016/s0168-9002(01)00241-8

Cited by 16 publications

(4 citation statements)

References 4 publications

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“…However, the variation of on-axis integral field of the hybrid structure is, however, larger than for the pure structure when the magnet gap or phase is altered [7]. The multipole field error can be corrected with the magic-finger scheme [10], [11] in fixed magnet gap, but the error can be compensated with a multipole corrector at the down-stream of the EPU location when energy is in the dynamic tuning.…”

Section: Design Of the End Polementioning

confidence: 99%

Design and Performance of a New Magnetized Magnet Block on EPU Structure

Hwang

Chang

Lin

et al. 2008

IEEE Trans. Appl. Supercond.

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A prototype of an Apple-II elliptically polarized undulator (EPU4.6), of length 0.46 m, has been constructed to test the performance of the newly designed magnet block, which was magnetized at a tilt angle 10 . The magnet design and various mechanism analysis are performed to clarify the error source of multipole field components. Good end pole design in the EPU4.6 revealed the variation of the first integral field strength as function of gap and phase is minimized. Shimming algorithm had been used to improve the field quality and phase error. We report here the scheme of the magnetized block arrangement, an analysis of the design mechanism, the end pole design, field shimming and the final test performance using the Hall-probe mapping system.Index Terms-APPLE-II, elliptically polarized undulator, end pole design, magnetic field measurement.

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Section: Design Of the End Polementioning

confidence: 99%

Design and Performance of a New Magnetized Magnet Block on EPU Structure

Hwang

Chang

Lin

et al. 2008

IEEE Trans. Appl. Supercond.

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“…Both two EPUs are designed with the Apple-II structure which consists of four standard "Halbach-type" permanent magnet arrays with two above and two below the electron orbit [2]. The material of magnet blocks is NdFeB with the grade N38SH and the remanance .…”

Section: Magnet Designmentioning

confidence: 99%

The Design of a Pair of Elliptically Polarized Undulators at SSRF

Zhou

Zhang

2012

IEEE Trans. Appl. Supercond.

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The magnetic design of a pair of elliptically polarized undulators with APPLE-II type which will be used in a soft X-ray beam line for ARPES and PEEM at SSRF is presented. The undulators will cover the energy range from 20 eV to 2000 eV of arbitrary polarized light including the horizontal, vertical, elliptical and circular polarization. The quasi-periodic design to minimize the contributions of the higher harmonics of the low energy undulator is also described.

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“…Although the Apple-II EPU has the greatest rates of polarization and the maximum magnetic-flux density in the horizontal field, the field roll-off of the two transverse field components declines rapidly, adversely affecting the top-up injection and dynamic aperture. For this reason the vertical field (B y ) rolloff was improved with either a thin shim at the edge of the magnet block [56] or an optimal angle of magnetization with respect to the vertical axis [57] of the magnet block. Figure 4 displays the mechanisms by which those two solutions decelerate the rapid decline of field roll-off; Fig.…”

Section: Out-of-vacuum Insertion Devicesmentioning

confidence: 99%

“…Neither method can improve the field roll-off of the horizontal field (B x ). The integral multipole components of the two transverse fields can also be corrected using a magic finger [56]. Apple-II undulators produce strong dynamic multipoles in the elliptical and inclined mode, which can significantly decrease the electron-beam lifetime and dynamic aperture.…”

Section: Out-of-vacuum Insertion Devicesmentioning

confidence: 99%

Development trends for insertion devices of future synchrotron light sources

Hwang

Jan

Chang

et al. 2011

Phys. Rev. ST Accel. Beams

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The in-vacuum undulator with a permanent magnet at room temperature is a mature technology and is widely used; with a short period length in a medium-energy facility, it can enhance photon brilliance in the hard x-ray region. A cryogenic permanent magnet has been investigated as an in-vacuum undulator; this undulator will become the best prospective device to satisfy the requirements of a photon source with great brilliance in the hard x-ray region. For the further hard x-ray region, a superconducting wiggler can provide great flux with a continuous spectrum, whereas a superconducting undulator will provide great brilliance with a discrete spectrum. High-temperature superconducting wires are highly promising for use in the development of superconducting undulators; unique algorithms for their development with an extremely short period in a small-magnet gap have been devised. Some out-of-vacuum planar undulators with special functions must also be fabricated to enable diverse applications in various light-source facilities. This article describes current and future developments for insertion devices in storage-ring and free-electron-laser facilities and discusses their feasibility for use therein.

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An overview of the insertion device development at SRRC

Cited by 16 publications

References 4 publications

Design and Performance of a New Magnetized Magnet Block on EPU Structure

Design and Performance of a New Magnetized Magnet Block on EPU Structure

The Design of a Pair of Elliptically Polarized Undulators at SSRF

Development trends for insertion devices of future synchrotron light sources

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