Insertion Devices at the National Synchrotron Light Source-II

Tanabe, T.; Cappadoro, Peter; Corwin, Todd; Fernandes, Huston; Harder, D.; Hidaka, Yoshiki; Kitégi, Charles; Musardo, Marco; Rank, J.

doi:10.1080/08940886.2015.1037682

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…Since the first in-vacuum undulator (IVU) was designed and operated in KEK [1] in the early 1990s, IVUs have been installed in various synchrotron radiation (SR) light sources around the world in order to expand the radiation spectrum to higher energies without the need to increase the beam energy [2][3][4][5][6][7][8]. In an IVU, the permanent magnet rows are inside a vacuum chamber, so the magnet gap is free from physical limitations and can be designed to be as small as possible.…”

Section: Introductionmentioning

confidence: 99%

Damping trapped modes in an in-vacuum undulator at a synchrotron radiation light source

Tian

Šebek

Ringwall

et al. 2019

Phys. Rev. Accel. Beams

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In-vacuum undulators have been widely operated in many synchrotron radiation facilities across the world. They usually are required to be operated at a smaller magnet gap than those of other undulators. Thus, operating challenges including impedance effects on the stored electron beam are introduced by these devices. In this paper, we report the efforts in solving the problem of coupled-bunch instabilities caused by an in-vacuum undulator in the SPEAR3 storage ring. Using beam based measurements, cold rf measurements, and numerical simulations, the source of the beam instabilities is characterized as trapped modes in the vacuum chamber. Using numerical models, we explored several approaches to reduce the strength of the trapped modes and found that ferrite dampers were the most effective and simplest way for mode damping in our SPEAR3 in-vacuum undulator. The results of the first rf cold measurement on an invacuum undulator equipped with these ferrite dampers agree well with numerical simulations.

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Section: Introductionmentioning

confidence: 99%

Damping trapped modes in an in-vacuum undulator at a synchrotron radiation light source

Tian

Šebek

Ringwall

et al. 2019

Phys. Rev. Accel. Beams

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“…The first IVU was developed and constructed for routine operation in the 6.5 GeV storage ring at KEK in 1991 [3]. Since then, hundreds of IVUs based on the KEK concept have been installed in various storage rings [4][5][6][7][8][9][10] across the world because IVUs allow shorter period lengths and a high field quality. They have become desirable photon sources of hard x rays for medium energy storage rings by utilizing higher harmonics of undulator radiation.…”

Section: Introductionmentioning

confidence: 99%

Challenges of in-vacuum and cryogenic permanent magnet undulator technologies

Huang

Kitamura

Yang

et al. 2017

Phys. Rev. Accel. Beams

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An in-vacuum undulator (IVU) provides a means to reach high-brilliance x rays in medium energy storage rings. The development of short period undulators with low phase errors creates the opportunity for an unprecedented brilliant light source in a storage ring. Since the spectral quality from cryogenic permanent magnet undulators (CPMUs) has surpassed that of IVUs, NdFeB or PrFeB CPMUs have been proposed for many new advanced storage rings to reach high brilliance x-ray photon beams. In a low emittance ring, not only the performance of the undulator but also the choice of the lattice functions are important design considerations. Optimum betatron functions and a zero-dispersion function shall be provided in the straight sections for IVU/CPMUs. In this paper, relevant factors and design issues for IVUs and CPMUs are discussed together with many technological challenges in short period undulators associated with beam induced-heat load, phase errors, and the deformation of support girders.

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“…The measurement results were shown in Ref. [3]. C5-IVU was realigned during the 2014-2015 year end shutdown as it was the only ID that degraded injection efficiency with the gap closed.…”

Section: Comparison With Beam Based Field Integral Measurementmentioning

confidence: 99%

“…At the time of this report 15 insertion devices have been installed in the storage ring and three are currently under commissioning. The basic parameters characterizing the NSLS-II IDs installed so far are listed in Ref [3]. The full form of the acronym for each beamline can be found in Ref [4].…”

Section: Introductionmentioning

confidence: 99%

Latest experiences and future plans on NSLS-II insertion devices

Tanabe¹,

Hidaka²,

Kitégi³

et al. 2016

AIP Conference Proceedings

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Abstract. National Synchrotron Light Source-II (NSLS-II) is the latest storage ring of 3 GeV energy at the Brookhaven National Laboratory (BNL). The horizontal emittance of the electron beam with the currently installed six damping wigglers is 0.9 nm.rad, which could be further reduced to 0.5 nm.rad with more insertion devices (IDs). With only one RF cavity the beam current is restricted to 200 mA. Five hundred mA operation is envisaged for next year with an addition of the second cavity. Six (plus two branches) beamlines have been commissioned in the initial phase of the project. In July 2015, three NIH funded beamlines called "Advanced Beamlines for Biological Investigations with Xrays" (ABBIX) will be added for operation. This paper describes the experiences of ID development, installation, and commissioning for the NSLS-II project as well as our future plans to improve the performance of the facility in terms of source development.

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Insertion Devices at the National Synchrotron Light Source-II

Cited by 8 publications

References 1 publication

Damping trapped modes in an in-vacuum undulator at a synchrotron radiation light source

Damping trapped modes in an in-vacuum undulator at a synchrotron radiation light source

Challenges of in-vacuum and cryogenic permanent magnet undulator technologies

Latest experiences and future plans on NSLS-II insertion devices

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