A general view of IDs to be installed at ALBA for second and third phase beam-lines

Campmany, J.; Nicolás, Josep; Juanhuix, Jordi; Marcos, Jordi; Massana, Valentí

doi:10.1063/1.4952800

Cited by 4 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract