Beam injection with a pulsed sextupole magnet in an electron storage ring

Takaki, H.; Nakamura, Norio; Kobayashi, Yukinori; Harada, Kentaro; Miyajima, Tsukasa; Ueda, Akira; Nagahashi, Shinya; Shimada, Miho; Obina, T.; Honda, Tohru

doi:10.1103/physrevstab.13.020705

Cited by 39 publications

(24 citation statements)

References 2 publications

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“…The stability of the photon beam intensity was achieved by the top-up operation of the Photon Factory facility that has been available in the recent operation [44]. Since the instability of the energy of the photon beam at a narrow photon bandwidth causes fluctuation in the electron-beam intensity, we have used a lower resolution of about 4 meV for the photon beam during the measurement.…”

Section: Methodsmentioning

confidence: 99%

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

et al. 2011

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Absolute total cross sections for electron scattering from Ar and Xe at electron energies ranging from 7 meV to 20 eV were obtained with the experimental technique employing the threshold-photoelectron source. The measured total cross sections are in good agreement with those obtained by other groups down to 100 meV, above which several experimental works have been reported. Scattering lengths for electron scattering from Ar, Kr, and Xe were determined from the present total cross sections and our recent results for Kr using the modified effective range theory. The values of the scattering length obtained in the present analysis differ from the values determined from the previous swarm experiments and beam experiments. The resonant structures in the total cross sections due to Feshbach resonances of Ar, Kr, and Xe with an improved energy resolution were also measured. Analyses of the resonant structure were carried out based on the spin-dependent resonant scattering theory in order to determine the values of the natural width of Feshbach resonances of Ar, Kr, and Xe precisely.

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Section: Methodsmentioning

confidence: 99%

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

et al. 2011

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“…Furthermore, as stability criteria become tougher in newer storage ring designs, this method of injection becomes less favorable. Therefore, several labs have started investigating alternative injection schemes [11][12][13][14][15].…”

Section: Conventional Injection and Its Limitationsmentioning

confidence: 99%

“…But PMI is not restricted to quadrupoles. In fact, there are advantages to using higher-order multipole magnets, for example a pulsed sextupole magnet (PSM) [15]. Around the magnet center, the PSM field is symmetric and flat: for a specific amplitude of the injected bunch at the PSM, x pm , the residual kick to a particle within the stored beam (at a small amplitude x) is reduced by a factor x=x pm compared to the residual kick from a PQM.…”

Section: Pulsed Multipole Injectionmentioning

confidence: 99%

Pulsed sextupole injection for Sweden’s new light source MAX IV

Leemann

2012

Phys. Rev. ST Accel. Beams

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The MAX IV facility presently under construction will include two storage rings for the production of synchrotron radiation. Both rings will be operated at a constant 500 mA of stored current with top-up shots supplied by the MAX IV linac acting as a full-energy injector. Until recently, injection into both storage rings was designed using a conventional approach: a closed four-kicker injection bump brings the stored beam to the septum blade where the injected bunches are captured in a single turn. This method, although commonly found in third generation light sources, has significant disadvantages. Therefore, an alternative injection into the storage rings using pulsed multipoles has been investigated. This type of injection does not require an injection bump and has the potential to make top-up injection fully transparent to users. Design studies have been successfully completed and as a consequence it has been decided to replace the originally foreseen conventional injection scheme with pulsed multipole injection in both MAX IV storage rings. This paper reports on these studies, presents pulsed sextupole injection schemes, and summarizes requirements for the pulsers, sextupole magnets, and vacuum chambers.

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“…An injection scheme utilizing multipole kicker and avoiding the inclusion of a kicker bump has been proposed and experimentally examined [4]. The injected bunch passes through a pulsed multipole magnet with an offset from its center while the circulating bunches pass through the center.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal injection scheme using short pulse kicker for small aperture electron storage rings

Aiba

Böge

Marcellini

et al. 2015

Phys. Rev. ST Accel. Beams

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Future light sources aim at achieving a diffraction limited photon beam both in the horizontal and vertical planes. High gradient quadrupoles and strong chromaticity correction sextupoles in a corresponding ultra-low emittance ring may restrict the physical and dynamic aperture of the storage ring such that offaxis injection and accumulation may become impossible. We propose a longitudinal injection scheme, i.e., injecting an electron bunch onto the closed orbit with a time offset with respect to the circulating bunches. The temporal separation enables a pulsed dipole kicker to situate the injected bunch transversely on-axis without disturbing the circulating bunches if the pulse length is shorter than the bunch spacing. The injected bunch is finally merged to a circulating bunch through synchrotron radiation damping. We present the scheme in detail and its application to the lattice of the MAX IV 3 GeV storage ring. The requirements and feasibility of the pulsed dipole kicker are also discussed.

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Beam injection with a pulsed sextupole magnet in an electron storage ring

Cited by 39 publications

References 2 publications

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

Pulsed sextupole injection for Sweden’s new light source MAX IV

Longitudinal injection scheme using short pulse kicker for small aperture electron storage rings

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