New injection scheme using a pulsed quadrupole magnet in electron storage rings

Harada, Kentaro; Kobayashi, Yukinori; Miyajima, Tsukasa; Nagahashi, Shinya

doi:10.1103/physrevstab.10.123501

Cited by 23 publications

(14 citation statements)

References 2 publications

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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%

“…The stored beam passes the center of the PQM where the magnetic field is approximately zero while the injected bunch passes the PQM off center therefore receiving a dipole kick proportional to the offset from the magnetic center. The PQM injection scheme has been successfully designed and commissioned at the Photon Factory Advanced Ring (PF-AR) at KEK [11]. But PMI is not restricted to quadrupoles.…”

Section: Pulsed Multipole Injectionmentioning

confidence: 99%

“…A typical example for the driving circuit of such a pulser is given in Fig. 16 in [11]. This example shows a thyratron-based pulser.…”

Section: B Pulser Design and Timingmentioning

confidence: 99%

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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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Section: Conventional Injection and Its Limitationsmentioning

confidence: 99%

Section: Pulsed Multipole Injectionmentioning

confidence: 99%

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

Leemann

2012

Phys. Rev. ST Accel. Beams

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“…Intrigued by KEK's pioneering work on pulsed quadrupole (Harada et al, 2007) and pulsed sextupole injection (Takaki et al, 2010), it was recognized that a pulsed multipole had the potential to make top-up injection shots into the MAX IV storage rings transparent to users while allowing for a substantial reduction of complexity. Instead of four dipole kickers and their pulsers, only a single magnet and its pulser were required; the pulsed magnet could be aligned to the stored beam through beam-based measurements.…”

Section: Pulsed Multipole Injectionmentioning

confidence: 99%

The MAX IV storage ring project

et al. 2014

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The MAX IV facility, currently under construction in Lund, Sweden, features two electron storage rings operated at 3 GeV and 1.5 GeV and optimized for the hard X-ray and soft X-ray/VUV spectral ranges, respectively. A 3 GeV linear accelerator serves as a full-energy injector into both rings as well as a driver for a short-pulse facility, in which undulators produce X-ray pulses as short as 100 fs. The 3 GeV ring employs a multibend achromat (MBA) lattice to achieve, in a relatively short circumference of 528 m, a bare lattice emittance of 0.33 nm rad, which reduces to 0.2 nm rad as insertion devices are added. The engineering implementation of the MBA lattice raises several technological problems. The large number of strong magnets per achromat calls for a compact design featuring small-gap combined-function magnets grouped into cells and sharing a common iron yoke. The small apertures lead to a low-conductance vacuum chamber design that relies on the chamber itself as a distributed copper absorber for the heat deposited by synchrotron radiation, while non-evaporable getter (NEG) coating provides for reduced photodesorption yields and distributed pumping. Finally, a low main frequency (100 MHz) is chosen for the RF system yielding long bunches, which are further elongated by passively operated thirdharmonic Landau cavities, thus alleviating collective effects, both coherent (e.g. resistive wall instabilities) and incoherent (intrabeam scattering). In this paper, we focus on the MAX IV 3 GeV ring and present the lattice design as well as the engineering solutions to the challenges inherent to such a design. As the first realisation of a light source based on the MBA concept, the MAX IV 3 GeV ring offers an opportunity for validation of concepts that are likely to be essential ingredients of future diffraction-limited light sources.

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“…the magnetic end of the vertical injection septum, with an injection amplitude and angle ðx inj ,x 0 inj Þ in the horizontal plane defined by the stored beam. The injection invariant A inj of these bunches is then given by [9,10] At this point the dipole kicker kicks the particles by y ki thus reducing the angle…”

Section: Injection With a Single Dipole Kickermentioning

confidence: 99%

Injection with a single dipole kicker into the MAX IV storage rings

Leemann

2012

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tInjection into the two MAX IV storage rings will not make use of a 4-kicker local injection bump. Instead, pulsed multipole injection will be used for initial filling as well as top-up injection. Since commissioning a pulsed multipole magnet for injection into a storage ring is non-trivial, it has been decided to install a single dipole kicker magnet into the storage rings to provide a simple method for injection during early commissioning. Design studies have revealed that injection with a single dipole kicker into the MAX IV storage rings is not only efficient, but also allows for accumulation of beam. Although this accumulation cannot be made transparent to users (i.e. it is not compatible with user topup operation), it does provide a simple and robust injection method during commissioning. In addition, the dipole kicker can be used as a pinger magnet during machine studies with a single-bunch filling. This paper reports on the design studies performed for dipole kicker injection into the MAX IV storage rings and presents a summary of the expected performance of such an injection scheme.

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New injection scheme using a pulsed quadrupole magnet in electron storage rings

Cited by 23 publications

References 2 publications

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

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

The MAX IV storage ring project

Injection with a single dipole kicker into the MAX IV storage rings

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