Transverse multibunch bursting instability in the APS storage ring

Harkay, K.; Sajaev, V.; Yang, Bingxin

doi:10.1109/pac.2007.4440009

Cited by 4 publications

(8 citation statements)

References 2 publications

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AbstractIn recent years we have explored the application to the Advanced Photon Source (APS) of Zholents' crab-cavitybased scheme for production of short x-ray pulses [1]. As a near-term project, the APS has elected to pursue a pulsed system using room-temperature cavities [2].

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mentioning

confidence: 99%

The wakefield effects of pulsed crab cavities at the Advanced Photon Source for short-x-ray pulse generation

Chae

Waldschmidt

Dolgashev

2007

2007 IEEE Particle Accelerator Conference (PAC)

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In recent years we have explored the application to the Advanced Photon Source (APS) of Zholents' crab-cavitybased scheme for production of short x-ray pulses [1]. As a near-term project, the APS has elected to pursue a pulsed system using room-temperature cavities [2]. The cavity design has been optimized to heavily damp parasitic modes while maintaining large shunt impedance for the deflecting dipole mode [3]. We evaluated a system consisting of three crab cavities as an impedance source and determined their effect on the single-and multi-bunch instabilities. In the single-bunch instability we used the APS impedance model as the reference system in order to predict the overall performance of the ring when the crab cavities are installed in the future. For multi-bunch instabilities we used a realistic fill pattern, including hybrid-fill, and tracked multiple bunches where each bunch was treated as soft in distribution.

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mentioning

confidence: 99%

The wakefield effects of pulsed crab cavities at the Advanced Photon Source for short-x-ray pulse generation

Chae

Waldschmidt

Dolgashev

2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…At low, positive ξ y (ξ x ), the transverse modecoupling instability (TMCI) determines the intensity limit of 2 mA (4.5 mA) [1], as also indicated in Fig. 4.…”

Section: Single-bunch Intensity Limitmentioning

confidence: 66%

“…The bunch-intensity limits, however, change in both cases. Prior studies indicate that the instability growth rate is inversely proportional to ξ x [1]. Consequently, at a fixed I b , the bursting period decreases and the saturation amplitude increases when ξ x is reduced (not shown).…”

Section: Chromaticity Dependencementioning

confidence: 78%

“…total resistive wall impedance is on the order of 0.1 MΩ/m in both planes, comparable to the horizontal broadband resonator (BBR) model but much less than the vertical BBR used in Ref. [1]. A local bump method [7] was used to distinguish these two types of impedance experimentally.…”

Section: Impedance Modelingmentioning

confidence: 91%

“…and 18.5 8-mm-gap v.c., a maximum single-bunch intensity of 11 mA has been achieved. Well below the intensity limit and above the mode-coupling threshold, a transverse single-bunch sawtooth instability is observed [1]. In electron storage rings, sawtooth instabilities have long been observed longitudinally.…”

Section: Introductionmentioning

confidence: 99%

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Transverse sawtooth instability at the Advanced Photon Source

Harkay

Huang²,

Lessner³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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A detailed investigation has been made of the transverse sawtooth instability observed at the Advanced Photon Source. This horizontal single-bunch instability exhibits two modes: steady-state, with continuous centroid oscillations at fixed amplitude, and bursting, with an amplitude that varies quasi-periodically with a peak-topeak excursion of up to 2 mm. The transition between modes is sharp and, depending on machine conditions, multiple transitions are observed with increasing bunch intensity. The threshold and character of the instability also vary with chromaticity and rf voltage. The horizontal instability shows striking similarities to the longitudinal sawtooth instability observed in the Stanford Linear Collider damping ring, as well as clear and obvious differences. This paper presents experimental results and a possible mechanism for the sawtooth instability that is suggested by simulations.

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