Impedance modeling and its application to the analysis of the collective effects

Blednykh, Alexei; Bassi, Gabriele; Smaluk, Victor; Lindberg, Ryan

doi:10.1103/physrevaccelbeams.24.104801

Cited by 9 publications

(9 citation statements)

References 26 publications

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“…This work will also serve as a record for cross-checking with future beam-based measurements in ALS-U. It is hoped that this documentation will benefit recently started upgrade projects and those that may come in the future [10].…”

Section: Introductionmentioning

confidence: 91%

“…Except for transitions in beampipe radius, which are simulated in pairs, wake fields of components are calculated individually; cross-talk between elements is not an issue for resistive wall, and other contributions are dominated by localized modes. As described in [10], cross-talk may noticeably impact dynamics for 4th generation light sources, but these corrections can be ne-glected for the purpose of ensuring that the beam parameters are far from any instabilities.…”

Section: Introductionmentioning

confidence: 99%

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Broadband impedance modeling and single bunch instabilities estimations of the advanced light source upgrade project

Wang

Bane

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Broadband impedance modeling and single bunch instabilities estimations of the advanced light source upgrade project

Wang

Bane

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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“…However, in the numerical wakefield simulations, only the wake potential can be obtained. So that for accurate calculations of the beam-impedance interaction, a wake potential calculated with a 5-10 times shorter model bunch than the real beam should be used [15,16]. Another way is to calculate the interaction in the frequency domain with the bunch spectrum.…”

Section: Jinst 18 P12003mentioning

confidence: 99%

Impedance of in-air undulator vacuum chamber in HEPS

Li,

Wang,

Yue

et al. 2023

J. Inst.

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Undulators with small gap have been widely used in various light sources all over the world for the demand of high brilliance. A large number of in-air undulators with small gap will be installed in the storage ring of the High Energy Photon Source, and become one of the important impedance contributors. Antechambers are adopted for the bypass of the synchrotron radiations, as well as to reach high vacuum in the beam pipe with small aperture. Due to the asymmetric structure of the vacuum chamber, monopole wakefield in the transverse planes will be excited by the beam passage. In addition, photon absorbers will be installed in the vacuum chamber of the in-air undulators to shield the downstream components, which will introduce extra resonances in the transverse planes. In this paper, a series of numerical simulations are performed to investigate the impedance of the in-air undulator vacuum chamber. The high order modes generated by the photon absorber and their mitigations are also investigated.

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“…A larger r b induces a higher signal level and lower position resolution; a larger t b induces a lower wakefield impedance and lower position resolution; and a larger g b induces a higher position resolution and higher wakefield impedance [40]. The wakefield impedance of the BPM must be examined in detail, and a compromise must be made between the two contradicting requirements [13,18,[41][42][43].…”

Section: Wakefield Impedancementioning

confidence: 99%

“…The bunch spacing for the stripline is much larger than that for the buttons, and the wakefield restrictions are also more relaxed. We checked the wakefield impedance using the CST wakefield solver and Lambertson formalism [42,45]. The stripline longitudinal beam impedance at a low frequency can be evaluated by…”

Section: Wakefield Impedancementioning

confidence: 99%

Beam position monitor design for the High Energy Photon Source

Sui

et al. 2022

Meas. Sci. Technol.

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A button and stripline beam position monitor (BPM) were designed and developed to achieve sub-micron orbit stability in the High Energy Photon Source (HEPS). Analytical formulae and CST electromagnetic simulation software were used to calculate the radio frequency characteristics of the BPM. The BPM design procedure was developed according to the HEPS requirements. The characteristic impedances of the stripline were designed to be 50 Ω and confirmed by measurements. The position sensitivity, position resolution, capacitance, and wakefield impedance of the button BPM were calculated. The measurement results confirmed that the design satisfied the HEPS requirements.

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Impedance modeling and its application to the analysis of the collective effects

Cited by 9 publications

References 26 publications

Broadband impedance modeling and single bunch instabilities estimations of the advanced light source upgrade project

Broadband impedance modeling and single bunch instabilities estimations of the advanced light source upgrade project

Impedance of in-air undulator vacuum chamber in HEPS

Beam position monitor design for the High Energy Photon Source

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