Intra-beam scattering studies for low emittance at BAPS

田赛克,; 王九庆,; 徐刚,; 焦毅,; Tian, SK; Wang, JQ; Xu, Gang; Jiao, Yi

doi:10.1088/1674-1137/39/6/067001

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…In this study a multi-bend achromat (MBA) lattice was used, which can reach the hard X-ray diffraction-limited region with a small emittance. This kind of storage ring lattice could provide high-brightness synchrotron radiation at high repetition rates while holding a large percentage of coherent spatial fluxes, which is highly regarded by the synchrotron light community [9,17].…”

Section: Wakefield Characteristics Of the Lattice Elementsmentioning

confidence: 99%

Evaluation of beam coupling impedance by generating a dedicated database in an ultra-low emittance storage ring

Moniri,

Taherparvar

2024

J. Inst.

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The evaluation and accurate understanding of the cause of collective effects and the related instabilities using corrective measures, which may limit the achievable current per bunch, is significant for a prosperous design of charged particle accelerators. We describe in detail two dominant collective effects, i.e. space-charge and wakefield effects for a multi-bend achromat (MBA) storage ring lattice under design. We have developed a detailed impedance model, which is used to study the beam dynamics, including the wakefield effects. The beam coupling impedances due to the wakefields were calculated to construct a coupling impedance database, with the wakefields of each vacuum component being maintained in a standard format. The Self-Describing Data Sets (SDDS) toolkit was used to calculate the wake potentials for all coupling impedance contributing vacuum components, to be used for an ultra-low emittance lattice design. The ELEGANT code was utilized for the particle tracking in an element-by-element procedure along the lattice. A bunch with the Gaussian distribution was assumed to calculate the model for a distributed resistive-wall impedance and the impedance generated by geometrical discontinuities for the various accelerator elements. Moreover, we evaluated the potential-well distortion effect due to longitudinal phase space motion for a system of electron bunches. The collective effects in multi-particle systems have been evaluated for the estimation of the beam instability with more accurate results, defined by their sources in the designed lattice and describing their effects on beam instabilities with remarkable consequences like energy loss and betatron tune shift.

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Section: Wakefield Characteristics Of the Lattice Elementsmentioning

confidence: 99%

Evaluation of beam coupling impedance by generating a dedicated database in an ultra-low emittance storage ring

Moniri,

Taherparvar

2024

J. Inst.

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“…HEPS is a kilometer-scale, 5-6 GeV, ultralowemittance storage ring-based light source, planned to be built in Beijing. Various lattice designs and relevant studies have been performed for HEPS since 2010 [9][10][13][14][15][16][17][18][19][20]. Since HEPS is a new machine, it has great flexibility in the choice of the ring parameters, e.g., the circumference.…”

Section: Introductionmentioning

confidence: 99%

ESRF-type lattice design and optimization for the High Energy Photon Source

Jiao

Peng

2016

Chinese Phys. C

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A new generation of storage ring-based light sources, called diffraction-limited storage rings (DLSRs), with emittance approaching the diffraction limit for multi-keV photons by means of multi-bend achromat lattices, has attracted extensive studies worldwide. Among various DLSR proposals, the hybrid multi-bend achromat concept developed at the European Synchrotron Radiation Facility (ESRF) predicts an effective way of minimizing the emittance while keeping the required chromatic sextupole strengths to an achievable level. For the High Energy Photon Source planned to be built in Beijing, an ESRF-type lattice design consisting of 48 hybrid seven-bend achromats is proposed to reach emittance as low as 60 pm•rad with a circumference of about 1296 m. Sufficient dynamic aperture, allowing vertical on-axis injection, and moderate momentum acceptance are achieved simultaneously for a promising ring performance.

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“…A kilometer-scale DLSR with the beam energy of 5 to 6 GeV, named High Energy Photon Source (HEPS), was proposed to be built in Beijing [5]. Extensive efforts have been made on the lattice design and relevant studies for this project [6][7][8][9][10][11][12][13][14]. Recently the 'baseline design' of the HEPS was developed [15] based on the concept of 'hybrid MBA' [16].The ring consists of 48 identical hybrid seven-bend achromats (7BAs), with a horizontal natural emittance of 60 pmrad and a circumference of 1.3 kilometers.…”

Section: Introductionmentioning

confidence: 99%

“…A kilometer-scale DLSR with beam energy of 5 to 6 GeV, named the High Energy Photon Source (HEPS), has been proposed to be built in Beijing [5]. Extensive efforts have been made on the lattice design and relevant studies of this project [6][7][8][9][10][11][12][13][14]. Recently the HEPS 'baseline design' was developed [15] based on the concept of a 'hybrid MBA' [16].…”

Section: Introductionmentioning

confidence: 99%

Improving nonlinear performance of the HEPS baseline design with a genetic algorithm

Jiao

2016

Chinese Phys. C

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The baseline design for the High Energy Photon Source has been proposed, with an emittance of 60 pmrad within a circumference of 1.3 kilometers. Nevertheless, the nonlinear performance of the design needs further improvements to enlarge both the dynamic aperture and the momentum acceptance. In this study, genetic optimization of the linear optics is performed, so as to find all the possible solutions with weaker sextupoles and hence weaker nonlinearities, while keeping the emittance at the same level as the baseline design. These obtained solutions enable us to explore the dependence of nonlinear dynamics on the working point. The result indicates that with the same layout, it is feasible to obtain much better nonlinear performance with a delicate tuning of the magnetic field strengths and a wise choice of the working point.

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Intra-beam scattering studies for low emittance at BAPS

Cited by 9 publications

References 6 publications

Evaluation of beam coupling impedance by generating a dedicated database in an ultra-low emittance storage ring

Evaluation of beam coupling impedance by generating a dedicated database in an ultra-low emittance storage ring

ESRF-type lattice design and optimization for the High Energy Photon Source

Improving nonlinear performance of the HEPS baseline design with a genetic algorithm

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