Bunch by Bunch Position Measurement and Analysis at PLS-II

Lee, Jaeyu; Chun, M.H.; Hwang, Ilmoon; Kim, Do Tae; Kim, Gyu-Jin; Lee, Tae-Yeon; Dong-cheol, Shin，; Shin, Seunghwan

doi:10.18429/jacow-ipac2016-mopmr002

Cited by 2 publications

(3 citation statements)

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“…Generally, the transverse dipolar oscillations are studied by analyzing the signals from the Beam Position Monitor (BPM) electrodes on the time scale of bunch-by-bunch and calculates the transverse positions of each bunch by Δ/Σ algorithm, consequently obtaining the transverse dipolar oscillations of each bunch in the storage ring [8,9]. However, since the quadrupole signal component from the BPM…”

Section: Introductionmentioning

confidence: 99%

A computing module for speeding up the bunch-by-bunch measurement of transverse positions and transverse profiles within injection period

Wu,

Wang,

et al. 2024

J. Inst.

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The Multi-Bend-Achromat (MBA) structure of the Diffraction-limited Synchrotron Light Source (DLSR) makes the dynamic range of its injection significantly smaller, thus posing a more demanding challenge for the stable injection of beams. To investigate the possible instabilities during the injection process, multi-anode photomultiplier tubes (MAPMT) are used in bunch-by-bunch measurements to obtain the transverse positions and transverse profiles of the bunched beams as they are injected. However, the data processing time witnessed in prior measurements posed a significant challenge in obtaining this information in time, thus failing to meet the stringent demands of online measurements. Consequently, this paper proposes one computing module, engineered to enhance the speed of bunch-by-bunch measurements of transverse positions and profiles. This solution is capable of delivering measurement results for each bunch in the filling pattern, all within the specified injection period.

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Section: Introductionmentioning

confidence: 99%

A computing module for speeding up the bunch-by-bunch measurement of transverse positions and transverse profiles within injection period

Wu,

Wang,

et al. 2024

J. Inst.

View full text Add to dashboard Cite

show abstract

“…The third technique entails utilizing a high-sampling-rate oscilloscope to capture signals from four distinct channels. Subsequently, curve fitting techniques are applied to identify signal peaks [7][8][9], culminating in the calculation of the position. Importantly, this method commands significant computing resources; however, it yields optimal results, particularly in scenarios marked by substantial variations in the bunch phase.…”

Section: Introductionmentioning

confidence: 99%

“…Within the domain BbB monitoring system, a substantial volume of data is employed to characterize the motion of the bunches. Principal component analysis (PCA) or mode-independent analysis [10,11] employs an orthogonal transformation to linearly convert observed values, followed by projecting these values onto linearly uncorrelated components [9,12]. Nonetheless, in cases where the sources are intricately interlinked and exhibit degeneracy, PCA struggles to effectively segregate these unique independent sources [13].…”

Section: Introductionmentioning

confidence: 99%

Online bunch-by-bunch position monitoring and analysis at the Taiwan Photon Source

Huang,

Hsu,

Chen

et al. 2023

J. Inst.

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The online bunch-by-bunch position monitor has been established through the utilization of a high-speed analog-to-digital converter, synchronized meticulously with the accelerator's radio frequency. This implementation serves the purpose of refining the alignment of the four injection kickers. A substantial volume of data needs to be managed when dealing with the motion of the bunches. To untangle the intricacies of bunch motion, an independent component analysis has been employed. This method efficiently segregates the bunch motion into discrete sources. The resulting bunch motion is a direct outcome of the linear combination of these distinct sources. Consequently, this approach significantly simplifies the overarching data analysis procedure. Throughout the injection phase, the predominant factors influencing the oscillation of filled bunches originate from three distinct sources. Firstly, there is a contribution arising from the mismatch among the four kickers during their activation period. Additionally, the damped betatron oscillation and the oscillation generated by wake fields constitute the other sources of bunch motion. To comprehend the tune variation in these sources, an examination is conducted through a numerical analysis of fundamental frequencies. Specifically, the tune associated with the betatron oscillation is contingent upon the amplitude of said oscillation. In contrast, the tune corresponding to the wake-field oscillation displays comparably minor fluctuations during both the growing and damping phases.

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Bunch by Bunch Position Measurement and Analysis at PLS-II

Cited by 2 publications

References 0 publications

A computing module for speeding up the bunch-by-bunch measurement of transverse positions and transverse profiles within injection period

A computing module for speeding up the bunch-by-bunch measurement of transverse positions and transverse profiles within injection period

Online bunch-by-bunch position monitoring and analysis at the Taiwan Photon Source

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