Design and fabrication of button-style beam position monitors for the HEPS synchrotron light facility

He, Jun; Sui, Yanfeng; Li, Yong; Tang, Xuhui; Wang, Lin; Liu, Fang; Li, Zhi; Yu, Lianghong; Liu, Xiaoyu; Xu, Taoguang; Cao, Jianshe; Yue, Junhui

doi:10.1007/s41365-022-01126-7

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…Taking the BPM of the HEPS storage ring as an example, the cross section of the vacuum pipe is a circle with a diameter of 22 mm, the diameter of the button electrode is 8 mm, and other mechanical parameters can be found in the references [15]. We used the CST Studio Suite software [16] to calculate the signals on the four button electrodes with the beam at the position of a 49 × 49 dot matrix, which was in the range of ±6 mm and a step size of 0.25 mm [16].…”

Section: Polynomial Order and Fitting Errormentioning

confidence: 99%

Preliminary Analysis of Beam Position Monitor Accuracy

He,

Sui,

Liang

et al. 2024

Symmetry

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The beam position is the most important reference basis for the operation of synchrotron radiation light sources, particularly for commissioning the first-turn injection of fourth-generation light sources. To improve the accuracy of the beam position measurement, we analyzed methods for calculating the beam position, and a finite element calculation and the stretched wire calibration system were used to demonstrate the procedure. We proved the relationship between the coverage range, fitting order, scanning step size, and accuracy both theoretically and experimentally, which can provide a basis for selecting the appropriate fitting order for different operation stages of the accelerator. It was proved that the accuracy of beam position calculations using simplified polynomial coefficients is comparable to those without a simplified one, which can save resources for reading electronic processing. The testing results of a batch of beam position monitors (BPMs) were in good agreement with the finite element calculation results, and the small difference between the manufactured BPMs also proved that quality control was performed well, and it benefited from button sorting.

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Section: Polynomial Order and Fitting Errormentioning

confidence: 99%

Preliminary Analysis of Beam Position Monitor Accuracy

He,

Sui,

Liang

et al. 2024

Symmetry

Self Cite

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“…Due to the complex shape and the material characteristics of the PU, the field theory of guided waves has to be used for the computation of the signals available at the BPM ports. This approach is so complex that, apart from very simple coaxial geometries, the PU high-frequency behavior must be studied by numerical methods [17,18].…”

Section: Transfer Impedance and Signal Extractionmentioning

confidence: 99%

Button-Type Beam Position Monitor Development for Fourth-Generation Synchrotron Light Sources: Numerical Modeling and Test Bench Measurements

Cleva,

Bassanese,

Comisso

et al. 2024

Sensors

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This paper addresses the design of beam position monitor (BPM) devices suitable for fourth-generation diffraction-limited X-ray storage rings. Detailed investigations of the electromagnetic (EM) phenomena occurring inside the component under various working conditions are carried out by considering different BPM EM models defined by their geometry and materials. Moving from a theoretical characterization of the common round geometry, rhomboidal structures are studied through a careful numerical analysis relying on advanced computer-aided tools. Several critical elements, such as wakefields, pick-up signal extraction, and trapped and propagating modes, are explored from the simulation point of view and from the experimental one, by deploying a manufactured microwave test bench, which is employed to measure the radio frequency behavior of a BPM prototype built at Elettra Sincrotrone Trieste. The aim of the proposed study is to identify a satisfactory tradeoff between achievable performance and practical realizability for BPM devices operating in last-generation light sources.

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