This study conducted offline calibration tests on the stripline Beam Position Monitor (BPM) designed for the Hefei Advanced Light Facility (HALF) injector. The Lambertson method was used to measure the off-set between the electrical center and the mechanical center of the BPM, with results showing horizontal and vertical offsets of 0.1154 mm and 0.1661 mm, respec-tively. Additionally, the wire-scan method was em-ployed to construct the BPM mapping, and polynomial fitting was applied to effectively reduce the BPM’s nonlinearity and system errors. The experimental re-sults provide essential data support for the optimiza-tion and practical application of the BPM in the HALF injector.

This paper presents a bunch-by-bunch profile measurement system, which includes an optical imaging frontend, a multi-channel photomultiplier tube (MAPMT) for photoelectric conversion, and a high-sampling-rate oscilloscope for data recording. The system is capable of measuring the transverse positions and sizes of each bunch in the storage ring during the beam availability period of the Hefei Light Source II (HLS-II). By finely processing the collected data, the system can effectively recognize the dynamic characteristics of the beams and monitor the performance of the light source. Here, the paper elaborates on the system’s design principles, optical layout and system configuration. It also introduces the program workflow of data processing, along with an analysis of the corresponding measurement errors.

To address non-standard Gaussian beam spot pro-files in injectors, this paper proposes a fitting algo-rithm based on Gaussian, the newly introduced Gener-alized Gaussian Type and Skewed Gaussian Type dis-tributions. These distributions are specifically de-signed to better fit non-Gaussian and asymmetric beam spots by automatically selecting the most suitable model. Validation using beam spot images from the YAG screen after the electron gun in the Hefei Light Source II (HLS-II) injector demonstrates that the Gen-eralized Gaussian Type is effective for fitting sharp or broad profiles, while the Skewed Gaussian Type is well-suited for handling asymmetry. Compared to tra-ditional methods, the proposed algorithm improves fitting accuracy and adaptability, providing a practical solution for complex beam measurement challenges.

The Siberian Ring Photon Source (SKIF) is a fourth-generation synchrotron light source that operates at a beam energy of 3 GeV. In order to ensure the reliable operation of the accelerator, a beam loss diagnostics system will be implemented. For the linear accelerator, linac-to-booster and booster-to-storage ring transfer lines, fiber-based Cherenkov beam loss sensors will be used. Multi-mode quartz fibers and photo multiplier tubes (PMTs) will provide spatial resolution for this diagnostic system at a level of about 1 meter. The storage ring will be equipped with 128 scintillation-based detectors with acquisition electronics that are placed around the circumference of the ring. These detectors will be able to measure beam losses both during beam injection and during regular SKIF operations for SR users. Since SKIF will operate in different working modes, the BLMs system will require high sensitivity, a large dynamic range, and sophisticated electronics. The paper describes the design of both types of beam loss monitors (BLMs) and the choice of their positioning around the storage ring. It also discusses the final design of the acquisition electronics, the tests of the BLMs and the current status of diagnostics.

The fourth-generation synchrotron light source Siberian Ring Photon Source (SKIF), located in Novosibirsk, Russia, underwent the tuning of its linear accelerator segment successfully. By deploying a designed beam diagnostic system, crucial parameters of the beam including beam transverse and longitudinal dimensions, energy spread, emittance, and current, were accurately measured. To achieve these measurements, the system was equipped with several fluorescent screens, Cherenkov radiation detectors, a dipole energy spectrometer, and a Faraday cup. This paper elaborates on the design, mode of operation, and practical applications of these diagnostic devices during the accelerator's tuning process. Further, potential areas of optimization for these diagnostic methods are explored to provide feasible directions for enhancing the performance of the linear accelerator. These precise diagnostic tools have been pivotal in the successful tuning of the SKIF linear accelerator. The results thus gathered will form a significant reference point for the development and refinement of similar accelerators in the future.