There are different types accelerators have been operating, constructing and planning.This paper provides a review and the present status of the accelerators in China Which includes collider, FEL, synchrotron light sources, spallation neutron sources, heavy ion accelerator and so on.

The talk shall present an overview of the FCC beam instrumentation needs, the corresponding main challenges. This will review the different R&D activities being currently pursued, including Beam position and loss monitoring, Transverse and longitudinal monitoring systems as well as polarimetry and luminosity monitoring.

NanoTerasu is a 4th generation 3 GeV light source newly constructed in Sendai, Japan. The circumference is 349 m and the natural emittance is 1.1 nm rad, which is realized by a double-double-bend lattice. The commissioning of the storage ring started in June 2023 and the stored current reached 300 mA in November. The beam diagnostic system for NanoTerasu mainly consists of button BPMs to monitor both single-pass and COD beam orbit, a DCCT to monitor the stored current, an X-ray pinhole camera to measure the beam size. To suppress collective instabilities, a transverse bunch-by-bunch feedback (BBF) system is also in use. The BBF system can also measure the betatron tune. In this talk, an overview of the beam commissioning of NanoTerasu, the performance of each beam diagnostic component, and fine-tuning of the electron beam optics will be presented.

HEPS is a fourth generation light source which has horizontal emittance around 34pm.rad and high brilliance photon beam, this ultra-low emittance brings many engineering challenges for beam instrumentation. Self-developed digital BPM electronics and scintillate BLMs contributed more in first turn and day one commissioning. The gird designed by combining carbon fiber and invar alloy have effectively suppress the long drift of the BPM system. Additionally, synchrotron radiation measurement system based on KB mirror has successfully captured the first synchrotron light and provided real-time beam size measurements. This talk will present an overview of beam instrumentation of HEPS.

The China Spallation Neutron Source (CSNS) facility began operation in 2018. By 2020, its accelerator achieved the design power of 100kW and currently operates at a power of 160kW. This year, the power upgrade project (CSNS-Ⅱ) has been launched to meet the growing scientific demands. Our goal is to enhance the accelerator power to 500kW primarily by increasing the beam current. A comprehensive suite of beam diagnostics has been developed to support commissioning and operation of the accelerator at higher intensities. In this paper, we first review the commissioning and operational status of the existing linac, and then outline the new requirements for the linac upgrade.

The Proton Radiation Effects Facility (PREF) aiming for the displacement damage effect research was proposed by XTIPC (Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences) in 2018. The facility was designed and constructed by IMP (Institute of Modern Physics, Chinese Academy of Sciences). The beam commissioning of PREF had been started since August to September of 2023. Four types of instruments, scintillation screen, Faraday cup, scintillator and ionization chamber are implemented for the proton beam profile, intensity, position, efficiency, spill structure. With the beam instruments, the machine reached nearly 95% slow extraction efficiency for all energies from 10 to 60 MeV, 5$\times10^{10}$ particle per second (ppp), 2$\times$2 cm² up to 20$\times$20 cm² scanning area.

SKIF is a synchrotron radiation facility under construction in Novosibirsk. Electron beam energy 3 GeV, beam current up to 0.4 A and extremely low horizontal beam emittance 75 pm$\cdot$rad are convenient to make a high-energy photon source at the main storage ring. Gamma-photons are obtained using Compton backscattering (inverse Compton scattering) of IR, UV and visible laser radiation. Using modern high-power lasers, Compton photons in hundreds-MeV energy range and rates up to 300 MHz can be achieved. Also, higher Compton photon energies (up to 2.6 GeV) can be generated using synchrotron radiation reflected towards the electron beam. A preferable option for photon monochromatisation is tagging photons by recoil electrons with resolution of 0.6%$\dots$0.8% (or $\sim$2 MeV), which is an advantage of ulta-low electron emittance. The discussed Compton source is mainly usable for photonuclear and photohadron processes such as photofission and production of $\pi$, $\eta$, $\Delta$ at nuclei. Also nonlinear QED, EM detectors calibration and other applications are in interest.

Over the past two decades, laser-driven proton radiotherapy devices have garnered significant attention among novel accelerator technologies, due to their high acceleration gradient. Peking University is engaged in the construction and development of CLAPA-II (the Compact LAser Plasma Accelerator II), a proton therapy facility which utilizes a laser-plasma acceleration scheme. This facility comprises two horizontal and vertical beam transmission lines, operating at a repetition rate of 1Hz, capable of delivering 10^8-10^10 protons per second. We have implemented both interceptor and non-interceptor detectors for precise measurements of proton beam. Notably, this is the first instance where an ionization chamber and cavity BPM have been integrated into a laser proton therapy accelerator. To validate the performance of our beam diagnostic system, we have established an offline test platform that simulates the laser proton beam. The results indicate that the offline test resolution of the cavity BPM has achieved 0.2μm in the range of ±3mm. Furthermore, we explored the absolute collection efficiency and particle recombination factor of ionization chamber with ultra-high dose rate proton beams, leveraging the laser-driven ultrashort electron beam generated by Peking University's CLAPA-I facility. This paper provides an overview of the beam diagnosis system's overall layout, accompanied by a detailed description of the detector design and corresponding measurement results.

The China Initiative Accelerator Driven System (CiADS), a multi-purpose facility driven by a 500 MeV superconducting RF linac, is currently under construction in Huizhou, Guangdong. In order to ensure the stable operation of the superconducting linac, we conducted optimization research on the beam quality in the front-end section of CiADS. By using the point scraping method, part of the beam halo particles are removed in advance at the entrance of the LEBT, avoiding the generation of beam halo particles. On the other hand, since the beam extracted from the ECRIS contains a portion of $H^{2+}$ and $H^{3+}$particles, impurity particles may lead to a decrease in the transmission efficiency of downstream accelerators. By separating the mixed beam, it is possible to measure the proportion and phase space distribution of the mixed beam at the exit of the ion source, thereby achieving accurate measurement of the proton beam. This paper mainly outlines the first beam commissioning of CiADS Front end. Additionally, the effectiveness of the point scraping method has been verified through transverse emittance measurement, and the proportion and phase space distribution of the mixed beam was measured. Furthermore, the stability of the ion source was tested, and the centroid shift of the ion source extracted beam was measured.

The 81.25 MHz quarter-wave resonator (QWR) and 162.5 MHz half-wave resonator (HWR) are selected as the main accelerating cavities for the superconducting ion linac of the High Intensity heavy-ion Accelerator Facility (HIAF) at the Institute of Modern Physics (IMP). Six QWR007 (βopt = 0.07) cavities and eight HWR015 (βopt = 0.15) cavities have been fabricated before the mass production to verify the design and production quality control. Two cavities of the both types have been random chosen to surface processing and vertical testing for performance validating before welding helium vessel. In this paper, the development of SRF cavity for HIAF will be addressed, which including the fabrication, surface processing and vertical testing results. The achieved gradients for both cavities have exceeded 60%~100% of requiring operation gradients. The Q0 of both types cavities have met the 2 K operation requirement too. These results inspired to push the cavity production for the HIAF project forward to the mass production stage.

INR RAS linac was developed in late 1970s and build during 1980s. Its timing system is based on the fifty years old technologies and requires full upgrade due to system stability decrease, lack of spare parts, progressing hardware degradation and increase in RF jamming. Moreover, the timing system upgrade should be done without additional accelerator complex shutdowns. In this paper a project of a new timing system that fulfills all requirements is presented. Various features and production peculiarities of the new timing system hardware and software are described. Results of the implementation of new system first parts and its commissioning and plans for future upgrade are discussed.

For future continuous wave (CW) and high-duty-cycle operation of the European XFEL, research and development of the DESY L-band CW photoinjector is ongoing. The implementation of a superconducting radio frequency (SRF) gun operated at 1.3 GHz with a copper photocathode is the baseline option. The electron beam quality, in particular the slice emittance, produced by this injector is key for the successful operation of the free-electron laser. In order to study the beam quality and stability of operation, a dedicated test stand and diagnostics beamline is being developed at DESY. Here, we present an overview of the foreseen diagnostic components and methods at the SRF CW photoinjector test stand.

" Laboratory for Ultrafast Transient Facility" is organically composed of two major categories of core parts: one is a Ultrafast Transient electron microscope cluster; the other is a Ultrafast Transient synchrotron radiation device that provides ultraviolet to X-rays. The first stage of synchrotron radiation device includes a 0.5 GeV linear accelerator as full energy injector, a high-current storage ring, and a beam line. For the construction of the linear accelerator beam diagnostics system, the main focus is on the reliability and maintainability of the system. The system mainly includes beam position measurement system , bunch charge measurement system and beam profile measurement system; the article will mainly introduce the composition and design of these systems.

Shenzhen Innovation Light-source Facility (SILF) is designed to be the so-called forth generation synchrotron radiation light source operating at 3.0 GeV, 300 mA, and with the emittance less than 100 pm∙rad. With the increase in luminosity of the light, higher stability of the electron beam is required, which may also result in increased measurement diversity and accuracy. Here, an overview of the SILF beam instrumentation system is provided, along with detailed descriptions of its key technology, including the Beam Position Monitor (BPM) and electronics, transverse feedback kicker and electronics, and beam transverse size measurement. Additionally, the future development of the beam instrumentation system is discussed.

The SESRI (Space Environment Simulation and Research Infrastructure) is a large-scale space science and technology experimental research accelerator clusters, the 300MeV proton and heavy ion accelerator is the key part. It consists of an ECRIS (Electron Cyclotron Resonance Ion Source), a linac cascade injector, a compact synchrotron, and three irradiation terminals. The proton and HI with 2MeV and 5.6MeV/U can be injected, and slowy extracted from the ring with the RF-KO and Ese. The operation cycle is about 3-10s. The Scintillation Screens are used to monitor the beam profile. They are driven by motors for the different orbits. The wire scanners are used to measure the beam profile during the acceleration process, in order to obtain the beam emittance; In order to meet the requirements of large current range, the BPM system adopts a Libra adjustable gain amplifier, and uses Libra Hadron to achieve BBB and 1kHz closed orbit measurement. RF-KO provides a transverse extraction electric field.Amplitude and frrequency modulation are used for the extraction signals. At the same time, a feedback system based on excitation and fast quadrupole is adopted. Through the above methods, the uniformity of beam extraction is greatly improved.

Huazhong University of Science and Technology is building a cyclotron-based Proton Therapy Facility (HUST-PTF). The facility mainly consists of a 240MeV superconducting cyclotron, a beam transport line, a fixed treatment room and two rotational treatment rooms. HUST-PTF uses three kinds of detectors, Scintillation, Faraday cup and ionization chamber, for the beam param-eter measurements. In terms of structure, the HUST PTF beam diagnostic system is built according to the standard distributed three-layer structure, which is divided into hardware device layer, data processing layer and GUI layer. Different protocols are used to communicate be-tween the three layers, which can improve reliability and expand flexibly in each layer.

The linac of INR RAS is а high-intensity accelerator of protons and H-minus ions, which is used for a complex of neutron sources, isotope production, proton irradiation and investigations in proton flash therapy. A non-destructive beam instrumentation plays a key role in the linac tuning. The general peculiarity of this multi-component system is that all detectors are home-made devices with a wide operation range and can be used at different ion linacs with a minimum adaptation to beam parameters. Beam current transformers for standard and in-air measurements, resonance and capacitive position and phase monitors, BIF-monitor for 1D and beam cross-section monitor for 2D non-destructive profile diagnostics. Different operation features and manufacturing peculiarities are presented in this paper. Results of implementation, operation and continuous upgrade are described. Also easily scalable typical designs of some detectors are discussed.

The Nuclear Data Production System (NDPS) was constructed at Rare Isotope Accelerator complex for ON-line experiments (RAON) to produce nuclear data for neutron-induced reactions at a few tens of MeV. For the neutron time-of-flight measurement, various neutron detectors, such as gas-filled Parallel Plate Avalanche Counter (PPAC), MICRO-MEsh-GASeous (MICROMEGAS), and EJ-301 liquid scintillation detectors, were installed in the NDPS neutron beamline. The NDPS recently performed its first beam commissioning with 16 MeV/nucleon 40Ar ion beams. For the measurement of the neutron beam, EJ-301 liquid scintillation detectors and activation foils (natAl, natFe, natZr, natAu, natBi, etc) were used to measure the neutrons from the graphite target. In this presentation, we report a detailed description of the NDPS neutron detection system with its current status.

This talk will show the infomation about IBIC2025.

This talk will show summary of IBIC2024.