Relativistic fast electrons are generated in the interaction of ultrashort (tens of fs) ultrahigh intensity laser (>1018W/cm2) pulses with solid target.Investigation of thegeneration and transport of fast electrons in solid material is a subject of intense research investigation not only for fundamental understanding of laser matter interaction in extreme condition but also for various...
During the last few years, IHEP plasma-based acceleration study group dedicated its time on both laser wakefield acceleration (LWFA) and plasma wakefield acceleration (PWFA).
In LWFA, we mainly focused on injection mechanism studies to improve the beam quality. Different injection schemes such as scissors-cross ionization injection, coaxial laser interference induced injection, tightly...
Based on the NCU 100-TW laser system, we use the hybrid scheme, proposed by Isayama et al, using dual laser pulses to drive 53 MeV protons. The dual pulses are identical (810-nm wavelength, 1.5-J energy, 30-fs pulse duration, and 5-micron spot size). The target is composed of a solid-density target and a near-critical density target.
This hybrid scheme combines the three typical schemes: RPA,...
A new project is underway to develop the successor to the current Australian Synchrotron. The new storage ring is proposed to be 450 m in circumference operating at 3 GeV. A preliminary 7BA lattice has been designed which utilises the higher-order achromat (HOA) scheme to suppress strong sextupole driving terms. The lattice has 24 sectors and a natural horizontal emittance of 50 pm-rad. This...
National Institutes for Quantum Science and Technology (QST, successor organization of National Institutes for Radiological Science) started carbon ion particle therapy in 1994.
Based on positive clinical results, carbon-ion radiotherapy was authorized as a Highly Advanced Medical Technology by Japanese government from 2003 and treatment for some kinds of cancers was applied to Japanese...
Centre for Medical Radiation Physics at University of Wollongong has long history of development of the silicon radiation detectors for dosimetry in X-ray and particle radiation therapy. Overview of the developed pixelated Si detectors and their applications for high spatial and temporal resolution dosimetry on medical linac and on proton and heavy ion therapy will be presented.
Progress in...
Developing an effective method for the injection and acceleration of positrons in plasma wakefield acceleration has been a persistent issue due to the lack of appropriate wakefield structure. We show that the plasma wakefield driven by a hollow proton beam forms an electron filament along the axis, thus providing the acceleration and focusing fields required by positrons. The evolution of the...
The online bunch-by-bunch position and phase monitor has been established by employing a high-speed analog-to-digital converter, meticulously synchronized with the accelerator's radio frequency. I/Q demodulation is utilized in the phase monitor to calculate the beam phase. To unravel the intricacies of bunch motion, independent component analysis has been employed, efficiently segregating the...
X-rays have extensive applications in biomedical research, physics, and materials science. The Laser Wakefield Accelerator (LWFA) is one of the methods capable of generating X-rays, featuring the advantage of a small footprint. This makes it more convenient for laboratories, hospitals, and other facilities to observe structures such as crystals, drugs, and proteins. The experiment uses the NCU...
KEK LUCX facility is a normal conductive multi-bunch electron linear
accelerator devoted to develop an intense monochromatic source of laser-Compton
X-ray for monochromatic X-Ray imaging. In order to perform samples
tomography, stable laser-Compton X-ray beam is necessary. From accelerator side,
laser-Compton X-ray generation stability is basically defined by electron beam
parameters...
Jyun-Wei Jheng1, Shih-Yao, Chiou1, Tsz-Yui Chan2, Sen-Hao Lee3, Tsi-Chian Chao1,2,3,4,5, I-Chun Cho1,5
1 Radiation Research Core Laboratory, Chang Gung Memorial Hospital Linkou Branch, Taoyuan, Taiwan.
2 Department of Medical Imaging and Radiological Sciences, Chang Gung University, Taoyuan, Taiwan.
3 Department of Radiation Oncology, Chang Gung Memorial Hospital Linkou Branch, Taoyuan,...
For demonstrating the beam focusing scheme required for linear colliders, the Accelerator Test Facility (ATF) at KEK is designed to focus an electron beam to 37 nm vertical size at the virtual interaction point (IP) utilizing the low emittance beam (vertical emittance: 12~pm.rad) generated in the damping ring. Because of the special focusing beam optics, even small angle changes of beam...
The laser wake-field acceleration (LWFA) provides energetic electron beams with higher acceleration gradient. The typical strength of the electrostatic field reaches GV/cm. Significant developments have been achieved in the past decades and various mechanisms have been proposed for beam quality improving. LWFA is expected to deliver high quality electron beams for potential applications....
According to the data and analysis of the Cancer Registry Annual Report in Taiwan, it can be seen from the trends in the past 10 years in 2020 that the growth in the incidence of major cancers is approximately 3.32% in the number of patients per year. The first new case of aggressive cancer finding in Taiwan is 116,131 and there are 30,796 patients received radiation therapy during the first...
Magnetic design and beam optics studies have been carried out for a K100 cyclotron, which can accelerate Q/A=1/2 ions to the maximum energy of 25 MeV/u. Since proton acceleration using H2+ instead of H+ or H- can double the maximum beam current primarily limited by space charge effects at the injection energy of compact cyclotron, we expect a maximum current of over 2 mA can be achieved by...
We present LCODE 3D, a new tool that allows for simulations of plasma wakefield acceleration in three-dimensional geometry using a quasi-static approximation. Based on the principles of the time-tested LCODE 2D code, LCODE 3D offers the flexibility of switching between different geometries, allowing for efficient work when three-dimensional effects have minimal impact. Furthermore, LCODE 3D is...
A new beam loss monitor (BLM) system has been installed and commissioned at the Australian Synchrotron. The new system consists of 28 beam loss detector (BLD) units and 14 signal processing BLM units distributed around the storage ring. Each detector unit consists of a plastic scintillator coupled to a photomultiplier tube. The signal processing units are Libera BLMs from Instrumentation...
The strive towards lower emittance in 4th generation light sources often restricts the dynamic aperture and lifetime, creating challenges for injection efficiency and commissioning. Once a circulating beam is established, BPM calibration, BBA and other optics corrections can be applied. However, with a limited DA, it can be difficult to establish a circulating beam at the start of...
The 6-MeV and 9-MeV electron linear accelerators (LINACs) were designed and constructed in 2015 and in 2018 at the Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Korea. Their C-band accelerating columns were chosen as a bi-periodic on-axis coupled structure and operated in the π/2 standing-wave mode. They are used for preclinical irradiators for in vitro studies of cells...
Recently, there has been considerable attention on high-polarization table-top hard X-ray sources, which facilitate easy deployment in clinics and university laboratories, providing convenient access to results regarding material microstructures or properties. Betatron radiation, one of the X-ray sources that has femtosecond range duration, μm spot size, and compact equipment, is considered an...
Various types of radioisotopes (RIs) are used in the field of nuclear medicine for diagnosis, such as PET and SPECT. In recent years, RIs are applied to therapy of cancer and the Ac-225 has been confirmed to be effective in the treatment of advanced cancer. One of the promising RI production methods for medical application is the use of high-intensity beam in accelerators. In the case of an...
A 4th Generation Light Source is being built in Ochang, Korea (Korea-4GSR project). It can produce synchrotron light that is 100 to 1000 times brighter than that of the 3rd generation source like PLS-II in the Pohang Accelerator Laboratory (PAL). The Korea-4GSR is designed to have a circumference of 800 meters to implement a Diffraction-Limited storage ring. This size is three times that of...
Quasistatic approximation (QSA) offers opportunities for computationally efficient modeling of laser pulse propagation over long distances. When simulating the channeling of a powerful laser pulse over tens of meters (studied in the context of XCELS project), the QSA gives a speedup of six orders of magnitude compared to the particle-in-cell method. This estimate takes into account the need to...
Introduction: Detectors that can provide accurate dosimetry for microbeam radiation therapy (MRT) must satisfy a number of challenging criteria including having intrinsic radiation hardness, a high dynamic range, energy and dose rate independence, and a spatial resolution able to resolve x-ray microbeam spacings on the order of hundreds of microns.
At the Centre for Medical Radiation...
A project to develop a linac-based MIR/THz free-electron laser (FEL) light source and experimental stations for spectroscopic and ultrafast interaction applications is underway at Chiang Mai University in Thailand. The accelerator system serving as the electron beam injector is an existing system, albeit with modifications to accommodate two newly developed beamlines for MIR/THz FEL....
By introducing the electron-optic Sampling technique in to the research of laser Wakefield acceleration, we have conducted single-shot spatial-temporal detection on the electron bunches.In our recent experiments, we have measured the electron timing fluctuation at a position outside the plasma. By simultaneously performing optical transition radiation imaging and EO spatial decoding, the...
Fabricating a thin, dense gas target capable of providing a plasma electron density of > 10^{19} cm^{-3} enables the operation of laser wakefield acceleration (LWFA) with few-TW or even sub-TW pulses, as a strong laser intensity can be achieved for the self-focused and self-modulated pump pulse to drive plasma waves for electron acceleration. The high plasma density used here, however, results...
FLASH radiotherapy (RT) is an emerging cancer treatment modality that utilises much higher dose rates than conventional RT. Delivering radiation with ultra-high dose rates (UHDR) has been shown to spare healthy tissue while providing an equal or greater dose to the tumour. Current research suggests the use of very high-energy electrons can provide further benefits, such as treatment of deep...
Tunka-Grande and TAIGA-Muon are scintillation detector arrays that are part of the TAIGA gamma observatory located near Lake Baikal. TAIGA is a hybrid complex of different systems located on an area of 1 km2 and detecting simultaneously secondary charged particles and Cherenkov light produced by extensive air showers (EAS). The experimental scientific program covers gamma-ray astronomy, cosmic...
This work presents recent achievements in development and applications of ANSTO’s ANTARES [1] and SIRIUS [2] microprobe systems for the high-precision irradiation of materials and devices for prototyping and applications to microelectronics, photovoltaics and space. The ANSTO systems can be optimized to deliver a required combination of linear energy transfer, ion range, scanning size and...
Synchrotron radiation induced high yields of gas-desorption and photoelectrons from the vacuum beam ducts of large accelerators results in huge impacts of shortening the beam lifetime and beam instabilities from the trapped ions or electron cloud. Inspection of surface cleanness and coated materials on top surface layers of beam ducts by directly measuring the photon stimulated desorption...
In recent years, Boron Neutron Capture Therapy (BNCT) has seen vigorous development, and the BNCT facility (D-BNCT) at the People's Hospital of Dongguan City, Guangdong Province, is also under construction. This report introduces the design and implementation of the accelerator control system for D-BNCT, which utilizes the Experimental Physics and Industrial Control System (EPICS) as the...
The KEDR detector at the VEPP-4M accelerator complex plans to measure the mass
of the Y(1S) meson with an accuracy better than 50 keV. This experiment
requires precision measurement of the beam energy. The most accurate method of
measuring beam energy is the resonance depolarization method. The method is
based on the connection of the particle energy with the spin precession
frequency,...
We have developed a periodic Cherenkov radiator to obtain narrow band Cherenkov radiation. Since the radiation spectrum of Cherenkov diffraction radiation from the radiator contains strong higher order harmonics, the bunch form factor of the electron beam is expected to be deduced precisely, so that the very short bunch less than 10 fs (such as the laser wakefield accelerated beam) is able to...
The T2K experiment is a long baseline neutrino oscillation experiment aiming to discover CP violation in neutrino mixing. A new detector, SuperFGD, has been installed in the near detector since October 2023 to reduce systematic errors in the neutrino oscillation analysis. It consists of about 2 million 1 cm scintillator cubes, about 56,000 wavelength shifting fibers penetrating them from three...
The KEK Central Computing System (KEKCC) is a computer service and facility that provides large-scale computer resources, including Grid and Cloud computing systems and essential IT services, such as e-mail and web services.
Following the procurement policy, we have replaced the entire KEKCC with a new one once every four or five years. Since 2024 is the last year of the current KEKCC...
Access to proton therapy is limited by both facility cost and existing technological limitations. The beam delivery system (BDS) has been identified as a bottleneck, particularly for new and emerging methodologies such as FLASH, Arc, and multi-ion therapies. This talk will discuss a new collaborative project between Harvard/MGH, University of Melbourne and Pyramid technologies for a compact,...
The Low Gain Avalanche Diode (LGAD) is a novel silicon sensor known for its excellent timing resolution. The AC-Coupled LGAD (AC-LGAD) is a new type 4D detector developed based on LGAD technology, capable of accurately measuring the time and position information of particles. This presentation will showcase the development status of LGAD and AC-LGAD sensors designed by the Institute of High...
To process experimental data from high-energy physics experiments, large amounts of data should be shared world-widely. Data movement is essential for global collaborative research. We introduce KREONET/KREONet2, national science and research network in South Korea that enables to transfer big data for high-energy physics community in Asia. Also we gives a talk about collaborative efforts to...
Linac-based coherent THz radiation sources are being developed with the NSRRC high brightness photoinjector which has been installed in the Accelerator Test Area (ATA). The injector is equipped with a laser-driven photocathode rf gun and a 5.2-m long S-band traveling-wave linac for beam acceleration. A 25 MeV beam of bunch length as short as 240 fs has been produced from this injector by the...
The China Spallation Neutron Source (CSNS) was completed in March 2018, and it is the first spallation neutron source in China. The CSNS project plans to construct four beamlines for beam expansion applications, including a back-streaming white neutron beamline, a medium-energy proton beamline, a high-energy proton beamline, and a surface muon beamline. Around these four beamlines, we have...
As echoing to the national demanding for industry development, the Industry Application Division (IAD) in the National Synchrotron Radiation Research Center (NSRRC) in Taiwan was established and launching its mission since 2008. Serving as the acting window in NSRRC, the IAD bridges the synchrotron-radiation (SR) analytical tools mainly to key domestic industries with practical and critical...
We’d like to talk about the status and prospect on the research network and grid computing for high energy physics studies in Taiwan.
PAL, established in 1988 with full support from the Pohang University of Science and Technology, has acted as a powerhouse to support basic science and technology in Korea and has secured a competitive edge frontier after making ceaseless efforts. PAL is now operating PLS-II and PAL-XFEL.
PLS-II is the 3-rd generation synchrotron with 3-GeV beam energy and 5.8 nm emittance. Thirty-six...
The ILC (The International Linear Collider) project has not yet started, however basic technology development must continue.
ITN (ILC Technology Network) is an international framework for carrying out technology development.
ITN is a project that started in FY2023 and will continue for five years.
Several technical issues have been proposed as development items at ITN, and each item will be...
In 2023 J-PARC Main Ring achieved 750kW beam power for T2K neutrino experiment. The 750kW is the initial design value of MR and it means to reach a great milestone. In this talk, I will briefly introduce the key technologies needed to achieve this 750kW. One of the key technologies is the injection and extraction systems. The kicker magnet and power supply, septum magnet and power supply used...
Now there are several colliding beam experiments proposed for realisation in a future all around the world. Among them are hadron colliding beam experiment SPD at NICA (JINR, Dubna, Russia)[1], electron-positron colliding beam experiments SCTF (Sarov, Russia)[2], STCF (Hefei, China), CEPC (China)[3], and electron-ion colliding experiment EicC (Huizhou, Guangdong, China) [4]. The construction...
A 230 MeV superconducting cyclotron SC230 is currently the most compact isochronous cyclotron for proton therapy, with a yoke diameter, height and weight of 2.8 m, 1.7 m and 65 t, respectively. It has cryogen-free superconducting coils to generate a high magnetic field. It also features a high beam current of up to 1 μA and low power consumption of its system below 200 kW. The development...
The Rare isotope Accelerator Complex for ON-line experiments (RAON) is a heavy-ion accelerator for researches using Rare Isotopes (RI) as a major research facility in Korea. It can deliver ions from hydrogen (proton) to uranium. Protons and uranium ions are accelerated up to 600 MeV and 200 MeV/u respectively. It can provide various rare isotope beams which are produced by isotope separator...
The MIP Timing Detector (MTD) is a new sub-detector planned for the Compact Muon Solenoid (CMS) experiment at CERN, aimed at maintaining the excellent particle identification and reconstruction efficiency of the CMS detector during the High-Luminosity LHC (HL-LHC) era. The MTD will provide new and unique capabilities to CMS by measuring the time-of-arrival of minimum ionizing particles with a...
High-field cyclotron systems are strongly demanded for multi purposes: PET, targeted $\alpha$-particle therapy, etc. To install such systems into hospitals, as light weight and compactness are also required, we have been developing a new coreless cyclotron system with high-temperature superconducting (HTS) magnet, named “Skeleton Cyclotron.” The coreless cyclotron has a superior feature of...
For the China Spallation Neutron Source (CSNS), the rapid cycling synchrotron (RCS) accumulates and accelerates the injection beam to the design energy of 1.6 GeV and then extracts the high energy beam to the target. As the second phase of the CSNS, CSNS-II will achieve a beam power on the target of 500 kW. The injection energy of CSNS-II will be increased from 80 MeV to 300 MeV and the...
The ALICE (A Large Ion Collider Experiment) collaboration is gearing up for an upgrade of the Inner Tracking System (ITS2) during the LHC Long Shutdown 3 (2026 - 2028). The upgrade will replace the three innermost layers of ITS2 with a truly cylindrical vertex detector, ITS3. This innovative tracker is composed of a 65 nm CMOS Monolithic Active Pixel Sensor (MAPS) employing stitching...
Simulations of plasma wakefield acceleration are challenging for many reasons, one of which is that the wave scale (about plasma skin depth) is much larger than the Debye length. Attempting to resolve both would make simulations prohibitively expensive. Therefore, grid steps far exceeding the Debye length are used, which compromises the accuracy of PIC simulations. While this inconsistency...
We have achieved a groundbreaking demonstration of utilizing FNDs as scintillators for imaging synchrotron-based EUV radiation. The carbon-based scintillator comprises an ensemble of NV0 centers serving as the primary source of light emission upon above-bandgap excitation (energy > 5.47 eV or wavelength < 227 nm) within the diamond matrix. These centers exhibit exceptional characteristics,...
The NSRRC operates two synchrotron radiation light sources, Taiwan Light Source and Taiwan Photon Source. Both sources employ superconducting radio frequency (SRF) cavities. Recently, occurrences of multipacting events have been encountered during the operation of the SRF modules in both sources, leading to operational challenges. In this report, we provide an overview of the SRF modules in...
Plasma wakefield acceleration is a promising technology for compact particle acceleration, experimental results demonstrating a high-quality beam reaching 1GeV energy in just 3.3cm [1]. Simulations are a key tool used to develop our understanding of plasma wakefield technologies, however, conventional particle-in-cell (PIC) codes can be arduous to run, requiring significant computing power....
High Energy Photon Source (HEPS) is a high-performance and high-energy synchrotron radiation light source with a beam energy of 6GeV and an ultra-low emittance of better than 0.06nm×rad. The HEPS is mainly composed of accelerator, beamlines and end-stations.The cryogenic system includes a helium refrigerator system and a nitrogen cryogenic plant. The helium refrigerator system has been...
Electron-Ion Collider (EIC) is a new collider to explore the fundamental structure and dynamics of matter in the visible world. The EIC project includes a general-purpose detector: The ePIC Detector. The unique physics goals at the Electron-Ion Collider lead to specific design considerations for the electromagnetic calorimeter in the barrel region. The Barrel Imaging Calorimeter comprises...
Superconducting undulators have become a research hotspot of the insertion devices in the synchrotron radiation facility. However, the cryostat, which is used to create a liquid helium temperature environment, often causes the failure of the superconducting undulator. In this work, a cryostat with a new refrigeration distribution for a superconducting undulator is designed, fabricated and...
Terahertz (THz)-driven accelerators are emerging as promising compact particle accelerators. By using higher frequency drivers, the threshold of vacuum breakdown can be significantly increased. Consequently, it is anticipated that the accelerating gradient can be enhanced, projecting an increase from the current 100 MV/m-order to 1 GV/m-class. To generate the high-field THz waves, laser-driven...
ALICE 3 is the next-generation heavy-ion experiment proposed for the LHC Run 5 and 6. Its tracking system will be based on a vertex detector, integrated into a retractable structure inside the beam pipe to achieve the best possible pointing resolution, and a large outer tracker, surrounding the vertex detector and covering about eight units of pseudorapidity ($|\eta|<4$). The tracking system...
The Electron-Ion collider (EIC) is designed to collide spin-polarized beams of electrons and ions to study with precision the dynamics of gluons and sea quarks and their role in the structure of visible matter. The ePIC is a general-purpose large-acceptance detector and will be the first experiment operated at the EIC. For studies aiming at the three-dimensional structure of nucleons and...
The 650 MHz single-cell superconducting radio-frequency (SRF) cavities used for the Circular Electron Positron Collider (CEPC) were studied to achieve a high accelerating gradient (Eacc) and high intrinsic quality factor (Q0). The 650 MHz single-cell cavities were subjected to a combination of buffered chemical polishing (BCP) and electropolishing (EP), and their Eacc exceeded 40 MV/m. Such a...
The China Spallation Neutron Source (CSNS) delivers a pulsed neutron beam at a 25Hz repetition rate, necessitating precise data synchronization for effective beam state analysis and fault diagnosis. This work presents the development of a Beam-Synchronized Data Acquisition (BSDAQ) system tailored for the CSNS accelerator. The BSDAQ system is engineered to selectively capture critical...
We have developed a new segmented capillary gas cell for laser wakefield acceleration (LWFA) and plasma lenses. This capillary enables the tailoring of longitudinal density profiles in gases or plasmas, with a transverse guiding structure when discharged with high-voltage pulses. For instance, a down-gradient density profile can be used for controlled injection in LWFA. We tested this...
Liquid argon detectors are used in a variety of fundamental physical experiments, such as dark matter searches and neutrino studies. The use of argon as a target medium is largely due to its high light yield. However, the maximum emission intensity occurs at a wavelength of 128 nm, which is difficult to detect with high efficiency. The standard solution is to use wavelength shifter, which...
High energy proton colliders towards 100 TeV are proposed these years to study the physics beyond the Standard Model. The colliders call for 16-20 Tesla (T) accelerator magnets to bend and focus the particle beams. IHEP-CAS has been engaged in developing high field magnet technology with Nb3Sn and HTS materials from 2014: several model dipoles have been developed with combined common coil...
In 2015, Taiwan Photon Source (TPS) successfully completed a significant project involving the installation of a crucial 600-meter-long liquid nitrogen (LN2) transfer line specifically designed for beamline endstations. This line previously supplied liquid nitrogen to a maximum of 24 beamline endstations. Subsequently, in 2018 and 2019, Beamline Endstation 13A was inaugurated, focusing on...
The pulse duration of the X-ray free-electron laser (XFEL) relies on the pulse duration of the light source, which commonly is an electron bunch. The energy and the current distributions of the electron bunch can be manipulated by using the laser heater in the purpose of generating attosecond pulse duration electron bunch. Therefore, the resultant electron bunch current profile after the bunch...
Korea CMS is one of the only two organizations, along with CERN micro pattern technology workshop, capable of producing large GEM foils, playing a crucial role in the CMS GEM upgrade. To achieve this, it has built the world's first large GEM production facility using the double-mask etching technology, which is suitable for faster production. The validation results and mass production progress...
To meet the 500kW beam power requirement of China spallation neutron source project Phase-II (CSNS-II), an external antenna RF-driven negative hydrogen ion source has been developed. It has been put into commissioning on China spallation neutron source (CSNS) accelerator since September of 2021. In the last two run cycles, it has operated for 315 days and 323 days respectively, with 100%...
The sensitivity of the direct dark matter search is being improved by various energy-sensitive experiments such as XENONnT, LZ, Panda-X and so on. On the other hand, in order to reveal properties of the dark matter particle after its discovery or to explore beyond the neutrino-fog region, direction-sensitive dark matter search is designed and taken place recently.The 3D tracking technology of...
Helium has excellent properties that cannot be replaced by other substances, such as complete inertness, cryogenic boiling point, high thermal conductivity, low density, low solubility, high diffusivity, non-irritant properties, and low viscosity. Helium is used in medical field to cool superconducting magnets in MRI, in industry for optical fiber and semiconductor manufacturing, welding, leak...
Since neutrons are secondary particles, their efficient use is important in applications. Even neutrons, which have no electric charge, can be deflected by magnetic fields due to their magnetic dipole moment. Transport and manipulation of neutron beams using magnetic fields will be discussed.
The GEM neutron detector incorporates a layer of boron for neutron capture.
The aim is to offer more cost-effective and larger-scale coverage for neutron detection compared to conventional cold neutron detectors.
We present the results of the beam test using cold neutrons (10 meV) at HANARO (High-Flux Advanced Neutron Application Reactor), analyzing the hit positions of the neutron beam and...
Several aspects of the operation of ANU linac cryogenic system is discussed. We will describe the upgrade options of the 30 years old cryogenic facility.
There are two research reactors at the Institute for Integrated Radiation and Nuclear Science, Kyoto University (KURNS). Kyoto University Research Reactor (KUR) of one of the reactors, which has a thermal output (5 MW), is scheduled to be shut down in May 2026. The KUR has been used for many years as a neutron source for collaborative research, and we are considering the construction of a...
A two-cell 1.5-GHz superconducting radio-frequency (SRF) cavity was designed and optimized by NSRRC previously, and then manufactured by Mitsubishi Heavy Industry Machinery Systems (MHI MS), Japan. Following post processes on this SRF cavity such as electrical polishing (EP), annealing, and pre-tuning, had been finished in KEK, Japan in 2023 under a cooperation agreement between NSRRC and...
The time performance of photodetector is a critical parameter for the development of Radiation Imaging Detectors based on time of flight (TOF) technique, for example TOF positron emission tomography (TOF-PET). In 2020, the proposal of roadmap toward the 10 ps TOF-PET challenge places higher requirement on the time performance of the photodetector. Microchannel Plate Photomultiplier (MCP-PMT)...
The CSNS is an accelerator-based multidisciplinary user facility operates at a stable beam power of 140 kW since October 2022, which is 40% higher compared to the designed value. The upgrading project of CSNS (CSNS-II) is in progress, and the missions associated with linac include increasing the output energy to 300 MeV by employing superconducting accelerator and the peak current to 50 mA. A...
In the operation of the cryogenic helium distribution system for TPS superconducting radio frequency (SRF) cavities, thermal acoustic oscillations (TAOs) frequently arise, causing pressure fluctuations in the cold helium gas processing lines, reaching up to 65 mbar. These TAOs introduce an additional heat load, impacting the operational stability of the SRF cavities. To address this issue,...
