Chinese Spallation Neutron Source (CSNS) is a facility planned to be built in China in the coming years. It is composed of 80 MeV Linac, 1.6 GeV Rapid Cycling Synchrotron (RCS) and target station. To accelerate the proton beam from 80 MeV to 1.6 GeV, the RCS requires the field of dipole and quadrupole magnets to change with sine waveform of 25 Hz plus a biased DC. For large amplitude AC magnets with large aperture, there are critical issues to be addressed, such as eddy current induced in the magnet yoke, coils and endplates, vibration of the yoke and coil, field tracking between dipoles and quadrupoles, and so on. To study these issues, one prototype dipole magnet and one prototype quadrupole magnet have been developed and tested. In this paper, the design, fabrication and tests of the two magnets will be described.

The European XFEL (EXFEL) will be a user facility. In the startup configuration it will consist of three beam lines named SASE1, SASE2 and SASE3. For the SASE2 beam line a first undulator prototype called U48 has been developed and tested in a collaboration between the Institute of High Energy Physics (IHEP), CAS, China and EXFEL. It is 5-meter-long and the longest one ever developed and built successfully in China. Its weight is 8-tons. This contribution describes its design and specifications, dedicated R&D activities especially on the magnet material, mechanical design issues, the control system and the mechanical assembly. Finally results of magnetic measurements and tuning are presented.

In the cooperation between IHEP and EXFEL, the first undulator prototype (U48) for EXFEL was developed by IHEP. In order to meet, maintain and verify the magnetic performance of U48, a 6.5 meters long magnetic measurement bench has been built in IHEP. The measurements are done with the probes moved through the gap of U48 by the measurement bench. The measurement system consists of an accurate bench, motion control cabinet and data acquisition devices. The development status of the system is described in this paper. The characteristics and performances of the magnetic field measurement system are presented.

The design, fabrication and field measurement of 11 DC curved dipole magnets for the PEFP Beam Line have been completed. In this paper, a design method for a complex end chamfer using OPERA-3D is proposed. The conventional method for estimating chamfer shape is extended and applied to a curved dipole magnet by a coordinate transformation. Using the interface with CAD software, the complex end chamfer is modeled and fully determined by 3D simulation to meet the field uniformity requirement. The magnetic field measurement results are in good agreement with the simulation. The design considerations, field simulation results, end chamfer development process and measurement results are presented in detail.

Permanent magnets are superior to electromagnets in generating strong multipole magnetic fields. Their fields are sometimes stronger than those that can be generated by superconducting magnets with the same bore radius, when the number of poles are higher. Three fabricated multipoles including a quadrupole magnet for the ILC (International Linear Collider) final focus doublet, a quadrupole magnets as a spin filter for cold neutrons, and a sextupole magnet for neutron beam focusing are described.

A dynamic measurement system was developed by the Institute of Modern Physics (IMP) for the dipole prototype of Rapid Cycle Synchrotron (RCS) of China Spallation Neutron Source (CSNS). The repetition frequency of RCS is 25 Hz. The probe is a moving arc searching-coil, and the data acquisition system is based on the dynamic analysis modular of National Instrument. To get the error of high order harmonics of the field at basic frequency, the hardware integrator is replaced by a high speed ADC with software filter and integrator. A series of harmonic coefficients of field are used to express the varieties of dynamic fields in space and time simultaneously. The measurement system has been tested in Institute of High Energy Physics (IHEP), and the property of the dipole prototype of RCS has been measured. Some measurement results and the repeatability of system are illustrated in this paper.

CSNS accelerator mainly consists of an H linac and a proton rapid cycling synchrotron. It is designed to accelerate proton beam pulses to 1.6GeV kinetic energy at 25 Hz repetition rate, striking a solid metal target to produce spallation neutrons. The accelerator is designed to deliver a beam power of 120 kW with the upgrade capability up to 500 kW, The CSNS accelerator is the first large-scale, high-power accelerator project to be constructed in China and thus we are facing a lot of challenges in some key technologies. A series of R&D for major prototypes have being conducted since 2006, including an H ion source, DTL tank, RF power supply for the linac, injection/extraction magnets and its pulse power supplies, dipole and quadrupole prototype magnets in the ring and its power supplies, ferrite-loaded RF prototype cavity, ceramic vacuum chamber, control and some beam diagnostics. This paper will briefly introduce the design and R&D status of the CSNS accelerator.

A proton therapy facility based on a linac injector and a slow-cycling synchrotron is proposed. To obtain good treatments for different cancer types, both the spot scanning method and the double-scattering method are adopted in the facility, whereas the nozzles include both gantry and fixed beam types. The proton accelerator chain includes a synchrotron of 250 MeV in maximum energy, an injector of 7 MeV consisting of an RFQ and a DTL linac, with a repetition rate of 0.5 Hz. The slow extraction using the third-order resonance and together with the RFKO method is considered to be a good method to obtain a stable and more-or-less homogenous beam spill. To benefit the spot scanning method, the extraction energy can be as many as about 200 between 60 MeV and 230 MeV. A new method - the emittance balancing technique of using a solenoid or a quadrupole rotator is proposed to solve the problem of unequal emittance in the two transverse planes with a beam slowly extracted from a synchrotron. The facility has been designed to keep the potential to be upgraded to include the carbon therapy in the future.

The China Spallation Neutron Source (CSNS) complex consists of an H- linear accelerator, a rapid cycling synchrotron accelerating the beam to 1.6 GeV, a solid tungsten target station and instruments for spallation neutron applications. The facility operates at a 25-Hz repetition rate with an initial design beam power of 120 kW and is upgradeable to 500 kW. The primary challenge is to build a robust and reliable user-friendly facility with upgrade potential at a fraction of the "world standard" cost. Success of the project relies on the results of prototyping research & development (R&D) of key technical systems and components. This paper discusses the prototyping experiences of the past two and a half years.

The China Spallation Neutron Source (CSNS) is an accelerator based multidiscipline user facility planned to be constructed in Dongguan, Guangdong, China. The CSNS complex consists of an negative hydrogen linear accelerator, a rapid cycling proton synchrotron accelerating the beam to 1.6GeV energy, a solid tungsten target station, and instruments for spallation neutron applications. The facility operates at 25Hz repetition rate with an initial design beam power of 120kW and is upgradeable to 500kW. The primary challenge is to build a robust and reliable user's facility with upgrade potential at a fraction of “world standard” cost. We report the status, design, R&D, and upgrade outlook including applications using spallation neutron, muon, fast neutron, and proton, as well as related programs including medical therapy and accelerator-driven sub-critical reactor (ADS) programs for nuclear waste transmutation.

The 1.6GeV synchrotron of China Spallation Neutron Source (CSNS) project is a Rapid Cycling Synchrotron (RCS), which accelerates a high-intensity proton beam from 80MeV to 1.6GeV at a repetition rate of 25Hz. The RCS magnet system consists of 24 dipole magnets (main dipoles), 48 quadrupole magnets (main quadrupoles), 16 sextupole magnets, some tune shift quadrupoles and corrector magnets. All the magnets are of large aperture for a high beam power of 0.1MW, one design issue is the fringe field at pole end. And the main dipoles and main quadrupoles work at 25Hz repetition rate, the eddy current is an additional issue. In this paper the magnet design of the two kinds of main magnets will be described.

The BEPCII is the upgrade project of the Beijing Electron Positron Collider (BEPC). According to the BEPC II double ring design scheme, a new ring will be added in the existing BEPC tunnel. The machine will provide electron and positron beams with an energy range from 1.0GeV to 2.1GeV for high energy physics research, and an electron beam of 2.5GeV, 250mA for synchrotron radiation. So actually there are three storage rings for the BEPC II machine. Due to the limited space of the existing BEPC tunnel and the requirement of high luminosity, the antechamber type vacuum chamber is used, that makes the BEPC II magnets' design and fabrication very difficult. In the paper the general features of the design and fabrication of several kinds of main magnets for the BEPCII storage ring and its interaction region are introduced. And the magnetic field measurement results are presented.

The China Spallation Neutron Source (CSNS) is a high-power, accelerator-based project currently under preparation. The accelerator complex consists of an H- ion source, an H- linac, a rapid-cycling proton synchrotron, and the transport lines. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments was started on the prototyping of several key components.

The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2 s^-1. The complex includes a polarized electron source, an undulator-based positron source, two 6.7 km circumference damping rings, two-stage bunch compressors, two 11 km long main linacs and a 4.5 km long beam delivery system. This report is Volume III (Accelerator) of the four volume Reference Design Report, which describes the design and cost of the ILC.

The general characteristics of the synchrotron radiation of the permanent magnetic wiggler, and the angular distribution of power and total power radiated for the permanent magnetic wiggler are introduced briefly. After briefly describing the basic structure of the permanent magnetic wiggler, we report the procedure of applying the finite element analysis to the C-shape frame and the integral structure which are the main bearer of the load, in order to determine the displacement of structure of magnet under different conditions. The displacement of the C-shape frame is calculated by the theoretical formula to provide a theoretical basis for further structure design and improvement of the permanent magnetic wiggler.

The formation,principle,development and unique properties of synchrotron radiation are introduced.The applications of synchrotron radiation technology are summarized in the fields of medicine,environment and industry etc.Presented recent technique tread and its development for the future.

A new in-vacuum wiggler of hybrid type was constructed for Beijing Synchrotron Radiation Facility (BSRF) .It is a 2.0 Tesla (while operation at the gap of 12mm), which will provide high flux in the hard X-ray region and will mainly be used for the high pressure diffraction experiments. The magnetic structure design, the mechanical structure design, the vacuum system and the results of magnetic field measurement of the invacuum wiggler are described in this paper. Also given is the characteristics of the synchrotron radiation of this wiggler and its compares to the current operation wigglers.

A new in-vacuum wiggler of hybrid type was constructed for Beijing Synchrotron Radiation Facility (BSRF) .It is a 2.0 Tesla (while operation at the gap of 12mm), which will provide high flux in the hard X-ray region and will mainly be used for the high pressure diffraction experiments. The magnetic structure design, the mechanical structure design, the vacuum system and the results of magnetic field measurement of the in- vacuum wiggler are described in this paper. Also given is the characteristics of the synchrotron radiation of this wiggler and its compares to the current operation wigglers.

The general features of the first in-vacuum wiggler designed and constructed in Beijing Electron Positron Collider (BEPC) as a part of the BSRF upgrade project are introduced. The measured magnetic field of the in-vacuum wiggler reaches 2.0 Tesla when operated at the gap of 12mm, which will provide high flux in the hard X-ray region and will be mainly used for the high temperature and high pressure diffraction experiments. The key technologies and difficulties for the magnetic and mechanical design of the in-vacuum wiggler are described. The main parameters and the requirements for the in-vacuum wiggler are given too. Also, the magnetic field measurement results are shown.