摘要：BEPC Ⅱ, the upgrade project of Beijing Electron Positron Collider （BEPC）, is an accelerator with large beam current and high luminosity, so an efficient and stable injector is required. Several beam diagnostic and monitoring instruments are used. A new diagnostic instrument - wire scanner, has been designed and will be used to measure the profile of the linac beam of BEPC Ⅱ. This paper describes the prototype of this system and the cause of heat generating of the wire. Some simulation results of the heat and force by using finite element method software-ANSYS are presented and discussed.

摘要：The present paper describes the design and simulation results of a position-sensitive charged particle detector based on the Double Sided Silicon Strip Detector （DSSSD）. Also, the characteristics of the DSSSD and its testing result were are discussed. With the application of the DSSSD, the position-sensitive charged particle detector can not only give particle flux and energy spectra information and identify different types of charged particles, but also measure the location and angle of incident particles. As the detector can make multi-parameter measurements of charged particles, it is widely used in space detection and exploration missions, such as charged particle detection related to earthquakes, space environment monitoring and solar activity inspection.

摘要：In the Large high Altitude Air Shower Observatory（LHAASO） project,the one kilometer square extensive air shower array（KM2A） is the the largest detector array in terms of effect ive *** consists of 5635electromagnetic particle detectors（EDs） and 122 1 union detectors（MDs）.Each ED is composed of 16 scintillator tiles readout by wavelength-shifting fibers that are bundled and attached by a 25 mm *** design of the unit and its performances,such as photoelectron yield,time resolution and uniformity,are discussed in *** assembling scheme for the whole ED is established to guarantee the uniformity throughout all 16 tiles in a single ED and all EDs in mass production.

摘要：The design of the China Spallation Neutron Source （CSNS） low-energy beam transport （LEBT） line, which locates between the ion source and the radio-frequency quadrupole （RFQ）, has been completed with the TRACE3D code. The design aims at perfect matching, primary chopping, a small emittance growth and sufficient space for beam diagnostics. The line consists of three solenoids, three vacuum chambers, two steering magnets and a pre-chopper. The total length of LEBT is about 1.74 m. This LEBT is designed to transfer 20 mA of H-pulsed beam from the ion source to the RFQ. An induction cavity is adopted as the pre-chopper. The electrostatic octupole steerer is discussed as a candidate. A four-quadrant aperture for beam scraping and beam position monitoring is designed.

摘要：A proposed compact ERL test facility at IHEP, Beijing, is presented in this paper, and includes the design parameters, the essential lattice, and the key components features, such as the photocathode DC gun and the CW superconducting accelerating structures. Some important beam physics issues such as the space charge effect, the coherent synchrotron radiation （CSR） effect and the beam break-up （BBU） effect are briefly described with the simulation results.

摘要：In this paper, we the design study of a L-band DC photocathode gun injector for the ERL （energy Recovery Linac） test facility. The main parameters of the injector are energy of 2.3 MeV, a bunch length of 2 ps, and a normalized emittance of 2.1 ***.

摘要：A storage ring-based light source, Beijing Advanced Photon Source （BAPS）, is proposed to store a 5 GeV low-emittance electron beam and to provide high-brilliance coherent radiation. In this paper, we report our efforts of pushing down the emittance of BAPS to approach the so-called ultimate storage ring, while fixing the circumference to about 1200 m. To help deal with the challenge of beam dynamics associated with the intrinsic, very strong nonlinearities in an ultralow-emittance ring, a linear optics design and nonlinear optimization, such combination of several progressive technologies is used in the as a modified theoretical minimum emittance cell with small- aperture magnets, quasi-3rd-order achromat, theoretical analyzer based on Lie Algebra and Hamiltonian analysis, multi-objective genetic algorithm and frequency map analysis. These technologies enable us to obtain satisfactory beam dynamics in one lattice design with natural emittance of 75 pro.

摘要：In North China, there is a preliminary proposal for ERL-FEL light source （BXERL-FEL） with its aim at ＂one machine, two purposes＂ （the XFEL and ERL work simultaneously）. One of the key technologies is the merger section. In this paper, we give the physical design of the merger section for BXERL-FEL which merges three kinds of electron beam.

摘要：In the proposal of the Beijing Advanced Light Source, a compact combination of XERL and XFEL using a common SC linac is being considered. In the meantime, an ERL-FEL test facility is being proposed and will be used for THz radiation. In this test facility, a L-band photocathode RF injector is needed. In this paper, we give the physical design of the L-band photocathode RF injector for the test facility.

摘要：The design and optimization procedure of a pulse compressor is presented. A C-band （5712 MHz） pulse compressor using a TE0,1,15 mode cylindrical cavity with dual side-wall coupling irises has been designed. Also the coupling coefficient, position of the short plane and size of the bottom groove have been optimized by using HFSS.