Author: Zhang, T.J.
Paper Title Page
MOPPT014 Installation and Test Progress for CYCIAE-100 61
  • T.J. Zhang, Shizhong. An, F. Yang, H. Yi
    CIAE, Beijing, People's Republic of China
  The 100 MeV high intensity compact cyclotron CYCIAE-100 being built at CIAE adopts an external ion source system, accelerates H ions up to 100 MeV and provides dual proton beams by stripping. The status at different stages, including the preliminary design*, technical design and construction preparation**, and progress***, was reported at previous conferences. The ground breaking ceremony for the building was conducted in April, 2011. Then in September of 2012, the major systems for the machine, including the 435-ton main magnet, two 46.8 kAT exciting main coils, 200-ton hydraulic elevating system with a precision of 0.02mm, high precision magnetic mapper, the 1.27m high vacuum chamber, two 100kW RF amplifiers, magnet power supplies etc., have been in place for installation. The paper will demonstrate the results of high precision machining and installation of large scale magnet, mapping and shimming with vacuum deformation, study on the multipacting effects and RF conditioning. The test results for the 18mA H ion source and injection line as well as the cryopanel and vacuum system will also be presented. The first beam is expected in the latter half of this year.
*ICCA, 2004, Tokyo, Japan
**ICCA, 2007, Giardini Naxos, Italy
***ICCA, 2010, Lanzhou, China
TU2PB01 A Study of Multipacting Effects in Large Cyclotron Cavities by Means of Fully 3-Dimensional Simulations 142
  • C. Wang, B. Ji, Y. Lei, P.Z. Li, J.S. Xing, Z.G. Yin, T.J. Zhang
    CIAE, Beijing, People's Republic of China
  • A. Adelmann, A. Gsell, M. Seidel
    PSI, Villigen PSI, Switzerland
  The field emission model and the secondary emission model, as well as 3D boundary geometry handling capabilities, are needed to efficiently and precisely simulate multipacting phenomena. These models have been implemented in OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines. The models and their implementation are carefully benchmarked against a non-stationary multipacting theory. A dedicated multipacting experiment with nanosecond time resolution for the classic parallel plate geometry has also successfully shown the validity of OPAL model. Multipacting phenomena, in the CYCIAE-100 cyclotron, under construction at China Institute of Atomic Energy, are expected to be more severe during the RF conditioning process than in separate-sector cyclotrons. This is because the magnetic fields in the valley are stronger, which may make the impact electrons easier to reach energies that lead to larger multipacting probabilities. We report on simulation results for CYCIAE-100, which gives us an insight view of the multipacting process and help to develop cures to suppress these phenomena.  
slides icon Slides TU2PB01 [7.012 MB]  
TUPPT006 The Development of Radial Probe for CYCIAE-100 165
  • F.P. Guan, Z.G. Li, C. Wang, L.P. Wen, H.D. Xie, Z.G. Yin, T.J. Zhang
    CIAE, Beijing, People's Republic of China
  In the design of CYCIAE-100 beam diagnostics system, three radial probes distribute on the mid plane. These radial probes can be used for beam centering measurement. By blocking beam on five finger target and one stopping block, the radial probe can measure the radial and axial envelope of H beam at the same time. During beam commissioning, the radial probe can also be used for beam intensity measurement. The changeable probe head design makes it possible to replace the damaged part and optimization of the structure.  
TUPPT026 The Design and Testing of an Automatic RF Conditioning System for the Compact Medical Cyclotron 209
  • Y. Lei, B. Ji, P.Z. Li, C. Wang, J.Y. Wei, Z.G. Yin, T.J. Zhang
    CIAE, Beijing, People's Republic of China
  The multipacting phenomenon for a compact medical cyclotron is induced by the fringing magnet field inside the accelerating structure. And it will become more interesting, when the vacuum system is equipped with diffusion pump. A method used for CYCIAE-14 cavity conditioning is reported together with the testing results of an automatic conditioning circuit designed on such basis. Apart from traditional Low Level RF control, in which close-loop regulation plays an important role, the automatic conditioning system emphasizes on the cavity startup process. It takes advantage of the modern digital signal processing technique, combined with the direct digital synthesizer to accurately limit the reflection, will condition the cavity by means of sweeping frequency, using the low RF driven power, in continuous wave mode. The electronics are designed and tested first; it will be used later in the RF system commissioning of other compact medical cyclotrons built by BRIF division of CIAE.  
TUPSH002 Design and Construction of Combination Magnet for CYCIAE-100 221
  • S.M. Wei, Shizhong. An, M. Li, C. Wang, M. Yin, T.J. Zhang, X. Zheng
    CIAE, Beijing, People's Republic of China
  The high intensity compact cyclotron CYCIAE-100 being constructed at China Institue of Atomic Energy (CIAE) is designed to extract proton beam from 75MeV to 100MeV in two opposite directions by stripping foil. Two combination magnets have been designed to bend the proton beams with different energies into one common beam line. The combination magnets have been designed into the return yoke of the main magnet of CYCIAE-100 for the dynamic reason. 2 D and 3D simulation of these combination magnets has been finished, the machining of them has also been finished. The magnetic field of the combination magnets has been measured and the results show that the measurements are very closed to the calculation, indicating these two magnets can be used in the BRIF project.  
TUPSH003 Conceptual Design of a 100 MeV Injector Cyclotron 224
  • M. Li, J.J. Yang, T.J. Zhang, J.Q. Zhong
    CIAE, Beijing, People's Republic of China
  Accelerator driven system (ADS) is advanced clean nuclear energy system based on a high power accelerator, which has been proposed worldwide in recent years. Referring to the experiences from the existing PSI high power proton facility, an 800 MeV cyclotron is under design at CIAE (China Institute of Atomic Energy) as a candidate of high power proton driver. Given the extremely high beam power to be extracted, a tiny beam loss can lead to disastrous result for the cyclotron. Especially, the beam loss during extraction is the critical issue with respect to the feasibility and reliability of the design, which needs to be investigated in great detail from the very beginning. In this paper, the extraction scheme and beamline elements design are presented, and the detailed beam loss distribution during extraction will be calculated by numerical simulation with the large-scale parallel code OPAL-CYCL.