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Yang, J.

Paper Title Page
MOPAN057 LabVIEW and MATLAB-Based Virtual Control System for Virtual Prototyping of Cyclotron 281
 
  • Y. Q. Xiong, M. Fan, B. Qin, M. J. Wu, J. Yang
    HUST, Wuhan
  
  Funding: This work is supported by National Nature Science Foundation of China under Grant 10435030

A virtual control system designed to control and monitor the process of a cyclotron virtual prototyping is presented in this paper. Based on the feature of cyclotron, a distributed control structure is proposed according to the knowledge of software engineering. LabVIEW is employed to develop human machine interface(HMI), sequential control, safety interlock, and MATLAB is used to implement analysis and simulation. Dynamic data exchange (DDE) supported by Win32 Platform SDK is adopted to process data exchanging by a Server/Client mode. Any additional functions can be extended easily in this system in future.

 
THPMN036 Simulation Study on Attosecond Electron Bunch Generation 2796
 
  • K. Kan, T. Kondoh, J. Yang, Y. Yoshida
    ISIR, Osaka
  
  Pulse radiolysis, a stroboscopic method with an ultrashort electron bunch and an ultrashort light, is essential for the observation of ultrafast reactions. The time resolution of pulse radiolysis depends on the electron bunch length. In Osaka University, a 98-fs electron bunch was generated by using a photocathode electron linac for a development of femtosecond pulse radiolysis*. Furthermore, a sub-femtosecond/attosecond pulse radiolysis will be proposed to study the ionization and thermalization processes in attosecond time region. In order to realize such a high time resolution, the possibility of attosecond electron bunch generation based on the photocathode RF gun linac and a magnetic bunch compressor was studied. In the simulation, the bunch length growth due to charge, emittance, accelerating phase and magnetic fields were investigated to generate an attosecond electron bunch.

* J. Yang, T. Kondoh, K. Kan, T. Kozawa, Y. Yoshida and S. Tagawa: Nucl. Instrum. Methods Phys. Res., Sect. A 556 (2006) 52-56

 
THPMN037 Development of Compact EUV Source based on Laser Compton Scattering 2799
 
  • S. Kashiwagi, R. Kato, J. Yang
    ISIR, Osaka
  • R. Kuroda
    AIST, Tsukuba, Ibaraki
  • K. Sakaue, M. Washio
    RISE, Tokyo
  • J. Urakawa
    KEK, Ibaraki
  
  High-power extreme ultraviolet (EUV) source is required for next generation semiconductor lithography. We start to develop a compact EUV source in the spectral range of 13-14 nm, which is based on laser Compton scattering between a 7 MeV electron beam and a high intensity CO2 laser pulse. Electron beam is pre-bunched using two different wavelengths of laser pulses with a dispersion section of beam transport line*,**. In this conference, we describe the results of numerical study for the EUV source and a plan of test experiment generating micro-bunched electron beam.

*M. Goldstein et al., Proc. of the 27th Int. FEL conference, Stanford, California, USA (2005) pp.422-425**A. Endo, Sematic EUV source workshop, Barcelona, Spain (2006)

 
THPMN038 Dynamic Optical Modulation of the Electron Beam for the High Performance Intensity Modulated Radiation Therapy 2802
 
  • T. Kondoh, H. Kashima, J. Yang, Y. Yoshida
    ISIR, Osaka
  
  Radiation therapy attracts attention as one of cancer therapies nowadays. Recently, the radiation therapy of cancer is developing to un-uniform irradiation as IMRT, for reduce dose to normal tissue and concentrate dose to cancer tissue. A photo cathode RF gun is able to generate a low emittance electron beam pulse using a laser light pulse. We thought that a photo cathode RF gun can generate intensity modulated electron beam by optical modulation at the incident optics dynamically. Because of a low emittance, the modulated electron beam pulse is able to accelerate keeping shape. Accelerated electron pulses will be converted to X-ray pulses by a metal target bremsstrahlung method or by a laser inverse Compton scattering method. For the high performance intensity modulated radiation therapy (IMRT), dynamic optical modulation of the electron beam pulse were studied using a Photo cathode RF gun LINAC. Modulated and Moving electron beam will be reported.  
THPMN039 Femtosecond Electron Beam Dynamics in Photocathode Accelerator 2805
 
  • J. Yang, K. Kan, T. Kondoh, Y. Yoshida
    ISIR, Osaka
  
  Ultrashort electron beams, of the order of 100 fs, are essential to reveal the hidden dynamics of intricate molecular and atomic processes in nanofabrication through experimentation such as time-resolved electron diffraction and femto-chemistry. The transverse and longitudinal dynamics of ultrashort electron beam in a photocathode linear accelerator were studied for femtosecond electron beam generation. The emittance growth and bunch length increase due to the rf and the space charge effects in the rf gun were investigated with the laser injection phase. The dependences of the emittance, bunch length and energy spread on the bunch charge were measured experimentally and compared with the theoretical simulation. The increase of the bunch length due to the space charge effect was also investigated during the bunch compression in magnetic field.  
THPAN056 Design Study of Compact Cyclotron Magnets in Virtual Prototyping Environment 3354
 
  • B. Qin, M. Fan, Y. Q. Xiong, Y. Xu, J. Yang
    HUST, Wuhan
  
  Funding: This work is supported by National Nature Science Foundation of China under Grant 10435030.

An intelligent magnet design, modelling and optimization method with the aid of beam dynamics analysis and three dimensional magnetic field calculation is introduced. The whole procedure is implemented in an integrated virtual prototyping environment built with python language. As a case study, the main magnet design of a 16MeV H- compact cyclotron is illustrated. Both the field isochronism and transversal focusing of the beam can be fulfilled, and the mechanical analysis is performed to validate the feasibility in mechanics.