Author: Wang, L.
Paper Title Page
MOPMS028 CSNS Timing System Prototype 386
  • G.L. Xu, G. Lei, L. Wang, Y.L. Zhang, P. Zhu
    IHEP Beijing, Beijing, People's Republic of China
  Timing system is important part of CSNS. Timing system prototype developments are based on the Event System 230 series. I use two debug platforms, one is EPICS base 3.14.8. IOC uses the MVME5100, running vxworks5.5 version; the other is EPICS base 3.13, using vxworks5.4 version. Prototype work included driver debugging, EVG/EVR-230 experimental new features, such as CML output signals using high-frequency step size of the signal cycle delay, the use of interlocking modules, CML, and TTL's Output to achieve interconnection function, data transmission functions. Finally, I programed the database with the new features and in order to achieve OPI.  
poster icon Poster MOPMS028 [0.434 MB]  
MODAULT01 Thirty Meter Telescope Adaptive Optics Computing Challenges 36
  • C. Boyer, B.L. Ellerbroek, L. Gilles, L. Wang
    TMT, Pasadena, California, USA
  • S. Browne
    The Optical Sciences Company, Anaheim, California, USA
  • G. Herriot, J.P. Veran
    HIA, Victoria, Canada
  • G.J. Hovey
    DRAO, Penticton, British Columbia, Canada
  The Thirty Meter Telescope (TMT) will be used with Adaptive Optics (AO) systems to allow near diffraction-limited performance in the near-infrared and achieve the main TMT science goals. Adaptive optics systems reduce the effect of the atmospheric distortions by dynamically measuring the distortions with wavefront sensors, performing wavefront reconstruction with a Real Time Controller (RTC), and then compensating for the distortions with wavefront correctors. The requirements for the RTC subsystem of the TMT first light AO system will represent a significant advance over the current generation of astronomical AO control systems. Memory and processing requirements would be at least 2 orders of magnitude greater than the currently most powerful AO systems using conventional approaches, so that innovative wavefront reconstruction algorithms and new hardware approaches will be required. In this paper, we will first present the requirements and challenges for the RTC of the first light AO system, together with the algorithms that have been developed to reduce the memory and processing requirements, and then two possible hardware architectures based on Field Programmable Gate Array (FPGA).  
slides icon Slides MODAULT01 [2.666 MB]  
MOPKS006 Application of Integral-Separated PID Algorithm in Orbit Feedback 171
  • K. Xuan, X. Bao, C. Li, W. Li, G. Liu, J.G. Wang, L. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  The algorithm in the feedback system has important influence on the performance of the beam orbit. PID algorithm is widely used in the orbit feedback system; however the deficiency of PID algorithm is big overshooting in strong perturbations. In order to overcome the deficiencies, Integral Separated PID algorithm is developed. When the closed orbit distortion is too large, it cancels integration action until the closed orbit distortions are lower than the threshold value. The implementation of Integral Separated PID algorithm with MATLAB is described in this paper. The simulation results show that this algorithm can improve the control precision.  
poster icon Poster MOPKS006 [0.091 MB]