ICALEPCS2011 - List of Authors (Wang, L.)

Paper

Title

Page

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 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 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 MOPKS006 [0.091 MB]

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 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 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 MOPKS006 [0.091 MB]