Title :
FPGA implementation of a prototype PI Feedback control system for the LANSCE accelerator
Author :
Kwon, Sungil ; Castellano, L. ; Prokop, M. ; Torrez, P. ; Scheinker, A.
Author_Institution :
Accel. Oper. & Technol. Div., Los Alamos Nat. Lab., Los Alamos, NM, USA
Abstract :
The current LANSCE LLRF system is an analog PI Feedback control system which achieves amplitude and phase error of 1% and 1 degree respectively. The feedback system receives cavity amplitude and phase, crosstalk between the amplitude and phase paths is significant. We propose an In-phase (I) and Quadrature (Q) based feedback control system which easily decouples the crosstalk of the I and Q channels. A PI feedback controller is implemented with an Altera Stratix III FPGA. The control system is modeled with DSP Builder which automatically generates HDL. Altera SOPC Builder is used for the hardware integration of the DSP Builder model, memories, peripherals, and 32 bit NIOS II embedded processor. The NIOS II processor communicates with the host computer via Ethernet, uploads data, computes parameters, and downloads parameters. The network support of the design makes it possible to set and tune the control system parameters on-line and to conduct the calibration of the whole RF system easily. The proposed control system is successfully tested with a LANSCE sided-coupled linear accelerator at 720kw.
Keywords :
PI control; accelerator control systems; control engineering computing; digital signal processing chips; field programmable gate arrays; linear accelerators; local area networks; neutron sources; state feedback; Altera SOPC Builder; Altera Stratix III FPGA; DSP builder; Ethernet; FPGA implementation; LANSCE LLRF system; LANSCE accelerator; NIOS II embedded processor; feedback system; hardware integration; prototype PI Feedback control system; Cavity resonators; Clocks; Control systems; Digital signal processing; Field programmable gate arrays; Finite impulse response filter; Radio frequency;
Conference_Titel :
Control Applications (CCA), 2011 IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
978-1-4577-1062-9
Electronic_ISBN :
978-1-4577-1061-2
DOI :
10.1109/CCA.2011.6044415