| Paper |
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| WEPMA119 |
Control Characteristics of the PEFP RF System
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485 |
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- H.-J. Kwon, Y.-S. Cho, I.-S. Hong, H. S. Kim, K. T. Seol, Y.-G. Song
KAERI, Daejon
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A 20 MeV proton accelerator has been developed and tested at Proton Engineering Frontier Project (PEFP) as a front-end part of the 100 MeV accelerator. The initial test results showed that more stable rf operation was necessary to investigate the machine characteristics more deeply. A LLRF control system using commercially available digital board was newly developed and tested for this purpose. The goals of the rf control for 20 MeV accelerator are to achieve errors within 1 % in amplitude and 1 degree in phase against external perturbations such as the change of resonant frequency, fluctuation of klystron power supply voltage and also beam loading. In addition, the PEFP 20 MeV DTL has unique characteristics that single klystron drives four tanks simultaneously. In this paper, the initial test results of the rf system with digital controller are presented and its control characteristics are discussed.
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| WEPMA120 |
Development of the Digital RF Control System for the PEFP Proton Accelerator
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488 |
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- H. S. Kim, Y.-S. Cho, I.-S. Hong, H.-J. Kwon, K. T. Seol, Y.-G. Song
KAERI, Daejon
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The low level RF system is under development for the PEFP Proton Accelerator. The RF amplitude and phase stability requirements of the LLRF system are ±1% and ±1°, respectively. As a prototype of the LLRF, a simple digital PI control system based on commercial FPGA board is designed and tested. The main features are a sampling rate of 40 MHz which is four times higher than the down-converted cavity signal frequency, digital in-phase and quadrature detection, pulsed mode operation with the external trigger, and a simple proportional-integral feedback algorithm. The control logic is implemented in the Xilinx FPGA by using VHDL coding and the application program based on the VxWorks and VME platform is also developed. In this paper, the detailed design study and the test results of the prototype LLRF system are presented.
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