| Paper | Title | Page |
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THPSC24 |
Fast Digital Phasemeter for Booster of NICA Project | |
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| Measurement of phase difference of two signals is widely-spread task in various regions of science and engineering. For example, in heavy ions accelerators phase difference between high frequency accelerating voltage and first harmonics of beam signal has to be measured. In this case phase measurement is complicated due to fast changing of signals frequency and amplitude. This task can be easy solved if both signals are converted in digital form and processed in FPGA. Fast phase difference meter for frequency range 0.2-6 MHz is described in this paper. The device provides phase difference measurements with measurement time ~17 microseconds and error less than 1 Degree. Signals frequency can be changed with speed up to 20 MHz/sec, signal amplitude can be changed with speed up to 40 dB/sec. A key procedure of phase meter operation is forming of two orthogonal signals on base of reference signal. During quadrature detecting the signal integration for the time equaled the integer number of signal periods is performed. It allows effectively suppress high signal harmonics. Analog electronics contains programmable gain amplifier with gain range 22-50 dB and can work in wide range of signal amplitude. Phase meter electronics features and signal processing methods are represented in this paper. Phase meter parameters and results obtained in ion accelerator are also given. | ||