Speaker
Description
The Hefei Advanced Light Facility (HALF) is the fourth-generation synchrotron radiation light source under construction. The linear accelerator system in HALF will accelerate the beam to 2.2GeV to reach the required luminosity, and a low-level radio frequency (LLRF) system should be adopted to achieve a high-phase-stability RF field inside the accelerator cavities. The phase stability required for the LLRF system is better than 0.02°RMS, which is necessary to achieve high precision phase measurement inside the LLRF system. In this paper, we introduce a phase-tracking-based digital LLRF system designed for the HALF linear accelerator system. The front-end module in this LLRF system is based on high-precision phase discriminator (PD) to obtain DC signal containing the phase information of input sinusoidal waveform. Besides, a differential amplifier and a digital-to-analog converter (DAC) is applied for tracking and amplifying of the phase changes, which is in order to match the input amplitude range of the backend analog-to-digital converter (ADC), and to increase the effective number of bits (ENOB) as much as possible. A Field Programmable Gate Array (FPGA) is adopted to calculate and extract phase information and control the phase-tracking DAC. At the end, we present the test results of the LLRF system and conduct further evaluation based on actual application scenarios in the HALF linear accelerator system.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | Yes |
