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Description
A read-out system comprising a local oscillator (LO) and down-conversion electronics [1] was developed to process the signals from a cavity beam position monitor (cBPM) installed at the end of the Accelerator Test Facility (ATF) linac at KEK, Japan. The cBPM [2] operates with a dipole-mode signal centered at 1.725 GHz, which must be down-converted to a lower frequency suitable for digital processing via an FPGA-embedded ADC. Preliminary tests carried out at ATF were performed by measuring the down-converted waveforms with a 2 GS/s oscilloscope.
A 1.428 GHz local oscillator was synthesized with an n-fractional PLL [3] from the 714 MHz ATF RF slave signal generator [4], for synchronization between our system and ATF bunch repetition rate, yielding an intermediate frequency (IF) of 297 MHz. Proper synchronization between the LO and RF signals was achieved, enabling consistent measurements and high cBPM resolution.
Moreover, preliminary simulations of digital signal processing using the FPGA+ADC platform is presented to demonstrate the feasibility of real-time processing with modest-resolution performance. The system will be integrated into a μTCA platform, a standard modular and scalable architecture suited for compact and reliable electronics integration.
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