VCXO output (sinewave) directly to J8 connector
Instead of square wave buffered/distributed by AD9510, having the VCXO output directly to the "beam clock output" (J8 connector), would allow testing the board as master oscillator for typical synchrotron light sources.
In such scenario, the phase detector/filter/ADC and FPGA-based PLL loop would be no longer needed to distribute the RF.