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Description
In the framework of developing a high-resolution cavity beam position monitor (cBPM) and data acquisition (DAQ) system for future linear colliders, a re-entrant cBPM designed at CEA Saclay was tested at the end of the LINAC at the Accelerator Test Facility (ATF), KEK. Position and reference signals are extracted from a single broadband cavity BPM and processed through an identical front-end chain. The signals undergo analog down-conversion followed by digital signal processing utilizing a Digital Down-Conversion (DDC) algorithm.
The measured beam position was estimated using an SVD analysis of up-stream and down-stream stripline BPM data. Preliminary results demonstrate a position resolution below 15 um for a beam intensity of 0.23 nC/bunch, validating the system performance.
These experimental measurements are contrasted with theoretical predictions derived from a thorough simulation framework, including: electromagnetic (EM) simulations (CST Studio) to determine the cBPM's RF characteristics and its time-domain response to an electron bunch; and a MATLAB simulation of the complete read-out chain, which models the effects of the electronic components on the position and reference signals.
Finally, the estimated resolution is derived from these simulations, incorporating the limiting factors of thermal noise and Analog-to-Digital Converter (ADC) noise. This comparison provides essential feedback for optimizing the cBPM design and DAQ system for operational use.
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