Work

First steps toward the development of a straight-line reference alignment system for future accelerators at CERN using pseudo-nondiffracting Layer beams

Year: 2025

Type: article

Abstract: This paper presents experimental results that allow for the performance evaluation of a straight-line reference alignment system based on pseudo-nondiffracting Layer beams (LBs). Sensors, developed specifically for this system, feature four linear CMOS chips and a square aperture. This allows for simultaneous measurements along the beam path without disrupting the laser reference. Measurements, conducted over a distance of 2 m from the first to the last sensor, were compared with state-of-the-art alignment techniques to assess the system performance. The alignment reference generated by the LBs exhibited a repeatability and reproducibility root-mean-square error (RMSE) of less than 30 μ m . The relative alignment precision for a known displacement was validated with a standard deviation of 4.3 μ m . The results demonstrate the potential for scaling the system to longer distances. The key sources of noise that must be addressed before such scaling can be realized are identified. Additionally, a proof-of-concept for future development of a radiation-hard sensor utilizing optical fiber matrices is demonstrated. The RMSE of the reference position detection introduced by the fiber matrix remained below 1.3 μ m . This would allow the sensor to be used reliably in high-radiation environments typical for accelerator facilities. This study serves as a foundational step toward developing a straight-line reference alignment system based on pseudo-nondiffracting LBs intended for deployment in the accelerator facilities.

Source: Measurement Science and Technology

DOI: 10.1088/1361-6501/ae0ba0