Speaker
Description
Precise alignment of particle accelerator components requires stable, straight-line references over distances of several hundred meters. Pseudo-nondiffracting laser beams are promising candidates for optical-based, straight-line alignment reference systems because they maintain a narrow, high-intensity inner core over extended propagation distances. However, atmospheric fluctuations in the refractive index deflect the beam from its ideal straight trajectory, which limits the achievable accuracy. These errors are traditionally avoided using vacuum infrastructure, which adds substantial complexity to the alignment system. To eliminate the need for complex vacuum infrastructure, this work investigates a system based on dual-wavelength pseudo-nondiffracting laser beams to mitigate the angular errors caused by atmospheric refraction. We present initial experimental results obtained by directly comparing beam propagation inside a 140 m enclosed pipe under both vacuum and atmospheric conditions. We discuss the key experimental and practical challenges of this approach, highlight current system limitations, and provide a basis for future optimization toward robust operation in ambient air.
