International Workshop on Accelerator Alignment 2026

Session

Instrumentation I

6 Oct 2026, 18:30

Middle Hall 200 (Tsukuba International Congress Center)

Conveners

Instrumentation I

• David Martin (ESRF)

23. A hybrid ADM–IFM system for air refractive index compensation with a target uncertainty of 5 µm (k=1) up to 100 m (TUO16)

Joffray Guillory (Laboratoire Commun de Métrologie LNE-Cnam)

06/10/2026, 18:30

In IWAA 2024, we presented an absolute distance meter (ADM) for long-range measurements, achieving uncertainties below 1 mm (k=1) over distances of up to 12 km. This instrument uses two laser wavelengths, one in the visible and the other in the infrared, to measure the difference in optical path length between them. This additional measured quantity corresponds to the accumulated effect of the...