Journal Article/Contribution to a conference proceedings

PUBDB-2025-05282

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Improving stitching interferometry measurements by a continuous airflow

Van Eeckhout, A. (Corresponding author) ; Alvarez, G. ; Sics, I. ; Torras, J. ; Heinis, D. ; Nicolas, J.

2025
AIP Publishing [Melville, NY]

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Please use a persistent id in citations: doi:10.1063/5.0274516

Abstract: The stitching interferometry system of ALBA, based on a Fizeau interferometer, is robust to displacement errors and reference manufacturing errors. Nevertheless, it is very sensitive to environmental noise, particularly when measuring long mirrors. One way to reduce the impact of environmental noise is by averaging repeated measurements of the same surface area. However, averaging involves longer measurements, resulting in a compromise between time and measurement uncertainty. In this work, we explore the effect of a fan-generated continuous airflow to reduce the impact of environmental noise. In order to investigate this aspect, we evaluate the contribution of the airflow to Fizeau’s surface reconstruction repeatability, conduct a frequency analysis of the interferometric acquisitions, and perform computational fluid dynamics simulations. Finally, we replicated ALBA’s standard stitching measurement procedure, using a 550 mm section of an x-ray mirror, to assess the advantages of employing a fan with rotating blades for improving measurement repeatability.

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Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)
2. LEAPS-INNOV - LEAPS pilot to foster open innovation for accelerator-based light sources in Europe (101004728) (101004728)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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