CERN Accelerating science

Article
Title	Out of focus ultrafast processing of metals for reduced secondary electron yield
Author(s)	Uren, Robin (U. Dundee) ; Din, A (U. Dundee) ; Wackerow, S (U. Dundee) ; Bez, E (CERN) ; Pfeiffer, S (CERN) ; Rimoldi, M (CERN) ; Himmerlich, M (CERN) ; Taborelli, M (CERN) ; Abdolvand, A (U. Dundee)
Publication	2023
Number of pages	13
In:	Opt. Mater. Express 13 (2023) 1228
DOI	10.1364/ome.484235
Subject category	Accelerators and Storage Rings ; Chemical Physics and Chemistry
Abstract	We have demonstrated out-of-focus ultrafast pulsed laser processing of copper with a variable working distance, without the need for mechanical movement. This was achieved by employing a diffractive optical element. The method has been demonstrated in a practical application to reduce the secondary electron yield (SEY) of copper to below 1.3. We show that using an extended focus element not only increases the consistency of processing across a range of working distances, but also changes the topography of the produced structures, reducing the SEY. This presented approach shows promise in facilitating the Large Hadron Collider’s (LHC’s) upcoming high luminosity upgrade by preventing electron clouds.
Copyright/License	Publication: (License: CC-BY-4.0)

Corresponding record in: Inspire