CERN Accelerating science

Article
Title	Renovation of the Trigger Distribution in CERN’s Open Analogue Signal Information System Using White Rabbit
Author(s)	Lampridis, Dimitrios (CERN) ; Gingold, Tristan (CERN) ; Michalik, David (CERN ; Aalborg U.) ; Poscia, Aurelien (CERN) ; Serans, Miguel (CERN) ; Shukla, Mamta (CERN) ; Pereira da Silva, Tiago (CERN)
Publication	2022
Number of pages	8
In:	JACoW ICALEPCS2021 (2022) 839-846
In:	18th International Conference on Accelerator and Large Experimental Physics Control Systems, Online, 18 - 22 Oct 2021, pp.839-846
DOI	10.18429/JACoW-ICALEPCS2021-THBR01
Subject category	Accelerators and Storage Rings
Abstract	The Open Analogue Signal Information System (OASIS) acts as a distributed oscilloscope system that acquires signals from devices across the CERN accelerator complex and displays them in a convenient, graphical way. Today, the OASIS installation counts over 500 multiplexed digitisers, capable of digitising more than 5000 analogue signals and offers a selection of more than 250 triggers for the acquisitions. These triggers are mostly generated at a single central place and are then distributed by means of a dedicated coaxial cable per digitiser, using a "star" topology. An upgrade is currently under way to renovate this trigger distribution system and migrate it to a White Rabbit (WR) based solution. In this new system, triggers are distributed in the form of Ethernet messages over a WR network, allowing for better scalability, higher time-stamping precision, trigger latency compensation and improved robustness. This paper discusses the new OASIS trigger distribution architecture, including hardware, drivers, front-end, server and application-tier software. It then provides results from preliminary tests in laboratory installations.
Copyright/License	publication: © Feb 2022 by JACoW (License: CC-BY-3.0)

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