LHC Instability Trigger Distribution project (LIST)

Introduction

LIST is a general purpose trigger distribution system based on White Rabbit.* The latency between reception and transmission of a trigger is done with a low and notably fixed latency, with an accuracy of better than 1 ns. The distribution system can receive a trigger from a “cloud” of devices and distribute it to all relevant devices to for example freeze their acquisition buffers.
The hardware of the LIST nodes is based on the SVEC FMC carrier equipped with a FMC TDC mezzanine and a Fine Delay mezzanine.
The gateware of it is based on a 2-core Mock Turtle.

The first application of the LIST project is to provide a network for transporting trigger pulses between equipment involved in the LHC beam instability diagnostics.

Documentation

• Functional Specification
• Trigger and RF distribution using White Rabbit
  T. Włostowski et al., Proceedings of ICALEPCS2015, Melbourne, Australia, ISBN 978-3-95450-148-9, October 2015
• LHC Instabilities Trigger Distribution (a.k.a. the LIST), Technical introduction & project status, 11 March 2014
• Instability diagnostics, T. Levens et al.

Design

Top-level system block diagram (hardware + software)* click to enlarge

Contacts

• Tom Wlostowski - CERN - Designer

Project status

31 May 2018