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# LHC Instability Trigger Distribution project (LIST)
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## Introduction
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The purpose of the LIST is to receive a trigger from a “cloud” of
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devices and distribute it to all relevant devices to freeze their
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acquisition buffers upon detection of the onset of an instability, with
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low and fixed latency. The LIST will be also used to distribute triggers
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between the early instability detectors and the actuators preventing
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instability growth (e.g. the Transverse Damper - ADT).
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The goal of the LIST project is to develop a network for transporting
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trigger pulses between equipment involved in the LHC beam instability
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diagnostics. The instability diagnostics system currently being designed
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at CERN will provide wideband acquisition of beam pickup signals, so
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that forming of the instabilities can be detected and studied offline.
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The hardware of the LIST nodes is based on the
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[SVEC](https://www.ohwr.org/project/svec) FMC carrier equipped with a
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[FMC TDC mezzanine](https://www.ohwr.org/project/fmc-tdc-1ns-5cha) and a
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[Fine Delay
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mezzanine](https://www.ohwr.org/project/fmc-delay-1ns-4cha).
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The gateware of it is based on a [2-core White Rabbit Node Core -
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WRNC](https://www.ohwr.org/project/wr-node-core/wiki).
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-----
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## Documentation
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- [Functional Specification](https://www.ohwr.org/documents/329)
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- [LHC Instabilities Trigger Distribution (a.k.a. the LIST), Technical
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introduction & project
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status](https://indico.cern.ch/event/295937/contribution/1/material/slides/0.pdf),
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11 March 2014
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-----
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## Design
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*Top-level system block diagram (hardware +
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software):**
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[![](/uploads/9ed001db11c3fb2a7a0a4e54d4cb6cb6/node_block_small.jpg)](/2904)
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-----
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## Contacts
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- [Erik van der Bij](mailto:Erik.van.der.Bij@cern.ch) - CERN - General
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question about project
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- Tom Wlostowski - CERN - Designer
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-----
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## Project status
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Date</strong></td>
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<td><b> Event </b></td>
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</tr>
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<tr class="even">
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<td>15-03-2013</td>
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<td><a href="https://indico.cern.ch/event/234589/">Functional Requirements on LHC Transverse Instability Diagnostics after LS1</a> meeting.</td>
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</tr>
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<tr class="odd">
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<td>04-11-2013</td>
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<td>LHC instability project scope/objectives first version written.</td>
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</tr>
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<tr class="even">
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<td>19-05-2014</td>
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<td>Functional specification written.</td>
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</tr>
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<tr class="odd">
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<td>02-03-2015</td>
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<td>LIST project installed at LHC. Being debugged.</td>
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</tr>
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</tbody>
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</table>
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-----
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23 March 2015
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