Editing LHCb experiment (section)

=== Subsystems ===
The Vertex Locator (VELO) is built around the proton interaction region.<ref>[http://lhcb-vd.web.cern.ch/lhcb-vd/default.htm] {{Webarchive|url=https://web.archive.org/web/20160303221602/http://lhcb-vd.web.cern.ch/lhcb-vd/default.htm|date=2016-03-03}}, The LHCb VELO (from the VELO group)</ref><ref>[http://lhcb-public.web.cern.ch/lhcb-public/en/Detector/VELO-en.html], VELO Public Pages</ref> It is used to measure the particle trajectories close to the interaction point in order to precisely separate primary and secondary vertices.

The detector operates at {{convert|7|mm}} from the LHC beam. This implies an enormous flux of particles; VELO has been designed to withstand integrated fluences of more than 10<sup>14</sup>&nbsp;p/cm<sup>2</sup> per year for a period of about three years. The detector operates in [[vacuum]] and is cooled to approximately {{convert|-25|C|F}} using a biphase [[carbon dioxide|CO<sub>2</sub>]] system. The data of the VELO detector are amplified and read out by the [[Beetle (ASIC)|Beetle ASIC]].
{{Gallery
  |title=VELO
  |align=center
  |File:VELO.jpg|The vertex locator (VELO) during construction.
  |File:VELO-IMG 5809-gradient.jpg|One element of VELO
}}

The RICH-1 detector ([[Ring imaging Cherenkov detector]]) is located directly after the vertex detector. It is used for [[particle identification]] of low-[[momentum]] tracks.

The main tracking system is placed before and after the dipole magnet. It is used to [[event reconstruction|reconstruct]] the trajectories of [[electric charge|charged]] particles and to measure their momenta. The tracker consists of three subdetectors:

* The Tracker Turicensis, a silicon strip detector located before the LHCb dipole magnet
* The Outer Tracker. A straw-tube based detector located after the dipole magnet covering the outer part of the detector acceptance
* The Inner Tracker, silicon strip based detector located after the dipole magnet covering the inner part of the detector acceptance
Following the tracking system is RICH-2. It allows the identification of the particle type of high-momentum tracks.

The [[electromagnetism|electromagnetic]] and [[hadron]]ic [[calorimeter (particle physics)|calorimeters]] provide measurements of the [[energy]] of [[electrons]], [[photons]], and [[hadrons]]. These measurements are used at [[trigger (particle physics)|trigger level]] to identify the particles with large transverse momentum (high-Pt particles).

The muon system is used to identify and [[trigger (particle physics)|trigger]] on [[muons]] in the events.