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ST Detector Description

The aim of the ST detector description is to have a detailed implementation of the active and inactive elements in the detector. It is an interface to both the geometry, readout mapping and the conditions of the ST. It should also allow alignment studies to be easily performed.

Updated description of the Silicon Tracker detector element tree, M.Needham, LHCb-2008-046 (internal)
This note replaces The Silicon Tracker detector element tree, M.Needham, LHCb-2006-034 (internal [now obsolete])

Geometry

The most recent TT detector description can be found in LHCb note 2008-061. Older notes are LHCb-2006-032 and LHCb-2004-110.
The Inner Tracker detector description and its implementation in the XML database, A.Perrin, K.Vervink, LHCb-2006-018 (public)
Stereo angle conventions
IT box orientation gif fig
Opening the IT in software

Material budget

The most recent TT material scans are found in note 2008-061. Therein a comparison is made between DC06 (eta-scan, eta-phi-scan, x-y-scan) and DC08 (eta-scan, eta-phi-scan, x-y-scan).
The original calculation of the TT material budget from the design drawings can be found in LHCb note 2005-020.
The excel spreadsheet used in the calculation and the XML catalog TTMaterials.xml can be found here.

The most recent IT material scans are contained in LHCb note 2008-054. Therein is an eta-phi scan of the whole IT region using the latest 2008 geometry and an eta-scan comparing the DC06 (in red) and the July 2008 (in black) geometries.
More information on the details of the IT box and station material budget calculations

Dead strip list

The known dead strips are included in the conditions database. In the future this list will be used to configure the TELL1. Information on dead strips is also used in the reconstruction. Initially, the conditions database will be populated with known dead strips from the burn-in tests. Thereafter, the condition database will be compared to real data and updated accordingly. The code that searched for dead strips and makes the comparison is described on the STVetraAnalysis Twiki.

Dead strip definitions
TT list of bad channels from the production database. This list is converted to the conditions database using two python scripts.
IT dead strip list (xls) from module tests (July revision). Replaces this old list (xls).

Geometry surveys

The information from the geometrical surveys is put in the alignment conditions database as an starting point for the software alignment using real tracks.

TT: LHCb note 2008-061 describes the implementation of the surveys in the database. The metrology data of the sensors is obtained from the production database. The photogrammetry data of the balconies is obtained from two EMDS notes (856161 and 857679). Both datasets are converted using python scripts.
IT: The cable survey and its implementation in the conditions database is contained in LHCb note 2008-055. This cable description is implemented in the 2008 geometry, which can be compared with the DC06 geometry.

ST channel numbering

The channel numbering and readout partitioning for both the IT and TT are defined in LHCb-2007-137 and are also described in the links below

TT Sector Numbering and readout mapping
IT Sector Numbering and readout mapping
The readout map is obtained from Genx algorithms. See this zip file.
Note that currently in the readout map the orientation tag and service box mapping is added by hand.

LHCb geometry and conditions database

The geometry database (DDDB) and Conditions (CondDB) are now in an SQLite database. Manipulation of the XML is done via for the SQLite files, either by exporting an XML database or by a GUI.

Wiki on the SQLite database. Read this before you edit XML !
The backend for the detector description and its conditions is XML. Hints and Tips on XML from Matthew Needham.

Last modified: Thursday 14th 2009f May 2009, 16:14 email: address