MuonGeoModel and MuonSurfaces

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Title: MuonGeoModel and MuonSurfaces

1
MuonGeoModel and MuonSurfaces

MuonGeoModel-00-02-80
For TGC, RPC and CSC 2 (one for the phi view,
one for the eta view) plane surfaces are
associated to each gas gap Rectangular bounds
are used for RPC, Trapezoidal Bounds (Rotated
Trapezoidal Bounds) for phi (eta) surfaces in TGC
and CSC
Transforms are defined in such a way that
for a phi strip TrklocalPosition is (xvarying
with strip , 0const Local Eta)
for a eta strip TrklocalPosition is (yvarying
with strip , 0const Local Phi)
This (MuonGeoModel-00-02-80) is a follow up of
the most urgent requirements of generic track
fitters discussed on the common tracking meeting
of Oct 17, 2006 slides from Ed (pages 11-13)
two surfaces approach
http//indico.cern.ch/conferenceDisplay.py?confId
7400
In the previous discussion the possibility to
benefit of the use of LocalParameters (where the
parameter definition is strictly necessary, no
need to rely on conventions like phi is first or
the measurement is first) was raised for
several reasons, it was felt the proposal was not
convincing enough !
SinStereo a somewhat less urgent business
discussed in the same meeting
TGC phi strips are not parallel to each other
but almost pointing
The various proposals are collected in
http//indico.cern.ch/conferenceDisplay.py?confId
7400 (pages 8-10)
sinStereo as a methid of TrkDetElementBase
Rotated error matrix
Disc surface with trapezoidal bounds for TGC phi
strip position represented by phi and 1D error
matrix (this was considered the most elegant
solution)

2
MuonGeoModel and MuonSurfaces

Ive been trying to move for TGC from plane
surfaces with trapezoidal bounds to Disc Surfaces
with trapezoidal bounds
The difficulties are
Disc surfaces have never really been used as
surfaces associated to detector elements
(however, they are used a lot in the description
of cylinders in the Muon Tracking Geometry by
Sharka sw needed for holes-on-track, for
example)
Some extra development is needed in DiscSurface
to allow the Disc reference point (center of the
cylindrical symmetry) to be different that the
center of the surface
Some extra discussion is needed because the
LocalPosition of a phi strip will be given by
(Rconstant, phivarying with strip ) i.e. the
measurent will again come in second slot a
preliminary collection of options and
considerations (by Ed, Andy, Markus, Wolfgang)
modifying the order of local coordinates for
discs (R,phi)-gt(phi,R) looks un-natural and it
would impact on a lot of central tracking
software
Working with LocalPositions for TGC in the form
(R, phi) will need detector dependent new code
for ROT creators and local-pattern-recognition
A new kind of surface trapezoidal surface,
meeting just from the design the requirements and
constraints coming from really-trapezoidal
surfaces ???