OT Naming Convention
FE Channels
As discussed in the
Introduction ,
the OT is geographically subdivided in:
- 3 stations: T1, T2, T3;
- 4 layers: L0 (X), L1 (U), L2 (V), L3 (X);
- 4 quarters: Q0, Q1, Q2, Q3.
(This scheme is illustrated in detail in the LHCb note
LHCb-2003-041.)
Here an overview of the channel numbering scheme is given.
This is determined by the channel sequence in the
OTIS , folded with the
numbering scheme of the four OTIS Boards on the
FE Box.
Since all 408 FE Boxes (128 channels) on the OT detector
have identical construction, their geometrical positions influence
the channel numbering:
-
unplugging and taking a FE Box out of the top side of a module
and plugging it in the bottom side of the same module implies an 180
degrees rotation around the Z axis;
-
analogously,
unplugging and taking a FE Box out of a module
and plugging it in the corresponding module in the layer right behind
implies an 180 degrees rotation around the Y axis.
The description of the channel numbering scheme can be found in:
The conversion between the channel address
as specified in LHCb-2003-041 and the straw numbering scheme
used by the OT reconstruction can be performed on the basis of
the channel address
[quarter, layer, otis, otis_channel]
that is carried by the data itself
(see
EDMS 833984).
Two possible implementations are given below: