Hadron Calorimeter decoding schemes
Due to various (historical, convinience, disorder) reasons
there are quite a few decoding (numbering) schemes for
DELPHI Hadron Calorimeter. This is an attempt to put
all eggs in one basket.
All coordinates are given in DELPHI frame reference, i.e.
in right ortogonal coordinate system, with X to the center
of LEP (from the pit lift),
Y - upwards,
Z - as electrons direction (from A to C,
also as a magnetic field inside the coil).
All dimensions are in centimeters.
| Geometry
| Offline
| High voltage(CAEN)
| Cathode |
The data here is from
CARGO
geometry data base.
HAC consists of 4 parts: HAB*, HAF3, HAF4, HAF1, HAF2.
The pictures shows modules names from database.
In order to investigate HAC geometry database one
could use DLIST program (with tree=geom card).
To draw detector on various graphic devices use DVP.
Detector is divided on 4 regions as Endcap A, Barrel A,
Barrel C, Endcap C. There are 24 sectors in phi,
4 layers in R(Z in Endcaps) and 96 sectors in theta.
There are 4 CAEN high voltage power supplies in rooms
A2, B3(two) and C2. One CAEN channel supplies power to
one HAC module(96 in total) with 20(19 in endcap) planes.
Hadron calorimeter barrel module contains 219 streamer tubes.
There are 12 readout crates in barrel. Each crate holds
4 64-bit input cards. Thus one crate covers 4 modules.
Crates 1-6 are for Barrel A, crates 7-12 for Barrel C.
Note that in raw data the crate number starts from 0.
The offline(DELANA) coding is module/plane/tube packed number.
1 November 1995 by
OS