1. Cluster Counting Drift Chamber as high precision tracker for ILC experiments G.F. Tassielli(1,2) (1) Dipartimento di Fisica dell’Universita’ del Salento, Italy; (2) INFN Sezione di Lecce, Italy
Cell layout at Z=0
Gas Mixture 90% Helium – 10% C4H10;
Hexagonal cells;
Cell height cm, Cell side 4-6 mm;
24 superlayers with 10 rings;
Stereo angle ±(55-210) mrad (drop δ=4cm);
µm W sense wires;
µm Al field wires;
Active volume >90%;
Radius: Inner 19cm, outer 150cm;
Spherical EndCaps (R=2.12);
Length: barrel region 300cm, total 428 cm;
Light Structure:
Gas + Wires + Inner wall are equivalent to X0 for a =90º track.
4th-Concept at
inner wall (0.001 X0) made of 200 μm carbon fiber foil covered by a 30 μm Aluminum;
outer wall (0.020 X0) made of 6 carbon fiber aluminum hexcell sandwich panels held by structural staves of unidimensional carbon fibers;
end caps (0.029 X0) made by 5 mm carbon fiber;
tt 6jets

2. Cluster Counting Drift Chamber as high precision tracker for ILC experiments
Simulation and Reconstruction made by using ILCRoot framework
Single cell spatial resolution 55 µm
Low momenta reconstruction
efficiency
Magnetic field:
DCH 3.5 T
Si detectors 5 T
Low mass advantage
(b) with first 2 clusters
(b) with first 4 clusters
(b) with all clusters
69 m
56 m
49 m
1st cluster
2nd cluster
Cluster Counting theoretically can improve single cell spatial resolution
Cluster Counting experimentally improve Particle IDentification
For 1.5 m of track the are ~ 2000 clusters :
MIN A386 (1997)