| Component(1) | Fraction by weight | A | Z | (Z/A) |
Density [g/cm3] |
Radiation Length [cm] |
Radiation Length [g/cm2] |
|---|---|---|---|---|---|---|---|
| Al | 0.648690 | 26.9815 | 13. | 0.48181 | 2.699 | 8.8959 | 24.01 |
| Polyimide film | 0.351310 | 12.7017 | 6.35992 | 0.50072 | 1.420 | 28.5626 | 40.5590 |
| Hybrid microcable | 21.9649 | 10.6673 | 0.48565 | 2.0502 | 13.6703 | 28.0275 |
| (1) | The weight fractions have been obtained assuming the following cable layers
(total thicness of cable = 98 μm,
effective thickness of homogeneus material for AliRoot = 74.9 μm): Hybrid circuit Polyimide fim, 20 μm thick, Al traces, 30 μm thick, 75% of the surface, Polyimide fim, 12 μm thick, Al LV-plane, 12 μm thick, 100% of the surface chip interconnection cable Polyimide fim, 12 μm thick, Al traces, 12 μm thick, 40% of the surface, |
Calculation performed using the method described here and imposing the density of the compound.
The corresponding definition of this material in
/* $Id: AliITSvPPRasymm.cxx,v 1.70 2003/08/14 20:24:51 nilsen Exp $ */is :
AliMaterial(82,"SDD hybrid microcab$",0.218254E+02,0.106001E+02,0.20502E+01,0.137308E+02,0.99900E+03);