| Component(1) | Fraction by weight | A | Z | (Z/A) |
Density [g/cm3] |
Radiation Length [cm] |
Radiation Length [g/cm2] |
|---|---|---|---|---|---|---|---|
| Al | 0.685720 | 26.9815 | 13. | 0.48181 | 2.699 | 8.8959 | 24.01 |
| Polyimide film | 0.314280 | 12.7017 | 6.35992 | 0.50072 | 1.420 | 28.5626 | 40.5590 |
| LV and signal microcable | 22.4937 | 10.9132 | 0.48517 | 2.1035 | 13.0930 | 27.5418 |
| (1) | The weight fractions have been obtained assuming the following cable layers
(total thicness of cable =148 μm,
effective thickness of homogeneus material for AliRoot = 88.5 μm): Signal cable Polyimide fim, 20 μm thick, Al traces, 30 μm thick, 50% of the surface, Polyimide fim, 12 μm thick, Al screen, 12 μm thick, LV cable Polyimide fim, 20 μm thick, Al traces, 30 μm thick, 95% of the surface, Polyimide fim, 12 μm thick, Al screen, 12 μm thick, |
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(81,"SDD LV+signal cable$",0.223689E+02,0.108531+02,0.21035E+01,0.13440E+02,0.99900E+03);