| Component(1) | Fraction by weight | A | Z | (Z/A) |
Density [g/cm3] |
Radiation Length [cm] |
Radiation Length [g/cm2] |
|---|---|---|---|---|---|---|---|
| Al | 0.247536 | 26.9815 | 13. | 0.48181 | 2.699 | 8.8959 | 24.01 |
| Polyimide film and glue | 0.752464 | 12.7017 | 6.35992 | 0.50072 | 1.420 | 28.5626 | 40.5590 |
| HV microcable | 16.2365 | 8.0036 | 0.49294 | 1.6087 | 21.5375 | 34.6476 |
| (1) | The weight fractions have been obtained assuming the following cable layers
(total thicness of cable = 320 μm,
effective thickness of homogeneus material for AliRoot = 305.0 μm): Al screen, 30 μm thick, Polyimide fim, 20 μm thick, Polyimide glue, 40 μm thick, Polyimide fim, 50 μm thick, Polyimide glue, 40 μm thick, Polyimide fim, 20 μm thick, Al traces, 30 μm thick, 50% of the surface, Polyimide glue, 40 μm thick, Polyimide fim, 50 μm thick, and assuming that the polyimide glue, after curing, has the same characteristics as the polyimide fime. |
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(80,"SDD HV microcable$",0.159379E+02,0.78598E+01,0.16087E+01,0.217906E+02,0.99900E+03);