| Component | Fraction by weight(1) | A | Z |
Density [g/cm3] |
Radiation Length [cm] |
Radiation Length [g/cm2] |
|---|---|---|---|---|---|---|
| Si | 0.844645 | 28.0855 | 14. | 2.329 | 9.3648 | 21.82 |
| Epotek E4110 | 0.155355 | 72.5841 | 31.9235 | 2.57022 | 4.90499 | 12.6069 |
| SDD SI CHIP | 34.9986 | 16.7845 | 2.36436 | 8.29094 | 19.5953 |
| (1) | The weight fractions depend on the effective thickness of the ASICs and of the glue. In this calculation the ASICs (PASCAL and AMBRA) are 300 μm thick and the condictive glue layer is 50 μm thick. In the real system the ASICs will have a thickness of 150 μm. |
Calculation performed using the method described here .
The corresponding definition of this material in
/* $Id: AliITSvPPRasymm.cxx,v 1.70 2003/08/14 20:24:51 nilsen Exp $ */is:
AliMaterial(7,"SDD SI CHIP$",0.374952E+02,0.178184E+02,0.24485E+01,0.76931E+01,0.99900E+03);