The PS system is made of two sensors, namely PS1
and PS2. Each of them is an assemby of a cubic silicon junction supported
by a mallory disc and shielded by an aluminum dome. The sensors only
differ in the thickness of the shielding dome. For each, the electronic
readout has two threshold energies set to 5 MeV ("L" channels)
and 7 MeV ("H" channels) which defines the four PS channels
named hereafter 1L, 1H, 2L and 2H. A cut view of the PS mechanical
model used for the Monte-Carlo simulation is shown in Figure 1. The
sizes of the main elements of this detector are:
The aluminum spherical bubble has a 5.15 mm inner radius and a 7.25
mm outer radius for the PS2. The outer radius of the PS1 is 16.6
The lithium drifted silicon detector is a cube with a 3 mm edge.
It is located at the center of the spherical bubble.
The 1.55 mm thick mallory disc supporting the sensor has a radius
of 5.15 mm.
The shielding aluminum structure inside the satellite was taken
into account during the simulation phase by removing particles coming
from the back side of the PS.