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The Proton Switch detector

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 mm.
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.

Figure 1.

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.

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