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Detection efficiency of the Charged Particle Detector

The intrinsic detection efficiency of a detector channel is the ratio between the number of particles counted in that channel to the number of particles that have crossed the detector aperture. It depends on the particle type, energy and incidence angle. Figure 1 shows the angle averaged intrinsic detection efficiency of the CPD channel P11 for electrons (red), protons (green) and alpha - particles.

Figure 1.

The particle flux is considered isotropic. The efficiency function contains all the information about the characteristics of particles counted in a given channel. Such functions have been calculated using the particle transport code GEANT for all the 44 CPD channels and for the three targeted particle species. Details on the use of efficiencies to deduce fluxes may be found in Section 3.1 of Technical Note B (pdf file - 1 Mb).

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