Electron Backscattering

Source Data

Results were obtained under ESA Contract 4000121062/17/NL/LF “Experimental Evaluation of ATHENA Charged Particle Background from Secondary Radiation and Scattering in Optics (EXACRAD)”.

Relevant contributions have been given by:

• Bernard Dirassen, ONERA, and Thierry Paulmier, ONERA, for
  experimental measurements of electron emission yield and spectra;
• Paolo Dondero, SWHARD SRL, Fan Lei, RadMod Research Ltd., Alfonso Mantero, SWHARD SRL, for simulations and data analysis;
• Simone Lotti, INAF IAPS-Roma, Silvano Molendi, INAF IASF-Milano, for coordination and project management

Results

Backscattered Number Coefficient

The absolute plots are shown below for each ion species at different angles.

Figure 1: Backscattered number coefficient for electrons through different targets.

Ratio

There is a great difference between simulation and experimental data leading to a large range of ratios:

Figure 2: Ratio of backscattered number coefficient for electrons through different targets.

Regression Statistics

The regression plots for each target is shown below:

(a)

(b)

(c)

Figure 3: Regression plots for backscattered number coefficient for electrons through different targets.