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Table 4.

Overview of STEP FS key parameters.

SSD Proton resp. Electron resp. cp1 cp2 cp3 ⟨FWHM⟩ Sensitivity
pixel (10−3 mm2 sr) (10−3 mm2 sr) (10−3 eV/ADC) (ADC/°C) (ADC) (eV) (keV)
Integral channel large pixels
0 0 0 37.1 0.953 2942 711 2.4
1 47 49 38.1 1.318 2791 669 2.5
2 56 57 36.6 0.822 2956 702 2.6
3 59 59 37.8 0.350 2976 649 2.4
4 56 57 37.0 0.968 2939 672 2.4
5 47 48 36.9 0.495 2979 708 2.4
6 49 50 37.2 0.816 2970 736 2.3
7 57 59 36.8 1.188 2886 676 2.5
8 61 62 36.8 1.260 2952 728 2.4
9 57 59 37.3 0.502 3051 656 2.1
10 49 50 37.2 0.767 3043 698 2.3
11 48 49 37.3 0.642 2815 671 2.4
12 55 56 37.3 1.241 2925 671 2.2
13 58 60 36.4 1.286 2853 691 2.4
14 55 56 36.7 1.014 2972 667 2.7
15 48 49 38.0 0.981 2980 660 2.2
Integral channel small pixels
0 0 0 36.6 0.723 2949 658 2.0
1 1.2 1.4 36.6 0.670 3032 629 1.9
2 1.3 1.4 36.3 0.743 2929 631 1.7
3 1.3 1.6 37.1 1.030 2978 622 1.8
4 1.1 1.3 36.4 0.891 3046 589 1.9
5 0.9 1.1 38.2 1.067 2890 656 1.9
6 1.2 1.4 36.1 0.771 2932 627 1.7
7 1.3 1.5 37.9 1.329 2941 689 1.8
8 1.4 1.5 36.5 0.754 3012 627 1.9
9 1.2 1.4 37.0 0.864 2936 576 1.8
10 0.9 1.1 37.3 0.695 2942 596 1.9
11 1.2 1.2 37.3 0.850 2958 581 1.7
12 1.3 1.5 36.9 0.752 2887 612 2.0
13 1.3 1.5 37.1 1.286 2894 615 1.6
14 1.2 1.4 36.9 0.879 2899 545 2.0
15 1.0 1.1 37.1 0.982 2979 645 1.6
Magnet channel large pixels
0 0 0 37.8 1.387 2834 695 2.3
1 53 0 37.5 1.264 2899 659 2.3
2 62 0 38.5 0.952 2860 654 2.4
3 66 0 38.2 0.458 3020 656 2.6
4 63 0 38.2 0.721 2939 687 2.4
5 53 0 37.5 0.678 3041 681 2.4
6 54 0 38.5 0.956 2899 669 2.2
7 64 0 37.8 1.269 3020 680 2.4
8 68 0 38.3 1.399 2797 666 2.3
9 64 0 37.5 0.696 2988 674 2.4
10 53 0 38.3 0.973 2817 658 2.4
11 51 0 38.0 0.918 2928 691 2.6
12 61 0 37.6 1.156 2898 676 2.0
13 65 0 38.0 1.245 2950 683 2.4
14 61 0 38.6 0.663 2914 686 2.5
15 51 0 38.1 1.149 2850 669 2.1
Magnet channel small pixels
0 0.0 0 36.5 0.333 2989 620 2.0
1 1.3 0 37.8 0.684 2989 604 1.9
2 1.4 0 37.8 1.115 2908 626 1.7
3 1.5 0 37.2 0.730 2962 602 1.9
4 1.3 0 38.0 1.318 2842 638 1.8
5 1.1 0 37.6 0.766 2999 601 2.1
6 1.3 0 37.0 1.084 2838 606 1.8
7 1.5 0 37.9 0.890 2919 621 1.9
8 1.5 0 38.2 1.138 3018 610 1.9
9 1.3 0 36.9 1.005 2942 590 1.9
10 1.1 0 38.5 0.931 2906 608 2.0
11 1.4 0 37.3 0.921 2913 611 1.7
12 1.4 0 38.1 0.771 2980 586 1.8
13 1.4 0 38.2 1.608 2893 580 1.9
14 1.3 0 38.4 0.727 3079 606 1.7
15 1.0 0 37.7 1.045 3026 640 2.2

Notes. The pixel numbering follows Fig. 6. The geometric response factors are listed in the second and third columns. They apply to protons and electrons with energies starting from 10 keV respectively. The temperature-correlated calibration parameters cpi for each channel are given in the Cols. 4–6. To determine the detected energy E in eV from the Analog-to-Digital-Converters (ADC) reading at a given IX-temperature T, the following formula has to be applied: E[eV]=(cp2 × T + cp3 + ADC)×cp1 with T in °C. These parameters have been derived from multiple 133Ba calibration measurements across the whole mission-expected temperature range maintaining the expected thermal gradient throughout the unit. The mean FWHMs stated in the seventh column have been derived from the 81 keV peaks of the 133Ba calibration data at multiple temperatures. The sensitivity describes the least sensitive performance of each particular channel, again taking all the aforementioned calibration data at different temperatures into account.

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