Open Access
Table 1
Specifications of WFM relevant for imaging.
| Item | Parameter | Value |
|---|---|---|
| Mask | Physical size | 260.0 mm × 260.0 mm × 0.15 mm |
| Pattern | 1040 × 16 elements of 0.25 × 16.4 mm2 (the latter encompassing 2.4 mm ribs and 14.0 mm open areas) | |
| Material | Tungsten 0.15 mm thick (<0.3% transparent for E<30 keV) | |
| Detector | Type | 4 Silicon drift detectors in a 2 × 2 array each |
| Size | 77 mm × 72 mm × 0.45 mm each | |
| Boundary of combined sensitive area | 158 × 153 mm2 | |
| Quantum efficiency | >97% for E<10 keV, >33% for E<20 keV | |
| Position resolution (FWHM) | <60 µm along X and <8 mm along Y | |
| Energy resolution (FWHM) | <300 eV at 6 keV | |
| Foils | Thickness multi-layer insulator above mask | 12.70 µm kapton + 0.10 µm Al + 0.15 µm SiO2 |
| Thickness micrometeorite protection | 15 µm polypropylene | |
| Geometry | Mask-detector distance | 203.05 mm (from top mask surface to top SDD surface) |
| FOV | 90 × 90 square degrees (29 × 29 square degrees FCFOV) | |
| Angular resolution (FWHM, on axis) | fine 4.4 arcmin, coarse 4.6 deg | |
| Data | Photon positions | on detector full resolution (unbinned) |
| Time binning | 10 µs nominal | |
| Photon energy binning | 1024 channels |
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