A polypropylene foil was used as the entrance window.
2.
The central part of the counter body was made of 0.51 mm thick beryllium and served as the X-ray entrance window.
3.
However, this is not possible for apertures over 1 meter, at which the pressure difference at the entrance window of the vacuum tube becomes too large.
4.
For transformation of the " ( x, y ) " information into scattering angle " ? " a removable calibration mask in front of the entrance window is used.
5.
The LECS was similar to the MECS units, expect that it had a thinner window that allows photons with lower energies down to 0.1 keV ( 16 aJ ) to pass through and operated in a " driftless " mode which is necessary to detect the lowest energy X-rays as these would be lost in the low field regime near the entrance window of a conventional GSPC . The LECS data above 4 keV ( 641 aJ ) is not usable due to calibration issues probably caused by the driftless design.
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