1.49 keV line

The 1.49 keV beamline shares the BEaTriX architecture and the same Optical Chamber as the 4.51 keV one. A microfocus X-ray source with anode in Aluminum is positioned at the focus of a grazing incidence paraboloidal mirror for beam expansion in the vertical direction. Two asymmetrically-cut Quartz (10-10) crystals are used as monochromator, and two Ammonium Dihydrogen Phosphate (ADP) crystals asymmetrically cut with respect to the (101) crystal planes are used for the beam expansion by a factor x40.
The realization of this line is now (2026) in advanced phase: all the optical components (parabolic mirror, two asymmetrically-cut Quartz crystals for the monochromator, two ADP crystals for the beam expander) have been procured and characterized; their dedicated manipulators have been assembled, aligned, and integrated in BEaTriX; while the X-ray source is undergoing its final tests. The expcted beam performances, under the assumption of a source brilliance of 5 x 1011 ph s^-1 sterad^-1, are a flux of ∼12 ph s^-1 cm^-2, a horizontal HEW of 3.6 arcsec and a vertical HEW of 1.2 arcsec, over a 133 x 60 mm2 footprint, compatible with the NewAthena PSF acceptance test.
The commissionig of this line is expected to be completed in early 2027.