First Data from the ASTRAIOS 190 2D-CMOS

First tests of the recently finished ASTRAIOS 190 2D-CMOS has proven the high precision and superior technology of the single spot shifting lens for ARPES deflection experiments. First results, performed with a test aperture, using the ±20° wide angle mode are presented here. The emission spot size was 30µm, using a thin wire exposed to an electron source. The result of the test aperture scan is shown in the measurement below: Each dot is an electron beam, recorded at a fixed kinetic energy after passing through the test aperture from the exposed wire below. The electrons enter the analyzer at a defined angle. Each spot corresponds to an angular step of 1.5° starting at 4° off the central line with a width of 0.23°. The green circle corresponds to the emission angle of ±20°. The y-axis is the on energy channel axis of the detector, e.g. the angular dimension along the entrance slit. The x-axis is the deflector scan direction, representing the second angular emission direction accessible via the shifting lens scan.