  The Munich 2D-ACAR spectrometer at the Maier-Leibnitz accelerator laboratory
in Garching has recently become operational. In the present implementation a
2D-ACAR spectrometer is set up, with a baseline of 16.5m, a conventional 22Na
positron source and two Anger-type gamma-cameras. The positrons are guided onto
the sample by a magnetic field generated by a normal conducting electromagnet.
The sample can be either cooled by a standard closed-cycle-cryostat to low
temperatures or heated by a resistive filament to temperatures up to 500K. We
present the key features of this new 2D-ACAR spectrometer and, in addition,
discuss first measurements on the pure metal system Cr. The 2D-ACAR
measurements have been performed on Cr at different temperatures: at 5K and at
room temperature in the anti-ferromagnetic phase and at 318K slightly above the
paramagnetic phase transition.
