The B-branch is currently in the installation and commissioning phase. It is already open for expert commissioning proposals, and is expected to become available for general users for the spring 2023 cycle (March–August).
The beamline optics for the B-branch of Bloch are essentially identical to those of A-branch, but here the experimental endstation offers spin-resolved ARPES.
The analysis chamber is equipped with a PHOIBOS 150 hemispherical analyzer from Specs, with a combined 2D-CCD for regular ARPES and 3D-VLEED for spin resolution. This analyzer is capable of electronic deflection to simulate polar or tilt rotations without moving the sample. The expected energy resolution with the CCD detector is <5meV, with angular resolution <0.1°.
Measurement of all three spin vector components is accomplished with a single Ferrum VLEED detector combined with a magnetic spin-rotator lens.
Currently the analysis chamber uses a 4-axis closed-cycle cryomanipulator, with an expected sample temperature range of <20K –> 400K. Work is underway to construct and deploy a 6-axis manipulator, which we hope will be available for users in 2023.
Sample preparation by cleaving, sputtering, heating or evaporation is possible.