The VLSPGM beamline covers the far UV and ultra soft X-ray energy range, overlapping with the lower energies of the SGM beamline.
An Elliptical Polarized Undulator provides an intense beam in the 15-250 eV energy range with user-specified polarization (varying from linear polarization to circular polarization).
Measured Spot Sizes; Branch A
Measured Spot Sizes; Branch B
Results can be found in the poster: Branch B KB system commisioning result
FLUX
The beamline flux is regularly measured, at the end of both Branches (A and B), using a Si photodiode (SXUV100) located just upstream the sample positions.
Flux measurements ensure that the Insertion Device and the optical components of the Beamline are operating within the designed and commissioning expectations. Aging of the optics, carbon contamination and interference from newly added insertion devices could negatively impact the delivered flux.
Flux was measured with the Ring operating in TopUp mode (I=220mA). Red line is for Branch A; Blue line for Branch B.
Branch A
Equipped with a toroidal mirror and a differential pumped section, this branch houses the XAS chamber.
Branch B
Recently upgraded with a KB refocusing system to achive micro-spot capabilities, this branch will house the new XAS system.