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We report recent improvements and performance on the Toroidal Grating Monochromator (TGM) beamline at the Laboratorio Nacional de Luz Sincrotron – LNLS. Compared to normal incidence monochromators, (NIMs), TGMs provide substantially wider energy range, less resolving power and very poor higher harmonic rejection (HHR). A new concept, MIRHACLLE [1], developed at LNLS, allows reaching more than five orders of harmonic rejection (NIM gives 10%). Previously, we were not able to reach below 12 eV using MIRHACLLE. Here we report improvements extending the lower limit to 7.3 eV. Furthermore, HHR is maintained down to the lower limit using a special gas mixture, the upper limit given by 330 eV is kept.

Improvement on a new concept of beamline delivering high purity VUV photons starting at 7.3 eV