MicroMAX is situated at the MAX IV 3 GeV ring with an in-vacuum undulator as X-ray source (18 mm period, 2.8 m magnetic length, min gap 4.5 mm). The figure shows the main optical components: two monochromators (MLM,HDCM), focusing lenses (CRLs) and a KB mirror pair (VFM,HFM).
The first monochromator is a multilayer monochromator (MLM). It can operate in the energy range 10-14 keV with two different coatings for 0.4% or 1% energy bandwidth. The MLM can give an X-ray flux >1014 photons/s.
The second monochromator is a Si(111) crystal monochromator (HDCM). The energy range is 5-25 keV with an X-ray flux >1013 photons/s.
The beamline has four transfocators with Be lenses (Compound Refractive Lenses, CRLs) and a pair of KB mirrors (VFM and HFM), which were installed summer 2026 and are currently being commissioned. There are several different configurations that will provide different beam sizes at the sample positions. The main focusing modes are using the CRL1/CRL2 in the optics hutch, followed by either CRL3/CRL4 or VFM/HFM in the experimental hutch for the final focusing. The current CRLs-only configuration provides a focus of 10 x 5 μm2 but a beam size down to 5 μm is available. The expected focus size with VFM/HFM is 4 x 2 μm2.