Beamline I511 at MAX II, capabilities and performance

The new undulator beamline I511 at MAX-lab, now under commissioning, has be en optimized for X-ray emission and photoelectron spectroscopies. Using an SX-700 high flux monochromator the accessible photon energy range is from 9 0 eV to about 1500 eV. The performance of the undulator agrees very well wi th the specifications, as shown by measurements using a photodiode. The ene rgy resolution of the monochromator has been checked using absorption measu rements in a gas cell. It was found to meet the expectations and exceeds a resolving power of 10 000 at 244 eV. The photon flux as a function of energ y has been recorded as well and gives a maximum flux of 3x10(13) photons/s/ 100 mA/0.1% BW. Beamlines I511 and I411 will be the first synchrotron beaml ines making use of a so-called beam waist phenomenon, known from laser phys ics. We show results of ray-tracing calculations to determine the ultimate spot size on the sample location. The endstations to be used at this new be amline and their capabilities will be discussed as an example of the future use of this facility. (C) 1999 Elsevier Science B.V. All rights reserved.