J. Phys. IV France 7 (1997) C2-333-C2-334
Ultra High Harmonie Rejection using MultilayersP.W. Loeffen1, S. Müllender1, J. Goulon1, A. Filipponi1, M. Lingham1, E. Ziegler2 and E. Lüken1
1 European Synchrotron Radiation Facility, BP. 220, 38043 Grenoble cedex, France
2 European Synchrotron Radiation Facility, BP. 220, 38043 Grenoble cedex France
A novel instrument recently installed on BM29 at the ESRF has been shown to yield harmonic suppression of the order of 10-6 . It comprises two mirrors coated with W/Si multilayers which operate in Bragg diffraction mode like a second monochromator with a poor energy resolution. The device is a tunable filter with an energy band width of ~ 3 % and a total throughput of about 30 %. The harmonic suppression from the multilayers is shown to be three orders of magnitude more effective than that achieved via detuning of the monochromator crystals. The system provides an efficient way to eliminate the second harmonic transmitted from Si monochromators.
© EDP Sciences 1997