Synchrotron Radiation

ELSA has not been constructed as a dedicated storage ring, so mainly the vacuum system is not well suited for the needs of synchrotron radiation experiments. But nevertheless it is possible to reach internal beam currents of up to 250 mA at 1.6 GeV. Because of rf-power limitations and unsufficient cooling of the vacuum pipe (the upgrade of the cooling is still going on) the achievable current drops at higher energies (at the moment to 40 mA at 2.7 GeV), but this is sufficient for the needs of the SYLI (Synchrotron Light) group of the Physics Institute of Bonn University. Recently the closed orbit correction has been improved, yielding an rms orbit deviation (with respect to the magnetic centers of the quadrupoles) of less than 200 micrometer and a better orbit stability (< 50 micrometer). Furthermore the emittance coupling was reduced to about 1-2% and therefore the brilliance increased.

External companies and research institutes (Forschungszentrum Karlsruhe FZK - Technik und Umwelt) are also using ELSA as a source of synchrotron light, mainly for applications in the area of micromechanics and microfabrication.

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