Target Specifications and Performance of the ESRF Source.
Construction of the ESRF source started in 1988 as a joint project of 12 European countries. The facility consists of a 200 MeV electron linear accelerator, a 6 GeV fast-cycling booster synchrotron and a 6 GeV low-emittance storage ring optimized to produce high-brilliance X-rays from insertion devices. The project is now nearing the end of the construction phase (scheduled for July 1994), and is expecting its first external users from September 1994 onwards. All source design-goal specifications had been reached by mid-1992. This article reviews these specifications and associated basic source parameters, then discusses the actual peak performances recorded, many of them such as intensity and lifetime being well in excess of the original targets (175 mA compared with 100 mA, 42 h compared with 8 h). Current plans for upgrading, which should lead to a considerable gain in brilliance by 1995, include increasing the current to 200 mA, lowering the emittance and decreasing the coupling, improving the beam-position stability, introducing mini-gap undulators and using innovative undulator-spectrum shimming techniques.
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