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(Received 17 May 2006; published 18 September 2006)The VUV and soft x-ray free electron laser FLASH (former VUV-FEL) is a user facility at DESY(Hamburg). In order to optimize the performance of the facility, an accurate characterization of theelectron beam properties is essential. The transverse projected emittance, one of the important parameterscharacterizing the quality of an electron beam, is measured using a four monitor method with opticaltransition radiation monitors. A normalized rms emittance below 2 mmmrad for a 1 nC beam has beenmeasured. In this paper we describe the experimental setup, data analysis methods, and presentexperimental results.

Measurements of the transverse emittance at the FLASH injector at DESY