39 research outputs found

    Study of the transverse coherence at the TTF free electron laser

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    Double slits with different separations, crossed slits and circular apertures have been used to study the transverse coherence of the VUV light of the SASE Free Electron Laser at the TESLA Test facility at DESY. The resulting diffraction patterns are converted to visible light by a Ce:YAG crystal and imaged by a high-resolution CCD camera. The visibility of the diffraction patterns indicates a high degree of transverse coherence. Measurements have been taken at various operating modes and wavelengths of the FEL. A numeric FEL simulation code has been used to calculate the wavefronts of the light at the exit of the undulator. By propagating the wavefronts through the optical setup, the diffraction at the double slits is computed with the code GLAD. Good agreement with the measurements is found

    Measurements with an MSGC Hodoscope Using the PreMux128 Frontend Chip

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    We report on the performance of a hodoscope containing 3 large area micro strip gas chambers ( MSGCs). The results of the measurements in a test beam experiment and with cosmics rays are presented. As counting gas Ar/Propan ( 60/40) and Ar/DME ( 50/50) provided by a closed gas system that recycles and purifies the gas was used. The detectors were equipped with the PreMux128 chip, a multiplexer chip using double correlated sampling for signal processing. The influence of this method for the operation with MSGCs is discussed

    Study of the weak charged hadronic current in b decays

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    Contains fulltext : 26278.pdf (publisher's version ) (Open Access

    Search for unstable sequential neutral and charged heavy leptons in e(+)e(-) annihilation at root s=130 and 136 GeV

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    Contains fulltext : 26249.pdf (publisher's version ) (Open Access

    Cannabis & mental health: key facts leaflet.

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    The Royal College of Psychiatrists have produced online leaflets for the public. They include useful, basic information

    A Measurement of Tau Polarization in Z0 Decays

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    Contains fulltext : 26841___.PDF (publisher's version ) (Open Access
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