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Campaniform sensilla (CS) of the locust proximal leg segments are arranged predominantly as homologous groups on the trochantera and femora. Their number is reduced in the more specialized jumping legs. The specific projections of the primary afferent axons from single groups of CS are visualized after backfilling them with CoCl2 introduced through the(More)
Many scientific disciplines ranging from physics, chemistry and biology to material sciences, geophysics and medical diagnostics need a powerful X-ray source with pulse lengths in the femtosecond range 1-4. This would allow, for example, time-resolved observation of chemical reactions with atomic resolution. Such radiation of extreme intensity, and tunable(More)
Experimental results are presented from vacuum-ultraviolet free-electron laser (FEL) operating in the self-amplified spontaneous emission (SASE) mode. The generation of ultrashort radiation pulses became possible due to specific tailoring of the bunch charge distribution. A complete characterization of the linear and nonlinear modes of the SASE FEL(More)
Five SASE FEL's and five spontaneous undulator systems are proposed for the FEL lab at TESLA. The SASE systems are the longest. Their total length can be in excess of 300m. In order to keep the beam size small over the whole system a strong focusing FODO lattice is needed. The parameters for the X-ray FEL's allow to separate between the undulators and the(More)
In SASE FELs, the radiation power has to saturate in a single pass through the undulator. In the VUV and X-ray regime, with undulators ranging in length from several tens to hunderds of meters, even a few percent increase in gain length could mean a lengthening of the undulator by several meters. Therefore, determining what increases the gain length is of(More)
A conceptual design study of the mechanical drive and support systems of the undulator segments for the X-ray FEL has been performed. 281 of these systems will be needed for the undulator systems. Each will support a 5m long magnetic structure. Their total length will be about 1714m. An attempt has been made to combine the contradicting requirements of high(More)