Americomania and the French revolution debate in Britain, 1789-1802

This is one of several reviews of the same book to be published in this journal, to all of which the author will finally reply. Output Type: Book Revie

First observation of SASE radiation using the compact wide spectral range XUV spectrometer at FLASH2

The Free electron LASer in Hamburg FLASH hasbeenextendedwithanewundulatorlineFLASH2in 2014. Acompactgrazing incidentwide spectral rangespectrometerbasedonspherical variable line spacing SVLS gratingsintheextremeultraviolet XUV regionwasconstructedtooptimizeandcharacterize thefree electronlaser FEL performanceatFLASH2. Thespectrometerisequippedwiththree different concaveSVLSgratingscoveringaspectralrangefrom1to62nmtoanalyzethespectral characteristicsoftheXUVradiation.Wavelengthcalibrationandevaluationofthespectralresolution wereperformedattheplanegratingmonochromatorbeamlinePG2atFLASH1beforetheinstallationat FLASH2, andcomparedwithanalyticalsimulations.The first lightusingself amplified spontaneous emission fromFLASH2wasobservedbythespectrometerduringasimultaneousoperationofboth undulator lines FLASH1 andFLASH2.Inaddition,thespectralresolutionofthespectrometerwas evaluatedbycomparingthemeasuredspectrumfromFLASH2withFELsimulation