title: Toroidal grating astigmatism of high-harmonics characterized by EUV Hartmann sensor.
abstract: The beam transport of single high-order harmonics in a monochromator arrangement is studied. A toroidal grating combines spectral filtering and focusing in order to produce a small individual spot for each harmonic. Here, the effect of small deviations from perfect alignment is investigated. Experimentally, a Hartmann sensor monitors the EUV wavefront while the grating is subjected to an online alignment procedure. The obtained results are confirmed by a simple theoretical description employing optical matrix methods.
authors.forename: Tobias
authors.initials: T
authors.lastname: Mey
authors.forename: Sergey
authors.initials: S
authors.lastname: Zayko
authors.forename: Claus
authors.initials: C
authors.lastname: Ropers
authors.forename: Bernd
authors.initials: B
authors.lastname: Schäfer
authors.forename: Klaus
authors.initials: K
authors.lastname: Mann