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TARDI spectrometer

Beamline Description | TARDI spectrometer | Focusing KB | Electromagnet endstation | RIXS endstation Detectors | SLU

TARDI: on-line photon energy spectrometer

After the first plane mirror the photon beam impinges over the gratings composing the on-line spectrometer. The working scheme is similar to the already installed PRESTO and will employ two plane Variable Line Spacing (VLS) gratings respectively for the low and high energy range. The spectrometer will work at a constant grazing angle of 2 degrees in order to deliver the beam to the following components of the beamline and the diracted radiation is focused into a movable detector mounted on a X{Y stage as shown in figure 2 The low energy grating, carbon coated, will cover the wavelength range from 60.5 nm down to 6.75 nm  (from 20.5 eV to 185 eV) while the high energy grating, gold coated, will cover the wavelength range from 9.6 nm down to 1.05 nm (from 130 eV to 1180 eV) by using both the rst and second orders of diraction.

The grating proles have been designed in order to keep the diracted eciency below 2% in order to maximize the beamline transmission. The expected eciencies have been simulated by means of the code REFLEC12  for both the diracted and transmitted beams. The spot size and the resolving power at the detector have been simulated with Shadow-code13  using the Rayleigh criteria. Thanks to the high number of illuminated grooves it has been possible to reach a theoretical resolving power around 105  over almost the whole working range. In table 2 the grating parameters and the expected performances are summarized. The movable detector is expected to be a YAG screen (in vacuum) coupled with a visible CCD camera (in air). 

Last Updated on Monday, 11 November 2019 10:43