BACH

BACH - Beamline for Advanced diCHroism

card

More information on the post doc position (pdf file)
 

BACH delivers a photon beam with high intensity and brilliance in the soft x-rays energy range (35 - 1600 eV) with the full control of the polarization of the light . The goal of this project is the realization of electronic and photon spectroscopy experiments with polarization dependence. The following techniques are implemented: XPS (X-ray Photoelectron Spectroscopy), UPS (Ultraviolet Photoelectron Spectroscopy) , XAS (X-ray Absorption Spectroscopy), XMCD (X-ray Magnetic Circular Dichroism), XMLD (X-ray Magnetic Linear Dichroism), SXES (Soft X-ray Emission Spectroscopy), RXES (Resonant X-ray Emission Spectroscopy).

The radiation source is based on two APPLE-II elliptical undulators that are used alternatively in order to optimize the flux.
More information on the Energy Ranges of the two Undulators here

The photons dispersion system is based on the Padmore VASGM (Variable Angle Spherical Grating Monochromator) scheme and it includes four different interchangeable spherical gratings. The first three gratings guarantee resolving powers of 20000-6000, 20000-6000 and 15000-5000 in the energy ranges 35-200 eV, 200-500 eV and 500-1600 eV respectively.
More information on the Energy Ranges of the four gratings of the Monochromator can be found here

Three separate branches, following the monochromator, allow setting three independent experimental chambers.
The flux on the experimental samples, at the best resolutions achievable, is above 10¹¹ photons/s with linearly or circularly polarized light.
In addition a fourth grating operates in the 400-1600 eV range providing higher flux (10¹² photons/s) with smaller resolving power (10000-2000), allowing fluorescence and x-ray scattering experiments.

The two refocusing sections, based on plane elliptical mirrors in a Kirkpatrick - Baez configuration, provide nearly aberration free spots on the samples. The theoretical dimensions are 200x15 micron² (Horizontal x Vertical) and 300x30 micron², respectively.

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::. Useful Phon Numbers

::. Technical Details for Users

::. How To Apply For a Beamtime

::. How to reach Elettra

download BACH card (PDF file)

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