Web Content Display
SOLARIS centre
Breadcrumb
Web Content Display
The first light from the UARPES undulator
In May 2016, the first light from the variably polarizing undulator (APPLE II type) installed on the UARPES beamline has been observed at the sample position, in the experimental chamber.
On our image the "footprint" of the synchrotron "light" (the ultraviolet of the photon energy 140 eV) on a luminescent YAG screen is visible. We can seen there: a central spot of the size of about 5 mm in diameter and a ring of 6 mm radius. They have been measured at an effective distance of 16 m from the source. They correspond perfectly to the theoretically predicted diffracted beams of the undulator fundamental harmonic radiation. The electron energy is 1.5 GeV, the undulator gap is 100mm. For these settings it is expected that the 0-order diffraction beam appears circularly symmetric and having a divergence of 0.12 mRad FWHM while the 1-order diffraction ring is observed 0.37 mRad away from the beam axis. Photo: Jacek Kołodziej
The UARPES beamline has been designed in cooperation with specialists from Italian synchrotron Elettra. Elliptically polarizing, APPLE-II type undulator is a radiation source. Angle-Resolved Photoelectron Spectroscopy (ARPES) allows for measurements of fundamental quantities, i.e. the energy and the momentum, describing a photoelectron state in the space outside the solid sample. The importance of the ARPES technique for contemporary science and technology is widely recognized. Dedicated ARPES beamlines exist at almost all synchrotron radiation centers worldwide.
Edoardo Busetto and Marco Peloi from ELETTRA assisted SOLARIS staff during the first days of the beamline commissioning.
Modification date 09/04/2022
- Agnieszka Cudek
Recommended
