Beamline overview

The photon source of the Materials Science Beamline (6.1L) is the bending magnet 6.1. We are using the soft X-ray part of the photon beam while the hard X-rays are used by the SYRMEP beamline (6.1R). The beamline is based on the SX-700 concept. For details see the Beamline description.

Prefocusing mirror

The scope of the prefocusing mirror is to bend the beam by approx. 8° in the horizontal direction and to focalize the beam vertically to the entrance slit (to maximize the transmission) and horizontally to the sample (to minimize the spot size). Because of the radiation safety the prefocusing mirror is closed in the radioprotection hutch and its position in controlled by the MSB-SLAVE computer via servomotors. By setting the prefocusing mirror position allows for compensating of the variation of the position of the synchrotron beam supped by the storage ring. The mirror is water-cooled. For details see Setting the beam position.

Entrance slit

The entrance slit aperture is set manually by a micrometer. Closing the slit improves the photon energy resolution but decreases the beam intensity. The slit is water-cooled. For details see Setting the photon energy resolution.

Monochromator

The monochromator consists of water-cooled plane mirror (PM) and plane grating (PG) with variable positions set by stepping motors controlled by the MSB-MONO computer, and of the fixed spherical mirror that is focusing the beam vertically to the exit slit (to maximize the transmission). The monochromator is supposed to be calibrated so the software sets the correct plain-mirror- and plane-grating angles in order to provide the desired photon energy of the beam. Miscalibration due to thermal and mechanical drift is more visible at higher photon energies (above 100 eV) and it can reach several eVs at 1000 eV. For details see Setting the photon energy.


Exit slit

The exit slit aperture is set manually by a micrometer. Closing the slit improves the photon energy resolution but decreases the beam intensity. The beamline provides the best results with the setting exit slit = 2 × entrance slit. For details see Setting the photon energy resolution.


Refocusing mirror

Refocusing mirror is intended for refocalization of the divergent beam coming from the exit slit. Moreover, the micrometers allow for setting of the beam position on the sample. For details see Setting the beam position.

Gold mesh

Immediately after the refocusing mirror there is a fine gold mesh placed in the beam line. It is connected to the current amplifier and A/D converter and it provides a measure of the photon flux. For details see Mesh monitor.


Last Updated on Wednesday, 15 November 2017 14:28