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beamline description

Experimental station


At present we can run ambient temperature high pressure powder diffraction experiments using different types of diamond anvil cells (DAC). Typical pressure range is 0-50 GPa. 

An image plate MAR345 is used to collect the diffraction pattern.
MAR345 is placed in a stage with a precise linear movement control permetting an easy control over the distance between the sample and the image plate. Two vertical positions are curently available for the image-plate (beam center to be at the center of the active area or in the bottom corner).

Currently we welcome only those users who are ready to bring their own DAC and manage the sample loading in the DAC.

Xpress-endstation1
Xpress-endstation2
Xpress-endstation1
Xpress-endstation2




High Pressure Support Facilities


A Zeiss (Discovery V20) microscope is available for the DAC loading.

For the gasket hole drilling a Boehler microDriller (Almax easyLab) is available.  

A PACE5000 membrane pressure controller (max. He pressure 150 bar) is available with a quick fit connector for membrane driven DACs.

A BETSA PRL set up is fixed to the experimental table for monitoring the pressure through ruby fluorescence.

BETSA ruby fluorescence
PACE5000
Zeiss V20 microscope
MicroDriller</span><span style=\"font-family: monospace; font-size: medium; line-height: 20.8px;\">
BETSA ruby fluorescence






Beamline optics layout


Source

A multipole superconducting wiggler (SCW) is the source of the Xpress beamline. This source is shared with the XRD2 beamline.

A factor of 3 (14) higher flux will be obtained from SCW compared to the permanent magnet wiggler of the already present diffraction beamline (XRD1) at 12.5 keV (25 keV). The SCW also result in a smaller source size due to the shorter wiggler length (1.4 m instead of 4.5 m).  The detailed design and manufacture of the SCW has been done at the Budker Institute of Nuclear Physics, Novosibirsk. An upgrade of the original cold-bore design (with internal 20 K copper liner to efficiently absorb the thermal load from scattered photons and r.f. heating) has been done in order to reduce the liquid He consumption. The SCW has been reinstalled in July 2013 and is currently in routine operation.
The main parameters of the SCW are given in the table below: 

 Period length   64 mm
 Peak field   3.5 T 
 Total no. of poles   49
 Pole sequence  1/4, -3/4, 1, -1...
....1, -3/4, 1/4
 Internal aperture  81 mm (H) x
 10.7 mm (V)
 Total powder       18.3 kW

 


11-2 beamline overview
Mask after SCW
Superconducting wiggler
11-2 beamline overview

 



Optical elements
 

A silicon crystal (flat monochromator) hosted in the splitter chamber in the FrontEnd section of the XRD2 and Xpress - intercepts the beam from the source and direct it to the focussing mirror at fixed energy of 25 keV. The monochromator is composed of a single slab of Si with surface cut along (111) direction and cooled to LN2 temperature by a cryocooler.

cryocooler
splitter
splitter_angle
splitter_crystal






The Focussing mirror is a 1.4 m long torus, Pt coated to achieve 80% reflectivity at 25 keV and 2.9 mrad grazing angle.

mirro_foto
mirror_dimensions
mirror_draw

 


 

Ultima modifica il Mercoledì, 22 Agosto 2018 15:21