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Lichtenbergstr.1
85748 Garching
SAPHiR (under construction)
Six Anvil Press for High pressure Radiography and diffraction
The instrument provides extreme pressure and temperature environments for time-of-flight neutron diffraction and neutron radiography of polycrystalline and liquid samples. The instrument shares a thermal neutron beamline (wavelength range 1-2.4 Å) with the upstream instrument POWTEX. The centrepiece is a six-ram multianvil press that is placed on a positioning and rotation table for sample adjustment, and surrounded by detectors for neutron diffraction and radiography. The six independently adjustable rams provide a combined pressing force of up to 23.5 MN (2400 tons) that is transferred via a set of smaller second stage anvils to a cubic sample assembly. A ca. 20 mm3 sample capsule can be subjected to P and T conditions of up to 15 GPa (150 kbar) and > 2000°C with the aim of increasing the pressure to >20 GPa. Aided by an anvil positioning and advancing system with a precision in the sub-micron range, samples can be deformed at strain rates varying from ca. 10-3 to 10-7 s-1 for in situ stress and strain measurements. An elliptical neutron guide with a variable supermirror coating of m = 1.5-4 will guide and focus the neutron beam between POWTEX and the press due to the sample cross-section of 3×3 mm. For radiography part of the guide can be exchanged by an absorbing end-piece; combined with different pinhole widths L/D ratios larger than 500 are attainable at reasonable neutron fluxes so that a resolution better than 100 μm can be achieved.
Neutron beam and guide
Chopper
Puls chopper frequency (POWTEX): | 200 s-1 |
Press chopper frequency: | 100 s-1 |
Chopper disc diameter: | 750 mm |
Pulse width: | 10 μs |
Collimation and flux (numerical modelling with VITESS)
TOF Detectors (current planning)
Instrument Scientists
Prof. Dr. Hans Keppler (project leader)
Phone: +49 (0)921 5537-44
E-Mail: hans.keppler@uni-bayreuth.de
Dr. Nicolas Walte (instrument scientist)
Phone: +49 (0)89 289-11772
E-Mail: nicolas.walte@frm2.tum.de
Operated by
Publications
Find the latest publications regarding SAPHiR in our publication database iMPULSE:
Gallery
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