High-pressure beamline (PLANET) at the spallation neutron source, J-PARC (Invited)

Details High-pressure beamline (PLANET) at the spallation neutron source, J-PARC (Invited) High-pressure beamline (PLANET) at the spallation neutron source, J-PARC (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmmr11a..04k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #MR11A-04

Physics

[3924] Mineral Physics / High-Pressure Behavior, [3954] Mineral Physics / X-Ray, Neutron, And Electron Spectroscopy And Diffraction, [3994] Mineral Physics / Instruments And Techniques

Scientific paper

Material and Life Science experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC) will be one of the most powerful spallation neutron facilities in the world. The pulsed neutron source with a liquid Hg target is designed to be running at 25 Hz with a power of 1 MW. We have started the construction of the powder diffractometer dedicated to high-pressure experiments (PLANET) on BL-11. PLANET aims to study structures of hydrogen-bearing materials including dense hydrous minerals of the Earth’s deep interior, magmas and light element liquids. The instrument will realize diffraction and radiography experiments for powder and liquid/glass samples at high pressures up to 20 GPa and 2000 K using a large sized multi-anvil hydraulic press that can apply forces of ˜1500 ton. The instrument views a decoupled liquid H2 moderator with a cross section of 100 × 100 mm2. The primary and secondary fight paths are 25 m and 1.5 m, respectively. The 11.5-m-long supermirror guide with elliptical shape starts at a distance of 11.5 m from the moderator. Design of elliptical geometry is optimized by means of incorporating several different grade mirrors and linear approximation with planar guide in order to save cost for production without degradation of the intensity performance. The guide has a rectangular cross-section and consists of four walls coated with supermirror material. Sample is placed at 2 m from the guide exit. The 90° detectors will be installed at 1.5 m from the sample position. For the powder diffraction measurements using a multi-anvil press, an incident neutron beam passes through the vertical anvil gaps and irradiates the sample in the pressure medium. Diffracted neutrons go through the other anvil gaps at 90° direction. Half inch 3He linear position sensitive detectors with 600 mm length will be arranged horizontally and form these detector banks, which cover the scattering angle of 79° ≤ 2θ ≤ 101° and -35° ≤ Φ ≤ +35°. The spectrometer covers d spacing from 0.2 Å to 4.1 Å at 90° bank within the first frame and the resolution is less than 0.5% in Δd/d. We will overview the future of the PLANET beamline.

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