Powder diffraction capabilities at LANSCE

[Anna Llobet]

Dear colleagues I would like to call your attention to the powder diffraction capabilities at the Lujan Center for neutron scattering at Los Alamos National Laboratory ( http://www.lansce.lanl.gov/lujan/index.html ). Four different powder diffractometers at the Lujan Center are currently open to external users: NPDF, SMARTS, HIPD and HIPPO (see more technical information below). Beam time is allocated based on a peer reviewed proposal submission process twice a year (next deadline for proposal submission: March 14th 2005). In addition “Fast access” or "hot" science proposals are accepted all year-round and are subject to the discretion of the instrument scientist. http://www.lansce.lanl.gov/userprogram/docs/Proposal_Call_2nd.pdf ) . For information about science done on the powder diffractometers and ancillary equipment, you can contact the instrument scientist (listed below) directly. For general information regarding the user program and proposal submission, you can contact LANSCE user office by e-mail at [EMAIL PROTECTED] of by telephone at +1-(505)-665-1010. ============================================================ -NPDF : A high-resolution total-scattering neutron powder diffractometer. NPDF is designed for pair distribution function (PDF) studies of disordered and nanocrystalline materials, but it is equally well suited for high-resolution crystallographic studies. ( d-spacing range 0.12- 4A  with 0.15% to 0.31 % resolution http://www.lansce.lanl.gov/lujan/ER1ER2/NPDF/instrument/NPDF.pdf Instrument scientist: Thomas Proffen +1-(505)-665-6573  [EMAIL PROTECTED] ) -SMARTS: Spectrometer for Materials Research at Temperature and Stress. A third-generation neutron diffractometer optimized for the study of engineering materials. It provides an exciting range of capabilities for studying polycrystalline materials focusing on two areas: the measurement of deformation under stress and extreme temperature and the measurement of spatially resolved strain fields. It enables measurements on small (1 mm3) or large (1 m3) samples. Components with dimensions up to 1 m and up to 1,500 kg can be positioned precisely in the beam. (d-spacing range 0.5-4A with about 0.4 % resolution http://www.lansce.lanl.gov/lujan/ER1ER2/SMARTs/instrument/SMARTS.pdf Instrument scientist:  Don W. Brown +1-(505)-667-7904 [EMAIL PROTECTED] or Bjorn Clausen 505-667-2944 [EMAIL PROTECTED] ) -HIPD: High Intensity Powder diffractometer. It is designed to study the atomic and magnetic structure of materials that are available in polycrystalline and noncrystalline forms. HIPD is specially suited for magnetic diffraction, magnetic and crystalline phase transitions, small crystalline samples, neutron absorbing materials, studies of amorphous solids, and studies on samples subjected to extreme environments such as high and low temperature The high flux rates of HIPD also make it very useful for time-resolved and pressure studies. This instrument is currently 50% in the user program and 50% for discretionary use. (d-spacing range 0.25- 33A with 0.3 to 3% resolution  http://www.lansce.lanl.gov/lujan/ER1ER2/HIPD/instrument/HIPD.pdf Instrument scientist: Anna Llobet Megias +1-(505)-6651367 [EMAIL PROTECTED] ) -HIPPO: High-Pressure-Preferred Orientation. Over two orders of magnitude of momentum transfer are available (0.1–30 Å-1) to support studies of crystal orientation distribution (texture); amorphous solids; magnetic diffraction; small crystalline samples; and samples subjected to extreme environments such as temperature, pressure, or uni-axial stress. HIPPO has unique high-pressure cells capable of achieving pressures of 30 GPa at ambient and high (2000 K) temperatures with samples up to 100 mm3 in volume. The uniaxial stress-rig (CRATES) allows the study of crystal lattice strains and texture changes in situ during the deformation. (d-spacing range 0.12-47.5A with 0.4-5% resolution  http://www.lansce.lanl.gov/lujan/ER1ER2/HIPPO/instrument/HIPPO.pdf Instrument scientist: Sven Vogel +1-(505)-667-7016 [EMAIL PROTECTED] ) -- ==== Dr. Anna Llobet Megias HIPD instrument scientist Lujan Neutron Scattering Center, LANL MS H805, Los Alamos, NM 87545, USA Phone: +1 505 665-1367 Fax: +1 505 665-2676 Email: [EMAIL PROTECTED] http://www.lansce.lanl.gov/ http://www.lansce.lanl.gov/lujan/index.html