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Instrument Cg4c

For more information, contactPrincipal Investigator: Steve Shapiro, shapiro@bnl.gov, 631.344.3822 Principal Investigator: Hideki Yoshizawa, yoshi@issp.u-tokyo.ac.jp Instrument Scientist: Tao Hong, hongt@ornl.gov, 865.574.8659 http://neutrons.ornl.gov/instruments/HFIR/CG-4C.shtml The US/Japan Cold Neutron Triple-Axis Spectrometer is a conventional triple-axis spectrometer with variable incident energy and variable monochromator-sample and sample-analyzer distances. The cold guide 4 bender and guide hall shielding reduce background levels at CG-4C, and the 15-cm-tall guide profile is well exploited by CG-4C's vertically focusing monochromator (PG 002). To enhance accommodation of strong magnetic fields at the sample position and to simplify future polarization analysis, the amount of ferromagnetic material has been minimized in the construction of this instrument.

CG-4C is a collaboration of the Neutron Scattering Science Division at Oak Ridge National Laboratory, the Neutron Scattering Group at Brookhaven National Laboratory, and the Neutron Science Laboratory, Institute for Solid State Physics, at the University of Tokyo.

Applications High-resolution measurement of low-energy excitations with high signal-to-noise ratios due to the low background Studies of magnetic phenomena, exploiting the energy range that matches achievable applied field at sample 06-G01638D/gim Specifications Incident energy range (PG 002) 2 20 meV Final energy range (PG 002) >2.8 meV Sample scatter angular range Geometry dependent (<160 ) Collimation before mono- chromator Guide dependent (40' at 2 meV, 20' at 20 meV) Collimation after mono- chromator 10', 20', 40', 80' March 2010 Status: To be commissioned in 2010

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