Mission Statement

CG4C is a collaboration of the Neutron Sciences Directorate at Oak Ridge National Laboratory and Institute of Solid State Physics, University of Tokyo, as part of the US-Japan Cooperative Program on Neutron Scattering. It is a cold neutron spectrometer to study static and dynamic properties of spin and lattice in materials.

Instrument Description

Of the four triple-axis spectrometers installed at HFIR, CG4C is a conventional cold neutron triple-axis spectrometer with variable incident energy and sample-analyzer distances. The cold guide 4 bender and guide hall shielding reduce background levels, and the 15-cm-tall guide profile is well exploited by CG4C′s vertically focusing monochromator (PG 002). To enhance accommodation of strong magnetic fields at the sample position and simplify future polarization analysis, the amount of ferromagnetic material has been minimized in the construction of this instrument.

Applications

CG4C is suited for high-resolution measurements of low-energy spin and lattice dynamics of crystalline solids with high signal-to-noise in materials including multiferroic materials, thermoelectric materials, high-temperature superconductors, geometrically frustrated magnets, and quantum magnets. It also can be used to study the magnetic phenomena exploring the energy range that matches achievable applied magnetic fields. CG4C can accommodate a wide variety of sample environments including high temperature furnaces (< 1770 K), ultra-low temperature cryostats (> 0.05K), vertical-field cryomagnets (< 10T), horizontal-field cryomagnet (< 6 T) and pressure cells (< 2 GPa). The materials best suited for study on CG4C facilitate power and data transmission in computers, cell phones, and power lines; impact the capacity of computer memory (hard disk); improve the efficiency of electric devices and power plants; and are vital to the eventual development of a quantum computer.

Specifications

Incident energy range: 2 - 20 meV
Final energy range: ≥3.0meV
Sample scattering angles: -15° ≤ 2Θs ≤ 115°, with additional restrictions depending on Ei
Collimation before mono-chromator: Guide dependent (40′ at 2 meV, 20′ at 20 meV)
Collimation after mono-chromator: 10′, 20′, 40′, 80′