Dresden 2006 – scientific programme
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VA: Vakuumphysik und Vakuumtechnik
VA 4: Instruments for neutrons
VA 4.5: Talk
Monday, March 27, 2006, 16:00–16:20, HSZ 101
New facilities of the JCNS for ultra-high resolution neutron spectroscopy — •Michael Monkenbusch, Olaf Holderer, Michael Ohl, Ralf Biehl, and Dieter Richter — IFF, Forschungszentrum Juelich, D-52425 Juelich
The Jülich Centre of Neutron Science (JCNS) will in the near future supply two neutron spin-echo spectromteres to the user community. These ultra-high resolution spectrometers will be located at the new FRMII reactor and at the new MW-spallation source in Oak-Ridge. The FRMII instrument is an enhanced version of the FRJ2-NSE which is in operation at the FRJ2-DIDO reactor since 1996. With new electronics, improved correction elements and adjustment degrees of freedom it will benefit from increased flux and better neutron extraction allowing the usage of neutrons from 4.5 Å to ≃ 16 Å or longer if the intensity is sufficient. The flux gain on the sample due to reactor power and larger beam cross section will be in the range of a factor of 10. With a maximum field integral of 0.5Tm Fourier times beyond 200ns will be accessible at 13 Å wavelength. The scattering angle range extends from 20 to 900. It is planned that the instrument will be operational at the FRMII end of 2006. With a somewhat longer time horizon we are constructing a NSE instrument at the SNS spallation source in Oak Ridge. Using short fully compensated superconducting main solenoids it allows for a magnetically shielded enclosure necessary for stable and undisturbed operation. The design field integral is 1.5Tm, using a broad band of incoming neutrons a dynamical range of 1:106 will be achieved and a maximum Fourier time at 18 Å is one of the design goals.