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Repetition rate multiplication capability for a high energy resolution mode of DIANA at J-PARC

Takahashi, Nobuaki; Shibata, Kaoru  ; Sato, Taku*; Arai, Masatoshi

The DIANA spectrometer is an indirect-geometry crystal-analyzer instrument which will be installed at the Materials and Life science experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). The available momentum transfer and energy ranges are from about 0.1 A$$^{-1}$$ to 3.9 A$$^{-1}$$ and from about 2 $$mu$$eV to 35 meV, respectively. Three analyzer-crystals, PG(002), Ge(311) and Si(111) are planed to put into place. The energy resolutions of each the former two analyzer-crystal setting are sufficiently high, which are about 15 $$mu$$eV and 40 $$mu$$eV, respectively. We are especially aiming very high energy resolution of about 2.5 $$mu$$eV by using the Si(111) analyzer-crystal together with another pulse-shaping mechanism, an optional setting for the DIANA spectrometer. This option can only be attained by using highly sophisticated silicone crystal, i.e. obtaining low mosaicness, and very sharp pulse-shaped incident neutron beam, which is obtained from counter-rotating 2-disk choppers with each rotation frequency of 300 Hz. Although one can attain such a high energy resolution, it is considerably inefficient to chop one very narrow incident neutron energy band from one frame (one pulse from a moderator). If several incident beam having different energy band from each other are available by chopping within one frame several times, the obtainable energy range substantially enlarge. We discuss the advantage and disadvantage of this multiplication, which is named Repetition Rate Multiplication (RRM), of the optional setting for DIANA spectrometer.

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