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Abstract
DIANA is an indirect geometry TOF spectrometer which will be installed at Materials and Life science experimental Facility (MLF), Japan Proton Accelerator Research Complex (J-PARC). We are especially aiming at high energy resolution of about 2 μeV by using perfect crystal Si(111) analyzer together with high speed counter-rotating pulse-shaping choppers with each rotation frequency of 300 Hz as optional equipments. Although such a high energy resolution is attained, it is considerably inefficient to chop a very narrow incident energy band from one pulse period of a source. Therefore, we have varied the number of slits and have performed Monte Carlo simulations to study repetition rate multiplication (RRM) capabilities. By using the optimum 8-slit pulse-shaping choppers, 23 incident energy bands are simultaneously available from one pulse period of a source. It will give us better measurement efficiency when investigating between quasi-elastic and low energy inelastic regions of about 3 meV with high energy resolution of about 0.1%.
Acknowledgements
The authors wish to express their sincere gratitude to Prof. F. Mezei for his valuable comments about this work in January '06 at JAEA.