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The performance of the solid deuterium ultra-cold neutron source at thepulsed reactor TRIGA Mainz with a maximum peak energy of 10 MJ is described.The solid deuterium converter with a volume of V=160 cm3 (8 mol), which isexposed to a thermal neutron fluence of 4.5x10^13 n/cm2, delivers up to 550 000UCN per pulse outside of the biological shield at the experimental area. UCNdensities of ~ 10/cm3 are obtained in stainless steel bottles of V ~ 10 Lresulting in a storage efficiency of ~20%. The measured UCN yields compare wellwith the predictions from a Monte Carlo simulation developed to model thesource and to optimize its performance for the upcoming upgrade of the TRIGAMainz into a user facility for UCN physics.

V2:Performance of the solid deuterium ultra-cold neutron source at the pulsed reactor TRIGA Mainz