Author/Authors :
Zeitelhack، نويسنده , , K. and Schanzer، نويسنده , , C. and Kastenmüller، نويسنده , , A. and Rِhrmoser، نويسنده , , A. and Daniel، نويسنده , , C. L. Franke، نويسنده , , J. and Gutsmiedl، نويسنده , , E. and Kudryashov، نويسنده , , V. and Maier، نويسنده , , D. and Pنthe، نويسنده , , D. G. Petry، نويسنده , , W. and Schِffel، نويسنده , , T. and Schreckenbach، نويسنده , , K. and Urban، نويسنده , , A. and Wildgruber، نويسنده , , U.، نويسنده ,
Abstract :
A sophisticated neutron guide system has been installed at the new Munich neutron source FRM-II to transport neutrons from the D2 cold neutron source to several instruments, which are situated in a separate neutron guide hall. The guide system takes advantage of supermirror coatings and includes a worldwide unique “twisted” guide for a desired phase space transformation of the neutron beam. During the initial reactor commissioning in summer 2004, the integral and differential neutron flux as well as the distribution of beam divergence at the exit of two representative and the twisted neutron guide were measured using time-of-flight spectroscopy and gold-foil activation. The experimental results can be compared to extensive simulation calculations based on MCNP and McStas. The investigated guides fulfill the expectations of providing high neutron fluxes and reveal good quality with respect to the reflective coatings and the installation precision.
Keywords :
Neutron guide , Supermirrors , Cold neutrons , neutron spectrum , neutron flux , Beam divergence
