  We present Monte-Carlo simulations for the focusing design of a novel
cold-neutron triple-axis spectrometer to be installed at the end position of
the cold guide NL-1 of the research reactor FRM-II in Munich, Germany. Our
simulations are of general relevance for the design of triple-axis
spectrometers at end positions of neutron guides. Using the McStas program code
we performed ray trajectories to compare parabolic and elliptic focusing
concepts. In addition the design of the monochromator was optimized concerning
crystal size and mosaic spread. The parabolic focusing concept is superior to
the elliptic alternative in view of the neutron intensity distribution as a
function of energy and divergence. In particular, the elliptical configuration
leads to an inhomogeneous divergence distribution.
