Patent ID: 6765197
Filing Date: 2004-07-20
Classification: G21K

Abstract:
A neutron compound refractive lens for neutrons, comprising:a plurality of individual unit Fresnel lenses comprising a total of N in number, said unit lenses hereinafter designated individually with numbers i=1 through N, said unit lenses substantially aligned along an axis, said i-th lens having a displacement ti orthogonal to said axis, with said axis located such that &Sum;i=1N&it;â€ƒ&it;ti=0,and;wherein each of said unit lenses comprises a lens material having a refractive index decrement &dgr;<1 at a wavelength &lgr;<200 Angstroms; and wherein said displacements ti are distributed such that there is a standard deviation &sgr;t of said displacements ti about said axis, and wherein each said unit lens has n zones, and wherein each said unit lens has a smallest Fresnel zone width of snâˆ’snâˆ’1, where sn and snâˆ’1 are the zone radii of the n and nâˆ’1 zones and the standard deviation is &sgr;t&lE;[snâˆ’snâˆ’1]/4.