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A Brief Overview    
The PCGrate®-S(X) v.6.5-6.6 32/64-bit series toolkit, which is designed for exact efficiency modeling of relief & phase diffraction gratings and rough mirrors, combines the brilliant performance of the earlier implementations of PCGrates with the modern Graphical User Interface with 3-D & 2-D Open GL plots and expands noticeably the set of supported features including two different solvers, paralleling, and the capability to calculate data from the command line using XML-format input/output files. With PCGrate-S(X) v.6.5-6.6 32/64-bit series software one can simulate rigorously effects of scattering in periodical and non-periodical structures having multilayer micro/nano-roughnesses of various nature, design variable-groove-depth (VGD) & variable-line-spaced (VLS) multi-section gratings, model gratings covered with very thin or/and thick layers having arbitrary profiled borders including real & non-function ones, calculate photonic crystals & aspherical gratings, and work with conical mountings & non-planar incident waves including Gaussian ones as well as with a general polarization state.

PCGrate®-S(X) v. 6.6 32/64-bit software has many adds and improvements in comparison with v. 6.5. The new optical mounting (“Fix Focus”) and relevant photon energy unit (“eV”) were added to this version. Fix Focus is an optical mount configuration for a reflected order where the reflected order is observed at a fixed ratio c of polar diffraction and incidence angle cosines that is used at x-ray–EUV synchrotron radiation sources in plane grating focusing monochromators. In version 6.6, the “E(-1) refl” and the “E(-1) trans” buttons were added to quickly plot efficiency of reflected/transmitted order #-1 graphs. If there are multiple suitable scanning parameters, then an additional dialog appears and you have to choose one. Conical diffraction algorithms to predict reflection grating efficiencies in short waves were substantially improved. A lot of minor changes were implemented both in the v. 6.6 code and the documentation.
The PCGrate®-S(X) v.6.1 32-bit Series toolkit combines the superb performance of earlier implementations of the PCGrates with a modern GUI that has 3-D&2-D OpenGL plots and extends appreciably the set of supported features such as paralleling and the calculation of grating efficiency from the command line using XML-format input/output files. The PCGrate-S(X) v.6.1 Series software makes it possible to simulate the effect of micro-roughness and inter-diffusion (i.e. random scattering in the multilayers), to model gratings covered with thin or/and very thick layers of arbitrary shape, to calculate aspherical gratings, and to work with conical mountings and non-planar incident waves as well as with a general polarization state.  
The Limits and Constraints of DEMOs of the PCGrate®-S(X)™ Software    
The Demo versions of PCGrate-S(X) v.6.1 32-bit Complete and PCGrate-S(X) v.6.5-6.6 32/64-bit Complete have several restrictions.    
Table. Key parameter possible values for Demos    
Maximal number of layers  
Maximal number of points per boundary  
Diffraction orders range  
Number of plane waves & plane sections  
Maximal thickness-to-period ratio  
GUI & XML output formats  
Near-zone field output  
From x-rays to meters  
3 × 3  
Hardware Requirements of the PCGrate Demos  Complete  
The PCGrate Demo v.6.1 32-bit and v.6.5-6.6 32/64-bit for Microsoft® Windows® 32/64-bit requires:    
  • Microsoft® Windows® 2K/XP/Server 2003/Vista/Server 2008/7 or higher installed.  
  • PC-compatible single- or multi-core/processor computer.    
  • At least 64 MB of free RAM.    
  • Minimum 50 MB of free hard disk space.    
  • Web and e-mail access for technical support and program updates.    
A Brief Overview    
The optimization algorithm "HCP Solver" is an approximate polynomial algorithm with O(1.5N3). It is based on the concept of successive iterative decreases in cycle length, in which the iterative procedure begins with a randomly chosen cycle. As different edges of the graph are assigned the weights 0 and 1, the cycle length is determined in view of the edges with the unit weight. Each iteration is completed by replacement of several edges in the cycle. In this case the cycle length either decreases or remains unchanged. A Hamiltonian cycle in the graph exists if its length is equal to zero (H = 0). The graphical viewer for graphs and the generator of leaper graphs stored in TSPLIB-format (*.hcp) are included in the package.    
A Brief Overview    
The TSMP-1 (Traveling SalesMan Problem) code is intended for solving the problem of the precise determination of the length and path of a minimal Hamiltonian cycle (cycles) of a weighed network (the Traveling Salesman Problem, the TSP) in a time that polynomially depends on the network's dimension (the number of its nodes); and it also relates to the construction (on this basis) of algorithms of polynomial complexity to solve so-called NP-complete problems of discrete mathematics. The essence of this problem is as follows: to find in a network given a cycle sequence of passing the edges in such a way that it includes all the nodes of the network one and only one time (i.e. the passage of the edges is a Hamiltonian cycle), and the sum of the edge weights of the cycle under consideration (the length of the cycle) is minimal among all possible cycles of the network (at least not greater than the length of any other cycles having similar properties). The research program including the source code and documentation can be obtained from this page ( file). Input and output files from TSPLIB – Gerd Reinelt's library of TSP instances – are included in the package.  

Hardware Requirements of the HCP and TSMP Solvers    
The HCP v. 1.0 and TSMP-1 v. 1.0 software for Microsoft® Windows® 32/64-bit require:    
  • Microsoft® Windows® 95-Server 2008 or higher installed.    
  • PC-compatible (Pentium® or higher for better performance) single-processor computer.    
  • At least 64 MB of free RAM.    
  • Minimum 10 MB of free hard disk space.    
  • Web and e-mail access for technical support and program updates.    
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