1. NAME AND TITLE

MEDUSA-PIJ: One-Dimensional Laser Fusion Analyzer (Including Neutron Heating Effect) Collision Probability Method.

AUXILIARY ROUTINE

CALCOMP: Plotting package.

2. CONTRIBUTOR

Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; FACOM 230-75.

4. NATURE OF PROBLEM SOLVED

MEDUSA-PIJ calculates one-dimensional hydrodynamic and thermodynamic behavior such as the implosion and burning process of laser-driven plasma.

5. METHOD OF SOLUTION

The energy deposition due to the emitted neutrons is calculated by the collision probability method. The total energy deposition is considered in the energy balance equation of the system at each time step, and a hydrodynamic equation is solved with Lagrangian coordinates. Neutron spectra escaping from the fuel sphere are calculated by a neutron slowing-down equation derived under the two-collision model.

6. RESTRICTIONS OR LIMITATIONS

The maximum number of Lagrangian meshes is 150. The maximum number of regions used for collision probability calculation is 10.

7. TYPICAL RUNNING TIME

The running time is about 60 minutes for a case with 30 Lagrangian meshes and 10 regions for calculating collision probability.

8. COMPUTER HARDWARE REQUIREMENTS

The code was designed to operate on the FACOM-230/75 or CDC 6600 computers. The version offered by RSIC is operable on the FACOM-230/75.

188 K words of core storage are required.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

H. Takano and Y. Ishiguro, "MEDUSA-PIJ: A Code for One-Dimensional Laser Fusion Analysis Taking Account of Neutron Heating Effect," JAERI-M8186 (March 1979).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source codes and sample problem input and output.

12. DATE OF ABSTRACT

January 1982.