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Manuscript Title: Code OK1 - Simulation of multi-beam irradiation on a spherical target in heavy ion fusion.
Authors: A.I. Ogoyski, T. Someya, S. Kawata
Program title: OK1
Catalogue identifier: ADST_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 157(2004)160
Programming language: C ++.
Computer: PC Pentium 4 ~1GHz or more recommended.
Operating system: Windows, Unix.
RAM: 255M words
Word size: 32
Keywords: Heavy ion beam, Inertial confinement fusion, Energy deposition, Fuel pellet, Plasma physics, Inertial confinement.
PACS: 52.58Hm, 28.52Cx, 29.27Eg.
Classification: 19.7.

Nature of problem:
Nuclear fusion energy may have attractive features as one of our human energy resources. In this paper we focus on heavy ion inertial confinement fusion (HIF). Due to a favorable energy deposition behavior of heavy ions in matter it is expected that heavy ion beam (HIB) would be one of the energy driver candidates to operate a future inertial confinement fusion power plant. For a successful fuel ignition and fusion energy release, a stringent requirement is imposed on the HIB irradiation non-uniformity, which should be less than a few percent. In order to meet this requirement we need to evaluate the non-uniformity of a realistic HIB irradiation and energy deposition pattern. The HIB irradation and non-uniformity evaluations are sophisticated and difficult to calculate analytically. Based on our code one can numerically obtain a three-dimensional profile of energy deposition and evaluate the HIB irradation non-uniformity onto a spherical target for a specific HIB parameter value set in HIF.

Solution method:
OK1 code is based on the stopping power of ions in matter. The code simulates a multi-beam irradation, obtains the 3D energy deposition profile of the fuel pellet and evaluates the deposition non-uniformity.

Running time:
The execution time depends on the number of beams in the simulated irradiation and its charactistics (beam radius on the pellet surface, beam subdivision, projectile particle energy and so on). In almost all of the practical running tests performed, the typical running time for one beam deposition is less than 2 s on a PC with a CPU of Pentium 4, 2.2 GHz. (e.g. in Test 2 when the number of beams is 600, the running time is about 18 minutes).