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Manuscript Title: Code OK2 - A simulation code of ion-beam illumination on an arbitrary shape and structure target.
Authors: A.I. Ogoyski, S. Kawata, T. Someya.
Program title: OK2
Catalogue identifier: ADST_v2_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 161(2004)143
Programming language: C ++.
Computer: PC (Pentium4, ~1GHz or more recommended).
Operating system: Windows or UNIX.
RAM: 2048 MBytes
Word size: 32
Keywords: Ion beam, Inertial confinement fusion, Energy deposition, Fuel pellet.
PACS: 52.58.Hm, 28.52.Cx, 29.27.Eg.
Classification: 19.7.

Nature of problem:
In research areas of HIF (Heavy Ion Beam Inertial Fusion) energy [1-4] and medical material sciences [5], ion energy deposition profiles should be evaluated and calculated precisely. Due to a favorable energy deposition behavior of ions in matter [1-4] it is expected that ion beams would be one of the preferable candidates in various fields including HIF and material processing. Especially in HIF for a successful fuel ignition and a sufficient fusion energy release, a stringent requirement is imposed on the HIB irradiation non-uniformity, which should be less than a few percent [4,6,7]. In order to meet this requirement we need to evaluate the uniformity of a realistic HIB irradation and energy deposition pattern. The HIB irradiation 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 onto an arbitrary shape and structure target.

Solution method:
OK2 code works on the base of OK1 [1-9]. The code simulates a multi-beam illumination on a target with arbitrary shape and structure, and obtains the 3D energy deposition profile .

Running time:
The execution time depends on the pellet mesh number and the number of beams in the simulated illumination as well as on the beam characteristics (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 about 40 s on a PC with a CPU of Pentium 4, 2.4 GHz.

[1] A. I. Ogoyski, et al., Code OK1 - Simulation of multi-beam irradiation on a spherical target in heavy ion fusion, Computer Physics Communications 157, 160-172 (2004).
[2] J.J. Barnard, et al., Lawrence Livermore National Laboratory Research Report, UCRL-LR-108095 (1991).
[3] C. Deutsch, et al., J. Plasma and Fusion Res. 77, 33 (2001).
[4] T. Someya et al., Fusion Science and Tech., Vol. 43, 282-289 (2003).
[5] S V. Bulanov, et al., Phys. Lett. A 299, 240-247 (2002).
[6] M.H. Emery, et al., Phys. Rev. Lett. 48, 253 (1982).
[7] S. Kawata, et al., J. Phys. Soc. Jpn. 53 (1984) 3416.
[8] T. Mehlhorn, Sandia Report, SAND80-0038, (1980).
[9] H.H. Andersen and J.F. Ziegler, 3 (Pergamon Press, 1977).