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Manuscript Title: ALCBEAM - neutral beam formation and propagation code for beam based plasma diagnostics.
Authors: I.O. Bespamyatnov, W. L. Rowan, K.T. Liao
Program title: ALCBEAM
Catalogue identifier: AEKU_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)669
Programming language: IDL.
Computer: Workstation, PC.
Operating system: Linux.
Keywords: Neutral beam, NBI, DNB, Injection, Simulation, Beam-gas attenuation, Beam-plasma attenuation, Alcator C-Mod tokamak.
PACS: 52.40Mj.
Classification: 19.2.

Nature of problem:
Neutral beams are commonly used to heat and/or diagnose high-temperature magnetically-confined laboratory plasmas. An accurate neutral beam characterization is required for beam-based measurements of plasma properties. Beam parameters such as density distribution, energy composition, and atomic excited populations of the beam atoms need to be known.

Solution method:
A neutral beam is initially formed as an ion beam which is extracted from the ion source by high voltage applied to the extraction and accelerating grids. The current distribution of a single beamlet emitted from a single pore of IOS depends on the shape of the plasma boundary in the emission region. Total beam extracted by IOS is calculated at every point of 3D mesh as sum of all contributions from each grid pore. The code effectively unifies the ion beam formation, extraction and neutralization processes with neutral beam attenuation and excitation in plasma and neutral gas and beam stopping by the beam apertures.

Running time:
10 mins for a standard run.