| 日時: |
2004-12-21 16:00 - 17:00 |
| 場所: |
１号館談話室 |
| 会議名: |
Heavy Ion Inertial Fusion Program in US and |
| 連絡先: |
高山 健 takayama post.kek.jp |
| 講演者: |
S.M.Lund (LBNL/LLNL) |
| 講演言語: |
英語 |
| アブストラクト: |
The WARP code is an extensive self-consistent electrostatic
PIC Code developed to simulate ion beams with high space-charge
intensity for Heavy Ion Fusion and other applications. WARP Consists
of a family of self-consistent moment, 2D(r-z axisymmetric and x-y
transverse slice), and 3D models with an extensive hierarchy of field-solvers and particle movers that work with bent or "warped"
lattices and common diagnostics. Numerically intensive routines in
fortran are linked to the Python interpreter. Many diagnostic and
code control structures are coded in Python to allow flexible
operation and code steering.
This structure allows models and numerical methods to be utilized
under a common framework, thereby facilitating checks of
idealizations and numerical methods. Here we highlight recent
advances in WARP modeling capabilities and overview a particular
advance in the understanding of intense beam properties learned from
WARP. Modeling advances include:adaptive mesh refinement enabling
high resolution simulations that are being applied to injectors;
complex geometry field solver with multiple emitting structures,
apertures, beams, and self-consistent particle scraping to enable
simulation of multi-beam injectors with merging; generalized
particle loading to construct initial distributions consistent with
limited experimentally measured distribution projections; and a
hybrid mover for electrons and ions that interpolates between a
usual Boris advance and a drift kinetic model to enable more
efficient e cloud simulations. To highlight physics insights
provided by the code, we highlight WARP modeling of the High
Current Transport Experiment(HCX) at LBNL that illustrate problems
associated with lattice transitions and aperturing (scraping) of
intense beams. |
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