PDP discharge is a non-stationary, highly nonlinear barrier
discharge, in which densities of charged particles change from almost
negligible to a very large (*n*_{e,i }~ *10*^{15}cm^{-3}),
completely screening the applied electric field in about 100ns. The time
scales of simultaneously occurring processes may differ by 5-7
orders of magnitude. The spatial scales in different areas of
the discharge differ by at least an order of magnitude.
Electron m.f.p. in the cathode fall area is less than an order
of magnitude smaller than the cathode fall size. All these
factors put serious restrictions on the codes. Statistical,
multi-dimensional
effects, numerical diffusion in the cathode area, accuracy and
speed limit the applicability of fluid-like codes (including
the Boltzmann kinetic code), that is why we choose the PIC/Monte-Carlo
approach.

On the other hand, when one is interested in more general
characteristics of the discharge, or in **collective effects
**caused by the interaction between cells through wires,
electric and magnetic fields they radiate in the panel, and
how their interaction affects the operation of a particular
cell, then one can use a fluid approach, which is fast enough
to handle many cells - we have simulated 100 macro-cells on a
single processor laptop, and a multiprocessor computer can
easily handle thousands of cells.

**3D PIC/Monte-Carlo code** for simulation of any
kind of discharge in a coplanar PDP, and versions of the code
optimized for the ramp discharge, and investigation of the
jitter. Demo version of the ramp - optimized code can be
downloaded **
here**.
All codes can be customized, and can run on a single or
multi-processors computers.

**2D PIC/Monte-Carlo
code**** (fully conservative)** for simulation of any kind
of discharge in a coplanar PDP. 2D code is significantly
faster, and more accurate than 3D code. Of course, it
can't be used for 3D effects investigations. **Fully
conservative** means that it does **not** have **any**
artificial heating of electrons, which may be responsible for
more excitations in the afterglow, more electron losses to the
walls and thus effects efficiency of the sustain discharge.

**2D-Multicell fluid code** for the simulations of the whole
PDP line, including thousands of cells, distributed and
discrete elements (R, L, C). This is the only code that can
evaluate loading effects, caused by the interaction between
cells when many of them are turned ON, and the voltage across
wires is not negligible. It shows distribution of voltage,
current across every cell, as a function of time.