This website is no longer maintained. Its content may be obsolete. Please visit http://home.cern/ for current CERN information.
Garfield Version 7.02
, GSI (Darmstadt, Germany)
Garfield version 7 comes with a new gas section based on an
interface with Magboltz 2
(see next article).
Maxwell generated field maps with rotational symmetry around an
axis, such as r-phi maps, can now be read.
The format of the
COMPONENTS statement has been
extended to allow for non-constant, parametrised or tabulated
FORCES command plots, on request, a diagram which
shows whether a wire is in stable or labile equilibrium.
CHANGE-VOLTAGES command now also works for
planes and for the tube.
Garfield version 7 by default obtains electron transport data from
Magboltz 2. An interface with the earlier version,
Magboltz 1, has been kept. These 2 programs solve the same
transport equations, but use different methods. Magboltz 2 is
more stable numerically, and is reported to reach much higher
accuracy especially for diffusion and deflection in a magnetic
Garfield tries to take maximum advantage of Magboltz 2 by
copying the full diffusion matrix, with correlation coefficients,
and in a magnetic field, all 3 components of the drift
As a consequence of the increased amount of gas data extracted
from Magboltz, compact format gas datasets generated with Garfield
version 6 can not be read with version 7.
In collaboration with Peter Cwetanski
and Ulrich Moosbrugger,
considerable progress has been made in the understanding of
avalanche statistics on small scales. This has on the one hand
resulted in the
PROJECTED-PATH integration parameter,
which to a large extent eliminates the dependence of the avalanche
size on the Monte Carlo step size. On the other hand, a new
RND_MULTIPLICATION has been written which
simulates the avalanche fluctuation over a fixed path, taking
attachment and multiplication into account.
Multiple weighting field maps computed by finite element programs
are now accepted. This should simplify the computation of response
functions of cathodes segmented in strips and pads.
A limited amount of user control of the layout of Cartesian plots
is provided through the
LAYOUT graphics command.
Environment variables are now expanded in metafile names.
Histograms, Matrices, Formulae and
As usual, many procedures have been added. Of particular importance
are a the
RND_MULTIPLICATION mentioned before, and
random number generators according to functions and histograms
function random number generator is based on the
FUNLUX routine from the CERN program library.
Garbage collect for matrix assignments in loops has been
Datasets and input / output:
Currently, the most accurate information can be found in the help pages
and the description of the
For matters related to this article please contact the author.
Vol. XXXIV, issue no 1
Last Updated on Fri Mar 17 21:33:28 GMT+04:30 2000.
Copyright © CERN 2000 -- European Laboratory for Particle Physics