Rob Veenhof, NIKHEF (Amsterdam, the Netherlands)
Garfield is a computer program originally written for the detailed simulation of two-dimensional drift chambers. The PaRC service has taken over the production of executables at CERN. The following article describes the list of modifications since the latest official release (previous releases have been described in past CNL articles).
SOLIDS, has been added which can be used to define the 3-dimensional objects present in the chamber in case the field is derived from a field map. Entering these objects is not mandatory, but is helpful when studying collection efficiencies, computing calibration curves and signals. Some commands like
RESEThave been modified in line with the addition of the
SOLIDScommand. It is hoped that this information can in the future be derived from files produced by the finite element programs.
AREAwhich now accepts a considerably extended argument list.
PARAMETERSstatement and are taken into account when performing Monte Carlo drift line integration for ions. The diffusion coefficients are for the time being assumed not to depend on the field, but this limitation can be lifted if needed.
now accept a unit following the temperature and pressure.
The latter, for instance, can therefore be entered in more common
units like the
atm or the
Steve Biagi has released a Monte Carlo version of Magboltz which
should have a substantially higher accuracy.
An interface with this program is being written - meanwhile,
interested users should contact
Steve Biagi/University of
AREAcommand as in the field section has been introduced here.
PLOT_DRIFT_LINEhas been modified to match the new projection scheme.
Procedures for drifting negatively charged ions have been added.
A procedure that integrates the charge contained in a cylindrical or spherical area has been added. There is now also a procedure that computes the flux of the electric field through a parallelogram.
Intrinsic functions called
have been added.
They operate on histograms and matrices and return the minimum and the
maximum number of entries or value of the argument histogram or matrix.
/afs/cern.ch/project/parc/bin/garfield. For further information, please contact Parc.Support@cern.ch or Juan Manuel Guijarro (