Garfield Version 7.02
The main feature of Garfield version 7.02 is that it has an interface with the Magboltz 2 program. This should greatly improve the accuracy of calculations in which a magnetic field and diffusion are key factors.
Garfield version 7 comes with a new gas section based on an interface with Magboltz 2 (see next article).
CELL section:Maxwell generated field maps with rotational symmetry around an axis, such as r-phi maps, can now be read.
MAGNETIC-FIELD section:The format of the
FIELD section:No changes.
GAS section: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 field.
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 velocity.
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.
DRIFT section: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
SIGNAL section: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.
Graphics:A limited amount of user control of the layout of Cartesian plots is provided through the
Environment variables are now expanded in metafile names.
Histograms, Matrices, Formulae and Calls:As usual, many procedures have been added. Of particular importance are a the
Garbage collect for matrix assignments in loops has been improved.
Datasets and input / output:No changes.
Compilation, batch:No changes.
Documentation:Currently, the most accurate information can be found in the help pages and the description of the command line.
About the author(s): Rob Veenhof is a physicist currently working on the design of the read-out chambers of the Alice and Harp TPCs.