MOCADI

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Introduction

MOCADI is a Monte Carlo simulation program to calculate the transport of primary beams, projectile fragments, and fission fragments through ion optical systems described by third order transfer matrices and through layers of matter. The ion optical matrices can be calculated with the program GICOSY. Currently, input data describing the FRS with all branches, other fragment separators and storage rings are available for different ion optical settings. Atomic interactions [1] and nuclear interactions of relativistic heavy ions with matter are calculated according to [2]. Charge state distributions can be calculated with the help of special cross-section tables [3], otherwise they have to be be given explicitly as an input parameter. They can be obtained from the programs CHARGE or GLOBAL. In the case of projectile fragments the calculation of cross sections via the EPAX formula is included. ROOT trees, CERN-standard histograms (HBOOK) and list-mode output (Ntuple) for particle mass, charge, rigidity, energy, positions, angles, TOF, and more are available at any position along the optical system. They can conveniently be analyzed with PAW or ROOT.

How to use MOCADI at GSI

MOCADI at GSI is available on the Linux system . The input parameters for MOCADI like beam properties, magnet settings and the geometric information of the experimental setup (magnets, collimators, wedges etc.) are supplied by an ASCII input file. This input file also includes references to the data files containing the matrices for the particle transfer through the various magnets. To download an example input file or for information about the available ion optical settings go to the MOCADI download area. To run MOCADI first set the path names:

export MOCADI_DIR='/u/weick/mocadi/'
export MOCADI_DATA='/u/weick/mocadi/data'
export MOCADI_SPLINES_GZ='/u/weick/mocadi/splines_gz'

then call the program:

/u/weick/mocadi/exe/mocadi   < filename >    (full version but without Root tree output, linked static for 32 and 64bit)
/u/weick/mocadi/exe/mocadiR < filename >    (full version with Root tree output, linked dynamically)
/u/weick/mocadi/exe/gmocadi                         (GUI for mocadi)

where < filename > is the name of the MOCADI input file. The default extension of the input file is ".in" and can be omitted. For more details see the MOCADI manual.

Distribution policy and  copyright

H. Geissel holds the copyright for MOCADI, except for the subroutine for the calculation of the atomic interactions, which is copyrighted by C. Scheidenberger and P. Malzacher.
If you are interested to run MOCADI on LINUX in your institute you are welcome to contact H. Weick to obtain a copy of the executable. However, in order to prevent unauthorized modifications we decided not to distribute the source codes.

Contact

As of November 1999 Helmut Weick takes care of MOCADI at GSI. Please don't hesitate to send all comments, suggestions, or bug reports to him.

History and Acknowledgement

The program was developed in PL/I by T. Schwab, H. Geissel, and A. Magel at Giessen University in Germany. N. Iwasa translated MOCADI 1.34 into C on a DEC VMS operating system and developed it further.
N. Iwasa thanks K. Sümmerer and T. Baumann for their help on writing the MOCADI manual. N. Iwasa is grateful to M. Dahlinger for his help on programming (in particular, CERN-library and C-fortran). Many thanks are due to P. Malzacher and C. Scheidenberger for providing the splines calculated by ATIMA-1.2.

References

[1]  C. Scheidenberger et al., Phys. Rev. Lett. 73, 50 (1994); C.Scheidenberger et al., Phys. Rev. Lett. 77, 3987 (1996).
[2]  N. Iwasa et al., Nucl. Instr. Meth. B126 (1997) 284.
[3]  N. Iwasa, H. Weick, H. Geissel, Nucl. Instr. Meth. B269 (2011) 752.

 This page was written by Dr. Helmut Weick, 13th April 2012, contact h.weick(at)gsi.de,  Impressum