Modifications and Extensions

Access to the latest update of SIMDET is obtainable via the dev branch on the Web page
"http://www-zeuthen.desy.de/linear_collider".

The code of the SIMDET development/extensions is provided as zipped tar file from a "cvs checkout Simdet". Links to these tar files can be found on
http://www-zeuthen.desy.de/lc_repository/detector_simulation/dev/SIMDET/readme.html .

Untaring the code creates a Simdet directory (and subdirectories). The Simdet subdirectory itself contains a configure script which generates the required Makefiles for the installation. The configure script accepts several options which can be visited by the invocation "configure -h" .

If an option is used by the data cards (e.g. zipped output of events) but not installed, Simdet will send a message to the standard output and exit. However, if Simdet is installed with gzio it is still possible to use the un-zipped output for events.

What is new since the release of SIMDET V4.01:

• The histogram storage is now initialized by HROPEN and closed by HROUT, HREND (Hbook package). This enables the user to book, fill, and write additional histos or ntuples in sr siuser
  (located in the ./Simdet/sianal/code_f subdirectory).

• The debug printing is reorganized: a new data card DEBUG is introduced with:
  DEBU n1 n2
  n1 - first event number for debugging
  n2 - last event number for debugging

• The "vecsub" package has been adapted to PYTHIA 6.1 and is added to the module Simdet (see the option "-with-vecs" in configure). The package provides many useful utility routines which may be called from siuser.

• Simdet accepts now generator input in StdHep format (eg. from the Whizard generator package). Any StdHep generator input file needs the extension ".stdhep" and the corresponding data cards should be:

  Key	Variable	Data type	Meaning
  PYTH	IFPYTH	INTEGER	0 = no PYTHIA event generation
  EVTI	IFEVTI	INTEGER	1 = event reading from an external file
  GENF	LUNGENF	TEXT	input file name with the extension .stdhep

• The Fortran interface to the zlib (zipped I/O) has been changed to use several streams for I/O based on logical unit numbers. This enables the user to write his own output to a user defined logical unit number (must be $>$ 12) as zipped file. How the interface can be used is described in the following section (as an example may serve the Fortran code in the subdirectory ./Simdet/sianal/code_f: sianal.F and anopen.F ).

• Simdet results can now be written also in a LCIO file.
  The filename is taken from the RECFILE data card and the extension "slcio" is added. The lcio output contains a run header and events with the collections for
  MCParticles, Tracks, Clusters and ReconstructedParticles.
  The content of those objects is deived from the standard event output structure using the records for Generated particle, Energy flow record 4, Energy flow record 5, and Energy flow record 2 resp. but not all class elements may be filled.
  
  LCIO output is steered by the data card:

  Key	Variable	Data type	Meaning
  LCIO	IFLCIO	INTEGER	1 = LCIO output is requested, 0 = no LCIO output (default)