G. Davidenko(3), M. A. Funk(4), V. Kim(2), N. Kuropatkin(2;7),
V. Kurshetsov(5), V. Molchanov(5), S. Rud(6), L. Stutte(1),
V. Verebryusov(3), R. Zukanovich Funchal(7)
(E781 Collaboration)
(1)Fermi National Accelerator Laboratory, Batavia, IL 60510
(2)Petersburg Nuclear Physics Institute, Gatchina, Russia
(3)Institute of Theoretical and Experimental Physics, Moscow, Russia
(4)Max-Planck-Institut f"ur Kernphysik, Heidelberg, Germany
(5)Institute of High Energy Physics, Protvino, Russia
(6)Moscow State University, Moscow, Russia
(7)Universidade de S"ao Paulo, S"ao Paulo, Brazil
AbstractThe Monte Carlo package for the fixed target experiment E781 at Fermilab is described. This is a third generation charmed baryon experiment, which is quite complex. The apparatus contains more than 200 thousand read-out channels and includes many Si-Strip detectors, PWCs, drift chambers, photon calorimeters and also such complicated devices like RICH and TRD detectors.
The simulation package is based on GEANT 3.21, ADAMO database and DAFT (Data From Tape) input/output routines. The program was conceived in a structural form using PATCHY/CMZ so as to be possible to develop detector dependent blocks of it in different parts of the world. This block structure and the ADAMO database gives us the possibility to simulate virtually any fixed target experiment. Event generation includes the simulation of E781 hyperon beam, its inter- action in the charm production targets according to different LUND generators.
An entity relationship structure (Monte Carlo block) for hits and tracks is constructed to save the event information. The digitization of each detector set is packed in the form of the raw data blocks. The output of the program is made according to the data acquisition format, using DAFT, and contains raw data and Monte Carlo blocks. This package has been tested on different Unix platforms.