HALO [1] is a Monte Carlo computer program which permits the calculation of the halo in muon beams. It may also be used to find the muon background in other charged particle beams.

[1] Ch.Iselin, HALO, A COMPUTER PROGRAM TO CALCULATE MUON HALO, CERN 74-17, Geneva, 1974

Using HALO the muon background is simulated for the experimental areas of H8 beam line. As H2 beam line is very similar, the results are as well valid there.

Bildchen fehlen.

Appendix: A small routine has been written, which creates automatically a HALO input file for a variable momentum from a H8 layout file. The perl routine is called by typing "perl createh8muon.pl". The input of the layout is h8fm03template, which should not be modified except for adding histograms. The file createh8muon.pl contains the magnet settings at the original momentum $pmom=300 and the information of the desired momentum $pout. The file created is called "h8halo03_%1", where %1 is the nominal momentum of the beam line.

The ASCII output is converted to PAW histograms by a routine called ~afabich/private/haloplots/halotohbook.f, where the command line argument is the halo output file to be found in private/haloout. Not implemented in this routine is the conversion of flagged 2-dim histograms. All other types as 1-dim histos (un-/flagged) and unflagged 2-dim histos are running.