{
  TGeoVolume *beam = gGeoManager->MakeBox("Beam",medium[18], 500., 500., 500.);


  int pipe_medium = 17;
  float pip_flansch_length = 3. ;
  float pip_distance_silvio = 0.2 ; 
  float pip_dim[9] = { 0. , 360. , 2. ,0. , 10. , 11. , -1. , 10. , 11. };

  TGeoPcon *pconpipe = new TGeoPcon(pip_dim[0] , pip_dim[1] , int(pip_dim[2]));
  for(int i=0;i<int(pip_dim[2]);i++)
    {
      float z  = pip_dim[2+i*3+1];
      float ri = pip_dim[2+i*3+2];
      float ra = pip_dim[2+i*3+3];
      pconpipe->DefineSection( i , z , ri , ra );
    }
  

  TGeoVolume *pipe = new TGeoVolume("Pipe", pconpipe, medium[pipe_medium-1]);
  pipe->SetLineColor(17);
  beam->AddNode(pipe, 1. , new TGeoTranslation( 0. , 0. , 0. ));
  


}