876	        // ****************************** cvd cooling support discs ************************
877	        // the cvd disc shape
878	        TGeoTube* shape_cvd_disc = new TGeoTube("shape_cvd_disc", 0.,
879	                        cvd_disc_rad, cvd_disc_thick_half);
880	        // The inner beam pipe defines the inner acceptance region for the cvd cut_out
881	        TGeoTube* shape_cvd_cutout_inner = new TGeoTube("shape_cvd_cutout_inner",
882	                        0., inner_rad, 1.);
883	        // finally cvd discs will be cut at the left and right down to 36 degree in phi
884	        // for that we subtract tube segments
885	        TGeoTubeSeg* shape_cvd_disc_cut_side = new TGeoTubeSeg(
886	                        "shape_cvd_disc_cut_side", 0., outer_rad, 1.,
887	                        +delta_phi / 2. / pi * 180.,
888	                        -delta_phi / 2. / pi * 180.);
889	        // before: cvd disc was moved to the displaced position around the z axis
890	        // now: segments for the cut are moved off centered and cvd disc remains in the center
891	        TGeoRotation* cvd_rotation = new TGeoRotation("cvd_rotation", 0, 0, 0);
892	        TGeoTranslation* cvd_translation = new TGeoTranslation("cvd_translation",
893	                        -cvd_disc_dist, 0, 0);
894	        TGeoCombiTrans* cvd_combtrans = new TGeoCombiTrans(*cvd_translation,
895	                        *cvd_rotation);
896	        cvd_combtrans->SetName("cvd_combtrans");
897	        cvd_combtrans->RegisterYourself();
898	        TGeoCompositeShape
899	        *shape_cvd_support =
900	                        new TGeoCompositeShape(
901	                                        "shape_cvd_support",
902	                                        "(shape_cvd_disc-shape_cvd_cutout_inner:cvd_combtrans-shape_cvd_disc_cut_side:cvd_combtrans)");
903	
904	        TGeoVolume* lmd_vol_cvd_disc = new TGeoVolume("lmd_vol_cvd_disc",
905	                        shape_cvd_support, fgGeoMan->GetMedium("HYPdiamond"));
906	        lmd_vol_cvd_disc->SetLineColor(9);

// the cvd disc shape
886	        double gap_between_disc_and_support_structure(0.025); // 250 mu gap
887	        TGeoTubeSeg* shape_cvd_disc = new TGeoTubeSeg("shape_cvd_disc", inner_rad,
888	                        lmd_cool_sup_inner_rad - gap_between_disc_and_support_structure,
889	                        cvd_disc_thick_half, -delta_phi / 2. / pi * 180.,
890	                        +delta_phi / 2. / pi * 180.);
891	
892	        TGeoRotation* cvd_rotation = new TGeoRotation("cvd_rotation", 0, 0, 0);
893	        TGeoTranslation* cvd_translation = new TGeoTranslation("cvd_translation",
894	                        -cvd_disc_dist, 0, 0);
895	        TGeoCombiTrans* cvd_combtrans = new TGeoCombiTrans(*cvd_translation,
896	                        *cvd_rotation);
897	        cvd_combtrans->SetName("cvd_combtrans");
898	        cvd_combtrans->RegisterYourself();
899	
900	        //this next line is pretty stupid but it made the work for the better geometry minimal
901	        //otherwise I would have to do some deeper digging and reworking...
902	        TGeoCompositeShape *shape_cvd_support = new TGeoCompositeShape(
903	                        "shape_cvd_support",
904	                        "(shape_cvd_disc:cvd_combtrans+shape_cvd_disc:cvd_combtrans)");
905	
906	        TGeoVolume* lmd_vol_cvd_disc = new TGeoVolume("lmd_vol_cvd_disc",
907	                        shape_cvd_support, fgGeoMan->GetMedium("HYPdiamond"));
908	        lmd_vol_cvd_disc->SetLineColor(9);