Energy Deposition in the NuMI Neutrino Beam-Line.pdf

NuMi{B{709December 20, 2000Energy Deposition in the NuMI Neutrino Beam-LineF.NovoskoltsevInstitute for High Energy Physics, Protvino, Russia1 IntroductionThis Report gives results of energy deposition calculations for LE and MEcongurations of the PH2 focusing system in dierent parts of the beam-line including the beam plug and hadronic hose. The presented informationincludes also results of calculations of energy distributions in front of thebeam absorber.All results were obtained using the MARS14 computer code for the120 GeV resonant extracted primary beam with 41013 protons per spill.The total energy of a primary beam is equal to 768 kJ or 404 kW in termsof an average power taking into account the 1.9 s repetition period.2 Description of the Beam-LineThe MARS model of the beam-line includes the focusing system locatedinside the target pile, the decay region and the beam absorber.The focusing system includes the target, magnetic horns and the beamplug. The target is dened as a graphite plate with the rectangular crosssection. Target lengths and average densities are equal to 0.94 m, 1.20 mand 1.66 g/cm3, 1.41 g/cm3 for LE and ME beams respectively. The shapesof inner conductor of horns are described in report [1], the thicknesses ofouter conductors are equal to 100 and (1/2)00 for the rst and second hornrespectively. The graphite beam plug [2] has the length of 1.5 m and thediameter of 31.7 mm and is located 1 m downstream the horn1.The target pile consists of steel and concrete shieldings surrounding thebeam-line. The cross section of the target pile, which is shown in Figure 1corresponds to the cross section from Figure 3-2-17 [3]. The point withcoordinates of (X,Y)=(0,0) corresponds to the beam-line axis.1 Figure 1: A cross section of the target pile.The decay region consists of the steel pipe with the inner radius of 1 mand the thickness of (1/2)00, concrete shielding surrounding the steel pipewith the outer radius of 4.5 m and the hadronic hose [4] (the 1