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Accident scenarios on a quad in MTA beam line

Accident scenarios on a quad in MTA beam line. Igor Rakhno April 20, 2007. The scenarios. Beam hits the beam pipe center inside the quad – model 1 Beam hits the quad pole – model 2 The quad is ~ 17 m upstream of the concrete shield block Vertical angle = 50 mrad 400 MeV protons

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Accident scenarios on a quad in MTA beam line

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  1. Accident scenarios on a quadin MTA beam line Igor Rakhno April 20, 2007

  2. The scenarios • Beam hits the beam pipe center inside the quad – model 1 • Beam hits the quad pole – model 2 • The quad is ~ 17 m upstream of the concrete shield block • Vertical angle = 50 mrad • 400 MeV protons • Normalization does not matter because we are looking for a relative behavior. Here it is 2×1014 p/s.

  3. Calculated distributions atop the berm are poor. • More or less reliable data were obtained for a 1-ft layer inside the berm, 5.3 ft above the concrete ceiling. In other words, vertical distance between the layer and the beamline is 405 cm. • Atop the berm mostly low-energy neutrons and gammas exist, almost no stars.

  4. Plan view of the Linac – MTA area

  5. Linac – MTA area: fragment with a quad

  6. Quad cross section

  7. Star density inside soil, 5.3 ft above the concrete ceilingModel 1Model 2

  8. Neutron flux inside soil, 5.3 ft above the concrete ceilingModel 1Model 2

  9. Star density and neutron fluxvs distance from the quad

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