1Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Neutrino Factory Cryostat 1 Concept V.B. Graves MERIT Videoconference Mar 11, 2009

2Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Study 2 Cryostat Schematic (Fig 3.4) Target containment extends to end of SC-5 – Be window also at this location Overflow drain at left end of pool determines pool depth Jet travels through a splash mitigator prior to entering pool Containment encompasses nozzle tip

3Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Iron Plug Proton Beam Nozzle Tube SC-1 SC-2 SC-3SC-4 SC-5 Window Mercury Drains Mercury Pool Water-cooled Tungsten Shield Mercury Jet Resistive Magnets Neutrino Factory Study 2 Target Concept ORNL/VG Mar2009 Splash Mitigator

4Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Cryostat 1 Upstream End

5Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Front View Includes slope for Hg drainage – Could potentially drain under resistive magnets Mechanical issues between nozzle and beam – Will be worse if Hg is double-contained Iron plug restraints will be an issue Splash mitigation scheme incorporated Relatively thin beam stop (Hg depth)

6Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Cryostat 1 Downstream End Window becomes a liquid barrier – Window actually on replaceable component Drainage piping relatively flat for some distance Mercury pool serves as additional SC shielding SC-5 Window Overflow Drain Valved Drain Tungsten Shielding

7Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 NF Cryostat 1 Dimensional Info Based on Study II Tables 3.13, 3.14 Dimensions in cm

8Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 NF Hg Jet Layout

9Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Study 2 Mercury Containment Vessel Alternate Another containment approach includes a shortened Hg container Drain lines exit cryostat between SC-3 and SC-4 This would trap container in the cryostat, preventing future replacement

10Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Containment Design Requirements Material compatible with high-field magnets – Must also withstand some number of full-power beam pulses with no Hg in vessel (accident scenario) Desire no replaceable components Provide support for Hg weight – ~220 liters, 3 metric tons Sloped (1°-2°) for gravity drain Overflow drain for 20m/s jet (1.6 liter/s) Vent for gas transfer

11Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Splash Mitigation Study 2 assumed a particle bed of tungsten balls to minimize effects of jet entering pool Many other feasible concepts to accomplish this function Simulation/analytical studies may be useful to limit options Pool circulation and drainage locations also need to be studied Prototypic testing needed for comparison & final determination

12Managed by UT-Battelle for the U.S. Department of Energy MERIT Videoconference 11 Mar 2009 Summary 3D conceptual model of a Neutrino Factory main cryostat is being refined Design and integration of this cryostat with a Hg containment vessel is very complicated – Mechanical issues may require physics compromises IDS is only funding avenue potentially available for serious design work