1managed by ut-battelle for the u.s. department of energy merit videoconference 11 mar 2009 neutrino...
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1 Managed by UT-Battellefor the U.S. Department of Energy MERIT Videoconference 11 Mar 2009
Neutrino Factory Cryostat 1 Concept
V.B. Graves
MERIT VideoconferenceMar 11, 2009
2 Managed by UT-Battellefor 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
3 Managed by UT-Battellefor the U.S. Department of Energy MERIT Videoconference 11 Mar 2009
IronPlug
ProtonBeam
NozzleTube
SC-1
SC-2 SC-3 SC-4SC-5
Window
MercuryDrains
MercuryPool
Water-cooledTungsten ShieldMercury
Jet
ResistiveMagnets
Neutrino Factory Study 2 Target Concept
ORNL/VGMar2009
SplashMitigator
4 Managed by UT-Battellefor the U.S. Department of Energy MERIT Videoconference 11 Mar 2009
Cryostat 1 Upstream End
5 Managed by UT-Battellefor 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)
6 Managed by UT-Battellefor 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
OverflowDrain
ValvedDrain
TungstenShielding
7 Managed by UT-Battellefor the U.S. Department of Energy MERIT Videoconference 11 Mar 2009
NF Cryostat 1 Dimensional Info
Based on Study II Tables 3.13, 3.14Dimensions in cm
8 Managed by UT-Battellefor the U.S. Department of Energy MERIT Videoconference 11 Mar 2009
NF Hg Jet Layout
9 Managed by UT-Battellefor 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
10 Managed by UT-Battellefor 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
11 Managed by UT-Battellefor 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
12 Managed by UT-Battellefor 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