NTOFF11 Experiment Beam Window Assessment Hg Jet Interaction with the 15 Tesla Field Hydrodynamic Analysis of Hg in Supply/Plenum/Jet Hg Jet Interaction.

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Presentation transcript:

nTOFF11 Experiment Beam Window Assessment Hg Jet Interaction with the 15 Tesla Field Hydrodynamic Analysis of Hg in Supply/Plenum/Jet Hg Jet Interaction with Proton Beam STATUS N. Simos Brookhaven National Laboratory

nTOF11 On-going Activities Beam Windows: –Conceptualization –Analysis –Interfacing/integration –Design and procurement Intense Simulations: Interaction of Hg Jet and Target Assembly with the 15 Tesla Field. Estimation of Magnetic Forces (ANSYS 3D Analysis) Hydrodynamic Simulation of Hg in Supply Line/plenum/Jet (LS- DYNA) Beam/Hg Interaction and Splashing within target cavity (LS-DYNA)

nTOF11 Beam Window Study Find best possible materials/design that can have the best performance as beam windows under nTOFF11 experiment conditions (28 TP/1mm RMS/50-100ns pulse) ENSURE that multiple defense layers are in place and that they have been studied thoroughly

Jet Deflector Hg Jet Z=0 Viewport Secondary Containment Anti-vibration Mechanism Primary Containment Proton Beam CONCEPTUAL DESIGN (fluid)

Why do we worry? Induced shock stress in a window structure by 16 TP intensity beam and a spot of 0.5mm RMS will likely fail most materials in a single short pulse ( ~ 2 ns) Figure depicts prediction of von Mises stress in a stainless steel window for the above conditions. Initial shock stress is ~ 3 x yield strength of material !!

What Did We Learn from Past Studies: Mechanism of induced shock stress in windows No matter how thin the window is, the reverberation of stress between surfaces is the key issue von Mises stress amplitude depends on the spot size (initial compressive load amplitude), thickness of window, speed of sound and pulse shape

REMEMBER: Beam does not hit where we like it. Things can amplify as we leave the symmetrical world!

DETAILED BEAM WINDOW ANALYSIS PHASE I: Windows in a Disk/Flange Arrangement Window Baseline Material: Ti_6Al_4V

DETAILED BEAM WINDOW ANALYSIS PHASE I: Windows in a Disk/Flange Arrangement STAINLESS STEEL WINDOW as good as dead

DETAILED BEAM WINDOW ANALYSIS PHASE I: Windows in a Disk/Flange Arrangement Scrutinized different window thicknesses/pulse structures

DETAILED BEAM WINDOW ANALYSIS PHASE I: Windows in a Disk/Flange Arrangement

DETAILED BEAM WINDOW ANALYSIS PHASE I: Windows in a Disk/Flange Arrangement

CONCEPTUAL DESIGN of PRIMARY CONTAINMENT/WINDOWS (as introduced at CERN Meeting)

CONCEPTUAL DESIGN of PRIMARY CONTAINMENT/WINDOWS 3-D Analysis with all components in place, including Hg

Primary Window DESIGN/ANALYSIS - Detailed Modeling

Primary Window Design/Analysis

CONCEPTUAL DESIGN Preliminary Results of Primary Window Stresses and Hg Pressures

SECONDARY WINDOWS Use Ti-6Al-4V material for upstream wall of secondary containment and use one window flange arrangement (see Fig. below). Minimize window infrastructure volume Create volume for monitoring (as required) Material chosen able to withstand shock (Ti-6Al-4V)

SUMMARY DOUBLE Window Integration both for primary and Secondary can work while minimizing infrastructure Material of choice (Ti6Al4V) shown by analysis to do the job even under worst case scenario conditions 1mm wall thickness throughout appears appropriate