Argonne PowerPoint Presentation - Spallation Neutron Source

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Types of Neutron Sources-cont’d Pulsed spallation sources e.g., IPNS, ISIS, LANSCE, SNS. 200 µA, 0.8 GeV, 160 kW 1.4 mA, 1.0 GeV, 1.4 MW ISIS 2x10 13 n/cm 2 /s average flux SNS 8x10 15 n/cm 2 /s peak flux Advantages – High peak flux. – Advantageous time structure for many applications. – Accelerator based – politics simpler than reactors. – Technology rapidly evolving. Disadvantages – Low time averaged flux. – Not all applications exploit time structure. – Rapidly evolving technology. 98-6235 uc/rra 18
Spallation-Evaporation Production of Neutrons Original Nucleus Excited Nucleus Residual Radioactive Nucleus Ep Proton ~10 –20 sec > 1 sec ~ ‘ ‘ ‘ e γ ‘ ‘ ‘ ‘ ‘ γ Recoiling particles remaining in nucleus ‘ ‘ e ‘ γ Emerging “Cascade” Particles (high energy, ~ E < Ep) (n, p. π, …) (These may collide with other nuclei with effects similar to that of the original proton collision.) Evaporating Particles (Low energy, E ~ 1–10 MeV); (n, p, d, t, … (mostly n) and γ rays and electrons.) Electrons (usually e + ) and gamma rays due to radioactive decay. 19
Page 1 and 2: Neutron Sources for Materials Resea
Page 3 and 4: Neutrons and Neutron Sources-cont
Page 5 and 6: How do we produce neutrons? Fission
Page 7 and 8: Neutrons: Where do they come from?
Page 9 and 10: Neutrons: Where do they come from?
Page 11 and 12: Types of Neutron Sources The Instit
Page 13 and 14: Types of Neutron Sources-cont’d L
Page 15 and 16: How Do Moderators Work? Steady sour
Page 17: How Do Moderators Work? Pulsed sour
Page 21 and 22: Types of Neutron Sources-cont’d P
Page 23 and 24: History The Materials Testing Accel
Page 25 and 26: MTA-cont’d Cutaway View of Linear
Page 27 and 28: Pulsed Spallation Neutron Source Co
Page 29 and 30: The Spallation Neutron Source The
Page 31 and 32: SNS Moderator Intensities and Pulse
Page 33: End of Presentation Thank you! 33

Argonne PowerPoint Presentation - Spallation Neutron Source

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