Argonne PowerPoint Presentation - Spallation Neutron Source

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Neutrons: Where do they come from? Measured Spallation Neutron Yield vs. Proton Energy for Various Targets, J. Frazer, et al. (1965) Absolute Global Neutron Yield Yield (neutrons/proton) = 0.1(E GeV - 0.12)(A+20), except fissionable materials; = 50.(E GeV - 0.12), 238 U. From Fraser et al., measurements at Brookhaven Cosmotron 2000-05264 uc/arb 8
Neutrons: Where do they come from? Low-energy (p,n) reactions, e.g. p + 9Be —> n + 2αλπηα + π ανδ > ν + 9Β (Most of the proton energy appears as heat.) 5-15 MeV ~ 1300 MeV/n @ Ep = 13 MeV (deposited in ~ 1.1 mm) 3.5x10-3 n/p Fluxes at moderator surface LENS @ 30 kW time average 4 X 10 11 n/cm 2 -sec @ 20Hz peak 1 X 10 14 n/cm 2 -sec Global neutron yield for Be (p,n) Y = 3.42x10 8 (E MeV - 1.87) 2.05 n/μιχροC 98-6240 uc/vlb 9
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: 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 and 18: How Do Moderators Work? Pulsed sour
Page 19 and 20: Spallation-Evaporation Production o
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

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