Slide 1

The LENS Facility at IUCF David V. Baxter Indiana University A. Bogdanov, J. M. Cameron, P. Chen (UIUC), V. P. Derenchuk, B. Jones (UIUC), H. Kaiser, C. M. Lavelle, M. A. Lone, M. B. Leuschner, H. O. Meyer, H. Nann, R. Pynn, N. Remmes, T. Rinckel, W. M. Snow, P. Sokol Slide 2 OUTLINE What is LENS, how dose it work? What is LENS, how dose it work? Neutronic details of the design Neutronic details of the design Performance of the source Performance of the source Conclusions Conclusions Slide 3 Neutron Sources From :G. Bauer LENS Slide 4 From R. Pynn, UCSB Slide 5 ISIS ILL Slide 6 Neutron Powder Diffraction J. D. Jorgensen et al. PRB 36 3608 (1987) YBCO lines CuO impurity lines YBCO lines CuO impurity lines Phase Transition and O ordering in YBCO Residuals Slide 7 Protein Interactions (in solution!) JK Krueger et al. Biochem. 37, 13997 (1998) Calmodulin and myosin L C Kinase IKIK I CK ICIC Slide 8 n Source Reactions Slide 9 p + Be Reaction p + Be Reaction 13 MeV 2006 Yield ~ 0.007 n/p@13 MeV ~.0015 n/p @ 7MeV 7 MeV Slide 10 Primary Source characteristics Slide 11 Neutron/Gamma Yields 13 MeV, 30 kW 9 Be+p ( )+ xn Y n = 1 x10 14 /s ; = 2.3 MeV 9 Be+p ( )+ xn Y n = 1 x10 14 /s ; = 2.3 MeV 9 Be+p Li+ + Y = 7 x10 12 /s ; E = 3.5 MeV 9 Be+p Li+ + Y = 7 x10 12 /s ; E = 3.5 MeV 9 Be+ Y = < 10 11 /s ; E = < 15 MeV 9 Be+ Y = < 10 11 /s ; E = < 15 MeV Other Gammas: Hydrogen: 8x10 13 /s Other Gammas: Hydrogen: 8x10 13 /s Boron: 3x10 13 /s Boron: 3x10 13 /s Al ( ): 4x10 12 /s Al ( ): 4x10 12 /s Slide 12 p + Be Reaction p + Be Reaction 13 MeV 2006 Yield ~ 0.007 n/p@13 MeV ~.0015 n/p @ 7MeV 7 MeV Slide 13 How could LENS work? Feature LENS/SPSS (low power) Feature LENS/SPSS (low power) Nuclear efficiency 1/2500 Nuclear efficiency 1/2500 Larger average current 200 Larger average current 200 No decouplers/poisons 6 No decouplers/poisons 6 Geometric Coupling 2 Geometric Coupling 2 Colder Spectrum 1.2-10 (???) Colder Spectrum 1.2-10 (???) Slide 14 IUCF Slide 15 IUCF Slide 16 LENS at IUCF Slide 17 Facility Layout: Fall 2005 Slide 18 Slide 19 Slide 20 Missions Slide 21 SANS SESAME aCORN NREP LENS Floor Plan-2007 Accelerator TMR future Slide 22 MCNP model geometry Slide 23 Slide 24 Neutronic basics Time scales decoupler Slide 25 Target Moderator Reflector (TMR) Slide 26 (TMR) Slide 27 Slide 28 Slide 29 Moderator Thickness Study Cryogenics Cavity 1.0 Cm Thick (present configuration) 2.0 cm Thick (proposed change included in study) Slide 30 Moderator Thickness Slide 31 Methane Thickness (MCNP) Slide 32 Effect of Geometry details Slide 33 Slide 34 Protons in linac: 15 Dec. 2004 Proton Current RFQ power DTL Power Slide 35 Neutrons in 2-D Detector: 15 Dec. 2004 Slide 36 First Neutron Spectra Activation Foil here 3 He detector here Slide 37 Empty moderator spectrum Slide 38 Emission time predictions Slide 39 Emission time measurements Slide 40 LENS is a novel facility for producing and using neutrons on a human scale. IAEA LENS is a novel facility for producing and using neutrons on a human scale. IAEA It offers unique opportunities in neutronic and instrumentation development as well as for materials research It offers unique opportunities in neutronic and instrumentation development as well as for materials research Neutronic performance is within 10% of predictions at low E (thermal), but discrepancy is greater (~80%) at high E (MeV) and cold energie (30%). Neutronic performance is within 10% of predictions at low E (thermal), but discrepancy is greater (~80%) at high E (MeV) and cold energie (30%). Conclusions Slide 41 Cryostat insertion Water CH 4 Al Polyethylene PT-410 50 cm Slide 42 Moderator Assembly Water CH 4 Al Poly PT-410 50 cm Slide 43 Moderator Cryogenic Tests P(W) T4 (K) T3(K) 0.0 4.9 3.8 1.0 7.3 5.9 2.0 * 8.9 7.2 3.0 10.2 8.3 4.0 11.3 9.1 5.0 12.3 10.0 T3 T4 Dec. 2004 * Estimated thermal load at 30kW Slide 44 Slide 45 First Cold Spectrum (T=3.6K) Slide 46 Solid Methane Spectrum Slide 47 Thermal Flux Measurements Location Measurement Method Flux (n/cm 2 /uC) (E Fast Neutron Flux (>12keV) 32kW beam power Slide 50 Nickel Foil XY Position Dependence (MCNP) Slide 51 Nickel Foil Activity Location Measurement Method Saturated Activity (Bq/atom/uC) MCNP As-Built Geometry As-Built Geometry As- Built /Meas 10 cm in TMR Nickel Foil Activity Empty Moderator (1.17.19) x10 -19 2.10 x10 -19 1.79 Activation Cross-section Slide 52 LENS is a novel facility for producing and using neutrons on a human scale. IAEA LENS is a novel facility for producing and using neutrons on a human scale. IAEA It offers unique opportunities in neutronic and instrumentation development as well as for materials research It offers unique opportunities in neutronic and instrumentation development as well as for materials research Neutronic performance is within 10% of predictions at low E (thermal), but discrepancy is greater (~80%) at high E (MeV) and cold energie (30%). Neutronic performance is within 10% of predictions at low E (thermal), but discrepancy is greater (~80%) at high E (MeV) and cold energie (30%). Conclusions