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

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

3. Neutron Sources From :G. Bauer LENS

4. From R. Pynn, UCSB

5. ISIS ILL

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

7. Protein Interactions (in solution!) JK Krueger et al. Biochem. 37, 13997 (1998) Calmodulin and myosin L C Kinase IKIK I CK ICIC

8. n Source Reactions

9. p + Be Reaction p + Be Reaction 13 MeV 2006 Yield ~ 0.007 n/p@13 MeV ~.0015 n/p @ 7MeV 7 MeV

10. Primary Source characteristics

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

12. p + Be Reaction p + Be Reaction 13 MeV 2006 Yield ~ 0.007 n/p@13 MeV ~.0015 n/p @ 7MeV 7 MeV

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 (???)

14. IUCF

15. IUCF

16. LENS at IUCF

17. Facility Layout: Fall 2005

20. Missions

21. SANS SESAME aCORN NREP LENS Floor Plan-2007 Accelerator TMR future

22. MCNP model geometry

24. Neutronic basics Time scales decoupler

25. Target Moderator Reflector (TMR)

26. (TMR)

29. Moderator Thickness Study Cryogenics Cavity 1.0 Cm Thick (present configuration) 2.0 cm Thick (proposed change included in study)

30. Moderator Thickness

31. Methane Thickness (MCNP)

32. Effect of Geometry details

34. Protons in linac: 15 Dec. 2004 Proton Current RFQ power DTL Power

35. Neutrons in 2-D Detector: 15 Dec. 2004

36. First Neutron Spectra Activation Foil here 3 He detector here

37. Empty moderator spectrum

38. Emission time predictions

39. Emission time measurements

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

41. Cryostat insertion Water CH 4 Al Polyethylene PT-410 50 cm

42. Moderator Assembly Water CH 4 Al Poly PT-410 50 cm

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

45. First Cold Spectrum (T=3.6K)

46. Solid Methane Spectrum

47. Thermal Flux Measurements Location Measurement Method Flux (n/cm 2 /uC) (E<500meV) MCNP Design Geometry MCNP As-Built Geometry As-Built Geometry As-Built /Meas 10 cm in TMR Gold Foil Poly Moderator (3.01±.78) x10 6 5.94 x10 6 3.79 x10 6 1.26 10 cm in TMR Gold Foil Empty Moderator (2.65±.75) x10 6 6.01 x10 6 3.58 x10 6 1.35 140 cm Indium Foil, Poly Moderator (3.36±.35) x10 3 13.6 x10 3 4.37 x10 3 1.30

48. Thermal Flux XY Position Dependence (MCNP)

49. Fast Neutron Flux (>12keV) 32kW beam power

50. Nickel Foil XY Position Dependence (MCNP)

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

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