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Construction of the IREN 1-st stage

Construction of the IREN 1-st stage. V. Shvetsov FLNP. TOC. Brief history of the IREN project Decision on project reduction IREN 1-st stage parameters Scientific program for the IREN 1-st stage Tasks completed in 2006-2007 Accident with SLAC 5045 klystron – consequences & decision fork

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Construction of the IREN 1-st stage

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  1. Construction of the IREN 1-st stage V. Shvetsov FLNP

  2. TOC • Brief history of the IREN project • Decision on project reduction • IREN 1-st stage parameters • Scientific program for the IREN 1-st stage • Tasks completed in 2006-2007 • Accident with SLAC 5045 klystron – consequences & decision fork • Conclusion JINR SC 102-nd session

  3. IREN history • Project started in 1993 with 3 years schedule, was approved by the CPP • 1015 n/s integral intensity at 400 ns pulse width promised 30-50 gain in source quality in comparison with IBR-30 • Designed parameters put IREN in range with most intensive resonance neutron sources (LANSCE, ORELA, GELINA) JINR SC 102-nd session

  4. IREN history • Within 1993-1997 project financing formed k$ 870 at designed budget cost M$ 3.7 • Within 1998 – 2005 project financing reached about M$ 2.4, but the project cost also raised seriously due to inflation and was estimated about M$ 5.3 • At that time about 80% of accelerator equipment (including accelerating sections) were delivered to JINR; fuel elements were manufactured and delivered to JINR; IBR-30 was decommissioned JINR SC 102-nd session

  5. Decision on project reduction • In the end of 2005 becomes clear that resources of the “Neutron Nuclear Physics” scientific direction are not sufficient for project realization • FLNP directorate proposed to reduce the project down to electron linac with nonmultiplying target • It was discussed at the JINR Directorate meeting (October 13 2005) and JINR Scientific Council 99-th session (January 19-20 2006) • “The Scientific Council recommends that the Directorate and this PAC [on nuclear physics] estimate the impact of this choice on the excellence of the scientific programme which may be reduced. “ JINR SC 102-nd session

  6. Decision on project reduction • Scientific program for reduced IREN project was reported at the 24-th meeting of the PAC for Nuclear Physics (April 6-7 2006) • “The PAC recommends that the JINR and FLNP directorates maintain the momentum of the project implementation, extend cooperation with other laboratories and institutions to construct by the end of 2007 the 1-st stage of IREN, including the electron accelerator, the stand for applied research and the neutron production target” • At the 101-st session of JINR SC the following resolution was approved: “The Scientific Council is pleased to hear that the construction of Phase I of the IREN facility is progressing on schedule and looks forward to the commissioning of IREN in late 2007. It would like to hear more about the scientific opportunities presented by Phase I of IREN.” JINR SC 102-nd session

  7. IREN 1-st stage parameters Initial data: E=100 MeV, I=2.5 A, dt=100 ns, f=50(150) Hz JINR SC 102-nd session

  8. IREN 1-st stage parameters Neutron flux density at sample position: JINR SC 102-nd session

  9. IREN 1-st stage parameters IREN neutronics JINR SC 102-nd session

  10. IREN 1-st stage parameters Gamma-source at IREN 1015 s-1 JINR SC 102-nd session

  11. IREN 1-st stage parameters Irradiation channels for NAA Thermal neutrons spatial distribution (5.7-6.3)*109 n/cm2*s JINR SC 102-nd session

  12. Neutron activation analysis Construction of the IREN Fundamental symmetries In neutron induced reactions Neutrons in space Applied Ultracold neutrons Fundamental properties of the neutron Fundamental Highly excited states of the nuclei Nuclear fission JINR SC 102-nd session

  13. Scientific program for the IREN 1-st stage Isotopes production at IREN 1-st stage More than 50 isotopes could be efficiently produced at IREN gamma source with (gamma, n), (gamma, 2n), (gamma, p) reactions FLNR experience in particular isotopes: Yield calculated for IREN 1-st stage from experimental data obtained at FLNR microtron JINR SC 102-nd session

  14. Monitors (Zr, Au, Mo) Samples: Natural tin 163.5 mg 118Sn (98.5%) 30.4 mg Monitors (Zr, Au, Mo) Scientific program for the IREN 1-st stage Isotopes production at IREN 1-st stage RSA ( NECSA) proposal 118Sn(,n)117mSn Experiment performed in Feb. – March 2007 at FLNR Microtron accelerator JINR SC 102-nd session

  15. 117mSn Gamma spectra from enriched tin sample Scientific program for the IREN 1-st stage Recoil energy ~1 keV - Investigations on chemical process for 117mSn extraction are in progress. RSA students and young scientists will join in the end of 2007 JINR SC 102-nd session

  16. Scientific program for the IREN 1-st stage Preliminary results of 117mSn production using FLNR Microtron electron accelerator JINR SC 102-nd session

  17. Scientific program for the IREN 1-st stage Neutron/gamma activation analysis IBR-2 will stop for modernization in 2007, sector of NAA is planning to continue research at IREN 1-st stage: • Biomonitoring • Material science • Biotechnology JINR SC 102-nd session

  18. Scientific program for the IREN 1-st stage (n,p), (n,alpha) reactions investigations at high energy JINR SC 102-nd session

  19. Scientific program for the IREN 1-st stage (n,p), (n,alpha) reactions investigations at high energy Nuclear physics Astrophysical aspects 35Cl(n,p)35S reaction cross section and forward-backward coefficient. Dashed lines indicate error corridor due to uncertainties of experimental data (solid squares) JINR SC 102-nd session

  20. Scientific program for the IREN 1-st stage Methodical research with polarized neutrons and nuclei 5-fold correlation, aligned nuclear target 3-fold correlation, polarized nuclear target • Orthogonality should be better than 10-4 • Nuclei polarization uniformity • Energy dependence of the false effects • IREN 1-st stage potential: • neutron polarization vector control with precision 0.7 10-3 rad/day • nuclei polarization – accuracy less than 1% per hour • False effects energy dependence within 0.2 – 5 eV interval with accuracy 1% JINR SC 102-nd session

  21. Tasks completed in 2006-2007 • Working projects of water/power supply, fire prevention, radiation safety and other systems were finished, necessary equipment manufactured or purchased; • Until November 2007 all engineering infrastructure in accelerator building will be installed; • Until November 2007 main control room and auxiliary rooms will be repaired and ready for equipment assembling • About 70% of LUE-200 equipment was mounted on site, partly tested and certified; • Nonmultiplying target is under construction and will be ready by the end of 2007. • JINR Directorate provides financing of the project in accordance with approved time schedule and project budget. JINR SC 102-nd session

  22. Accident with SLAC 5045 klystron – consequences & decision fork • Time schedule of the project was directed to the linac startup at the end of 2007. At present time one have to acknowledge that this goal will not be reached: in June 2007 during operation on SLAC 5045 klystron mounting it was severely damaged. It was the only klystron and we do not have possibility to replace it. JINR SC 102-nd session

  23. Accident with SLAC 5045 klystron – consequences & decision fork • One option to start IREN 1-st stage with lower energy of electrons is to adjust spare TH2129 klystron from Linac 800 accelerator. With one accelerating section electron energy 60-70 MeV instead of 100 MeV could be reached with the same average current and increased peak current. Neutron and gamma yield will be 1.7 – 2.1 times lower. • Work on integration of integration of the TH2129 klystron is in progress. Estimated time – about 3 months. JINR SC 102-nd session

  24. Accident with SLAC 5045 klystron – consequences & decision fork • Another option is to purchase from SLAC the klystron tube. • Negotiations with SLAC are in progress, cost of the klystron tube is k$ 350 + shipping and insurance. Delivery time – not earlier than February 2008 • This cost is twice more than annual project budget and to realize this option additional financing is necessary JINR SC 102-nd session

  25. Conclusion • The future of the project is seriously jeopardized by klystron accident; • Nevertheless, project management appeals to the Scientific Council with application to give us the chance and put IREN 1-st stage into operation starting with TH2129 klystron by the middle of 2008. JINR SC 102-nd session

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