Venice, September 21, 2004 K. Seidel,TU Dresden IEA collaboration in fusion neutronics Activities of TU Dresden 1. Activation of fusion reactor materials.

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Venice, September 21, 2004 K. Seidel,TU Dresden IEA collaboration in fusion neutronics Activities of TU Dresden 1. Activation of fusion reactor materials in fusion peak neutron field 2. Preparation of techniques for a TBM neutronics experiment

Venice, September 21, 2004 K. Seidel,TU Dresden Activation of fusion reactor materials in fusion peak neutron field Pb, as Pb-17Li in breeding blanket concepts Li irradiated in Li 4 SiO 4 pebbles → pure Pb investigated Contribution to SOFT-23 (P-179): Measurement and analysis of radioactivity induced in yttrium and lead in fusion peak neutron field K. Seidel, R. Eichin, R.A. Forrest, H. Freiesleben, and S. Unholzer Y, as Y 2 O 3 in ODS steels (high temperature and neutron flux) Low-activation steels EUROFER and F82H previously irradiated → pure Y

Venice, September 21, 2004 K. Seidel,TU Dresden Activation of fusion reactor materials in fusion peak neutron field Contact dose rate after irradiation with D-T neutrons of 1 MW/m 2 power density for one year as a function of the decay time.

Venice, September 21, 2004 K. Seidel,TU Dresden Activation of fusion reactor materials in fusion peak neutron field Results obtained for the activity: radionuclides identified, their half-life and the  -radiation used to determine the activity, the  -yield,the neutron reactions producing these nuclides, the ratios of calculated-to-experimental activity (C/E), obtained with the European Activation System EASY-2003, and the uncertainties of both the calculated and the experimental activities. Radio- nuclide Half-life E  (keV) Y  (%) Reaction Contr.(%) C/E  C/C (%)  E/E (%) 88 Y 90m Y d 3.19 h Y(n, 2n) Y(n,g) Hg 208 Tl 203 Pb 204m Pb 46.6 d 3.05 min 2.17 d 1.12 h Pb(n,  ) Pb(n,n’  ) Pb(n,p) Pb(n,2n) Pb(n,2n)IT Pb(n,n’)

Venice, September 21, 2004 K. Seidel,TU Dresden Preparation of techniques for a TBM neutronics experiment a)Measurement of tritium breeding rates Participation in the international comparison of measuring techniques with JAERI and ENEA - HTO samples - Li 2 CO 3 probes Contribution to SOFT-23 P. Batistoni, M. Angelone, P. Carconi, K. Ochiai, I. Schäfer, K. Seidel, Y. Verzilov, G. Zappa

Venice, September 21, 2004 K. Seidel,TU Dresden Preparation of techniques for a TBM neutronics experiment b) Measurement of neutron and  -ray flux spectra in the TBM mock-up Neutron flux spectrum and tritium production NT =  g NT g =  g (  g ·  g nt ) Flux spectrum calculated for the TBM mock-up  (E) spectral measurements for E = 1. – 14. MeV with NE213 spectrometer (+  -flux) for E = 50 keV – 1. MeV with H2 proportional counter for E < 50 keV ? 97% of the NT-Li6

Venice, September 21, 2004 K. Seidel,TU Dresden Preparation of techniques for a TBM neutronics experiment Neutron flux energy spectra for time-of-arrival groups t after DT neutron pulse of 10  s width Time-of-arrival spectrum with 3 He detector response

Venice, September 21, 2004 K. Seidel,TU Dresden Preparation of techniques for a TBM neutronics experiment Time-of arrival spectrum calculated for 3 He detector response 2004: Time-of-arrival spectroscopy shall be demonstrated with a LiAlPb assembly LiAl, Pb, PE