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Author Esposito, B. ♦ Bertalot, L. ♦ Loughlin, M. ♦ Roquemore, A. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ TOKAMAK DEVICES ♦ TRITIUM ♦ PLASMA DIAGNOSTICS ♦ JET TOKAMAK ♦ DEUTERIUM ♦ NEUTRON SPECTRA ♦ MEV RANGE 10-100 ♦ MEV RANGE 01-10
Abstract The JET activation system has eight irradiation ends where samples may be irradiated in the neutron flux from the plasma. There is one end, re-entrant into the top of the vessel, for which there is little intervening material between it and the plasma; the other ends, including two beneath the divertor coils, have increasingly larger amounts of intervening structure. The local neutron spectrum at each irradiation end was measured by simultaneously activating several elemental foils (Al, Au, Co, Fe, In, Mg, Nb, Ni, Ti, Zr). There were 15 activation reactions in the energy range of 0.5{endash}16 MeV which were used as input to the SNL-SAND-II code to determine the neutron energy spectrum. The results are compared with neutron transport calculations both from the MCNP and FURNACE codes: the average standard deviation between measured to SNL-SAND-II calculated activity ratios was as low as 5{percent}. The results demonstrate the reliability of the neutronics calculations and have implications for the design of diagnostics and blankets for the next generation of large tokamaks such as ITER. The 377.9 keV line of the {sup 54}Fe(n,2n){sup 53}Fe reaction (threshold {approximately}13.9 MeV, not a dosimetric standard) has also been measured in different plasma conditions. The ratio of the saturated activity from this reaction to that from the {sup 56}Fe(n,p){sup 56}Mn reaction (threshold {approximately}4.5 MeV) provides information on the broadening of the 14 MeV fusion peak. {copyright} {ital 1999 American Institute of Physics.}
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-01-01
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 70
Issue Number 1
Technical Publication No. CONF-980605-


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