In-vessel activation monitors in JET: Progress in modeling

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2968099· OSTI ID:21266493

Bonheure, Georges ^[1]; Lengar, I ^[2]; Syme, B; Popovichev, S ^[3]; Wieslander, Elisabeth; Hult, Mikael; Gasparro, Joeel; Marissens, Gerd ^[4]; Arnold, Dirk ^[5]; Laubenstein, Matthias ^[6]

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1. Laboratory for Plasma Physics, Association 'Euratom-Belgian State', Avenue de la Renaissance 30, B-1000 Brussels (Belgium)
2. Slovenian Fusion Association, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana (Slovenia)
3. Euratom/UKAEA Association, Culham Science Centre, Abingdon, OX14 3DB Oxon (United Kingdom)
4. EC-JRC-IRMM, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel (Belgium)
5. Physikalisch-Technische Bundesanstalt, 6.1 Radioactivity, Bundesallee 100, D-38116 Braunschweig (Germany)
6. Laboratori Nazionali del Gran Sasso, S.S, 17/bis, km 18-910, I-67010 Assergi (Italy)

Activation studies were performed in JET with new in-vessel activation monitors. Though primarily dedicated to R and D in the challenging issue of lost {alpha} diagnostics for ITER, which is being addressed at JET with several techniques, these monitors provide for both neutron and charged particle fluences. A set of samples with different orientation with respect to the magnetic field is transported inside the torus by means of a manipulator arm (in contrast with the conventional JET activation system with pneumatic transport system). In this case, radionuclides with longer half-life were selected and ultralow background gamma-ray measurements were needed. The irradiation was closer to the plasma and this potentially reduces the neutron scattering problem. This approach could also be of interest for ITER, where the calibration methods have yet to be developed. The MCNP neutron transport model for JET was modified to include the activation probe and so provide calculations to help assess the new data. The neutron induced activity on the samples are well reproduced by the calculations.

• OSTI ID: 21266493
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 10; Conference: HTPD08: 17. topical conference on high-temperature plasma diagnostics, Albuquerque, NM (United States), 11-15 May 2008; Other Information: DOI: 10.1063/1.2968099; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
22 GENERAL STUDIES OF NUCLEAR REACTORS
CALIBRATION
CONTAINERS
GAMMA RADIATION
ITER TOKAMAK
MAGNETIC FIELDS
MANIPULATORS
MONITORS
NEUTRON DIFFRACTION
NEUTRON TRANSPORT
NEUTRONS
PLASMA
PLASMA DIAGNOSTICS
PNEUMATIC TRANSPORT
RADIOISOTOPES
SIMULATION