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Uppsala University

JET results on the determination of thermal/non-thermal fusion yield from neutron emission spectroscopy. Giuseppe Gorini on behalf of. Uppsala University Istituto di Fisica del Plasma “Piero Caldirola”,CNR & Milano-Bicocca University, Milano, Italy EFDA JET Collaborators.

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Uppsala University

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  1. JET results on the determination of thermal/non-thermal fusion yield from neutron emission spectroscopy Giuseppe Gorini on behalf of Uppsala University Istituto di Fisica del Plasma “Piero Caldirola”,CNR & Milano-Bicocca University, Milano, Italy EFDA JET Collaborators G.Gorini

  2. Issue: Thermal and non-thermal neutron yield (Q value)used nowadays for physics analysis of fusion plasmas (e.g. JET). Not measured.Qnth/Qth desirable measurement on ITER.Can Neutron Emission Spectroscopy determinethe thermal and non-thermal neutron yield and their ratio?Here: JET results from selected D dischargeswith NBI heating. G.Gorini

  3. TOFOR neutron spectromer TOFOR is a new 2.5 MeV Time-Of-Flight neutron spectrometer Optimized for high Rate operation (>200 kHz range) neutrons G.Gorini

  4. TOFOR neutron spectra • Main features in the measured TOF spectrum: • Broad component (e.g. due to NBI deuterons) • Low energy tail due to neutron scattering • Higher energy neutrons: missing in the absence of RF heating #69242, D plasma, NB heating, single injector tof[ns] G.Gorini

  5. TOFOR neutron spectra (linear scale) #69242, D plasma, NB heating, single injector G.Gorini

  6. NBI in JET • Full model in TRANSP G.Gorini

  7. TRANSP • Input experimental data • Simulation of: • Equilibrium • Trasport • Fast ion dynamics • Radiation emission etc (e.g. for diagnostic comparison) • NUBEAM G.Gorini

  8. NUBEAM Motion of particles Neutral deposition Ionizzation Orbits Collisions and thermalization G.Gorini

  9. Control Room • Control Room is a MonteCarlo code first developed in 1994. • The original system consisted on a C++ library and a few applications • whose purpose was the calculation of slowing-down ion distributions and the resulting neutron emission in thermonuclear plasmas. • Now it is possible to use the library from within the Python programming language. In fact, one could say the library was designed for being used as a Python module. This gives the user a number of advantages. On the • one hand, this allows one to test-drive the library through the interactive • Python interpreter and makes it easier to experiment with its features. On the other hand, this enables the user to write simple scripts. G.Gorini

  10. Example of spectrum #69625 t = 58 s. G.Gorini

  11. TOFOR data Pulse: 69652 PNBI = 13 MW Ip = 2.6 MA BT = 2.2 T T= 1.7 keV Chi2 = 0.98 G.Gorini

  12. Pulse G.Gorini

  13. MissingNeutrons G.Gorini

  14. MissingNeutrons G.Gorini

  15. Yth/Ynth G.Gorini

  16. Role of sight line To what extent is the plasma volume seen by TOFOR representative of the TOTAL volume? Equation: y = a*(x-b) R2 = 0.98364 a = 1.216 ± 0.02391 b= 0.00269 ± 0.00369 G.Gorini

  17. Conclusions TRANSP-based accurate simulation of neutron emission spectra with thermal and non-thermal components. Separation of thermal/non-thermal components possible. Accuracy depends on shape difference. On ITER shape will be very different => separation easier. G.Gorini

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