Fusion neutron energy spectra measured by time-of-flight spectrometers
2002 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 476, no 02-jan, 485-489 p.Article in journal (Refereed) Published
Evaluation of measured neutron energy spectra provides information on the central ion velocity distribution; e.g. ion temperature and fast ions induced by NBI- or ICR-heating and on impurity content in fusion grade plasmas. Two self-contained high-energy resolution time-of-flight neutron spectrometers have been used at the JET- and JT-60U tokamaks during DD-operation. In the spectrometers, each neutron undergoes (n, p) elastic scattering in two sets of hydrogen based scintillators. Elapsed time between the two scatter events is measured and the energy of the neutron is evaluated. Interpretation of acquired data together with results obtained from other diagnostics yields information on central plasma parameters. Deduced ion temperatures, fast ion fractional contributions during auxiliary NBI- and ICR-heating and impurity content is presented. In general, good agreement is obtained between neutron data and data from other diagnostics.
Place, publisher, year, edition, pages
2002. Vol. 476, no 02-jan, 485-489 p.
neutron, energy spectra, fusion, spectrometers, 2-component plasma, jet
IdentifiersURN: urn:nbn:se:kth:diva-21322DOI: 10.1016/S0168-9002(01)01494-2ISI: 000173885900086OAI: oai:DiVA.org:kth-21322DiVA: diva2:340020
QC 201005252010-08-102010-08-10Bibliographically approved