First gamma-ray measurements of fusion alpha particles in JET trace tritium experiments

被引：53

作者：

Kiptily, VG ^{[1
]}

Baranov, YF

Barnsley, R

Bertalot, L

Hawkes, NC

Murari, A

Popovichev, S

Sharapov, SE

Stork, D

Yavorskij, V

机构：

[1] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] EURATOM, ENEA, CNR Fus, Rome, Italy

[3] Consorzio RFX, EURATOM Assoc, Enea Fus, I-35127 Padua, Italy

[4] Univ Innsbruck, Inst Theoret Phys, Euratom OEAW Assoc, A-6020 Innsbruck, Austria

[5] Ukrainian Acad Sci, Inst Nucl Res, UA-252028 Kiev, Ukraine

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 11期

基金：

欧盟地平线“2020”; 英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.93.115001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Gamma-ray spectra from nuclear reactions between fusion-born alpha (alpha) particles and Be impurities were measured for the first time in deuterium-tritium plasmas in the Joint European Torus. The time dependence of the measured spectra allowed the determination of the density evolution of fast alpha particles. Correlation between the decay time of the gamma-ray emission and the plasma parameters in different plasma scenarios was established. Results are consistent with classical slowing down of the alpha particles in discharges with high plasma currents and monotonic q-profiles. In low plasma current discharges and in the discharges with large on-axis current holes (extreme reversal central magnetic shear), the gamma-ray emission decay times are shorter than the classical slowing down times, indicating an alpha-particle confinement degradation in such discharges in line with theoretical predictions.

引用

页码：115001 / 1

页数：4

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