Use of the nuclear reaction for diagnostics of energetic particles in burning plasmas

✍ Scribed by M. Nakamura; Y. Nakao; V.T. Voronchev

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 315 KB
• Volume: 580
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2007.06.088

✦ Synopsis

Application of reaction-produced g-rays to diagnostics of energetic particles in burning plasmas is analyzed. Particularly, we focus on 0.981 MeV g-rays emitted in the 6 Liðt; p 1 gÞ 8 Li nuclear reaction solely governed in the plasmas by energetic tritons. It is shown that these g quanta can serve as a promising tool to diagnose a knock-on tritons and a-particles confined in burning DT plasmas. Key parameters of the a knock-on triton population and the a-particle confinement property can be obtained by comparing the experimental g-ray yield and spectrum with theoretical slowing-down calculations. Even if the g-ray spectral shape cannot be acquired, one can monitor densities of these tritons and a-particles at energies of 0.6-1.8 MeV and 2.0-3.5 MeV, respectively, in a nearly steady-state plasma. The 0.981-MeV photons also would help to display time evolution of the a-particle population in experiments of deuterium plasmas with pulsed tritium beam shots.