Measurements of neutral beam stopping for hydrogen and helium in the JT-60 plasma

K. Tobita, T. Itoh, A. Sakasai, Y. Kusama, Y. Ohara, Y. Tsukahara, M. Nemoto, Y. Kawano, H. Hubo, H. Takeuchi, T. Sugie

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5 Citations (Scopus)


Shine-through for hydrogen and helium beams in a plasma was measured. Shine-through for an atomic hydrogen beam with f1:f 2:f3=7%:32%:61% (where f1, f2 and f3 represent fractions of the full, half and third energy, respectively) and a full energy of 140 keV, was smaller than the value predicted by usual cross-sections without inclusion of excitation processes at an electron density (ne) above 3*1013 cm-3. A fractional beam stopping increment ( delta ), which was defined by delta =( sigma s- sigma s(0)) sigma s (0) (here sigma s was an experimental stopping cross-section and sigma s(0) was the cross-section without including multistep processes via excited states), was about 0.2 at n e=(3.1-5.0)*1013 cm-3 and Z eff=1.6-2.5. The value of delta was consistent with the calculation by Janev et al. (1989, Nucl. Fusion 29, 2125). For a 160-190 keV helium beam, the enhancement of the stopping cross-section was not observed, as expected.

Original languageEnglish
Article number002
Pages (from-to)429-441
Number of pages13
JournalPlasma Physics and Controlled Fusion
Issue number6
Publication statusPublished - 1990 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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