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Neutron emission fr...
Neutron emission from beryllium reactions in JET deuterium plasmas with 3He minority
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- Gatu Johnson, Maria, 1978- (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Hellesen, Carl (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Andersson Sundén, Erik (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Cecconello, Marco (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Conroy, Sean (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Ericsson, Göran (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Gorini, Giuseppe (author)
- Physics Department, Milano-Bicocca University, and Istituto di Fisica del Plasma del CNR, Milan, Italy (EURATOM-ENEA-CNR Association)
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- Kiptily, Vasily (author)
- Euratom / UKAEA Fusion Association, Culham Science Centre, Abingdon, United Kingdom
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- Nocente, Massimo (author)
- Physics Department, Milano-Bicocca University, and Istituto di Fisica del Plasma del CNR, Milan, Italy (EURATOM-ENEA-CNR Association)
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- Pinches, Simon (author)
- Euratom / UKAEA Fusion Association, Culham Science Centre, Abingdon, United Kingdom
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- Ronchi, Emanuele (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Sharapov, Sergei (author)
- Euratom / UKAEA Fusion Association, Culham Science Centre, Abingdon, United Kingdom
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- Sjöstrand, Henrik (author)
- Uppsala universitet,Tillämpad kärnfysik
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- Tardocchi, Marco (author)
- Physics Department, Milano-Bicocca University, and Istituto di Fisica del Plasma del CNR, Milan, Italy (EURATOM-ENEA-CNR Association)
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- Weiszflog, Matthias (author)
- Uppsala universitet,Tillämpad kärnfysik
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(creator_code:org_t)
- 2010-03-26
- 2010
- English.
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In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 50:4, s. 045005-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Recent fast ion studies at JET involve ion cyclotron resonance frequency (ICRF) heating tuned to minority He-3 in cold deuterium plasmas, with beryllium evaporation in the vessel prior to the session. During the experiments, the high-resolution neutron spectrometer TOFOR was used to study the energy spectrum of emitted neutrons. Neutrons of energies up to 10MeV, not consistent with the neutron energy spectrum expected from d(d,n)He-3 reactions, were observed. In this paper, we interpret these neutrons as a first-time observation of a Be-9(He-3, n)C-11 neutron spectrum in a tokamak plasma, a conclusion based on a consistent analysis of experimental data and Monte Carlo simulations. Be-9(a, n)C-12 and Be-9(p, n)B-9 reactions are also simulated for p and a fusion products from d(He-3, a) p reactions; these two-step processes are seen to contribute on a level of about 10% of the single-step process in Be-9(He-3, n) C-11. Contributions to the total neutron yield from the Be-9(3He, n)C-11 reaction are found to be in the range 13 +/- 3 to 57 +/- 5%. We demonstrate how TOFOR can be used to simultaneously (i) probe the deuterium distribution, providing reliable measurements of the bulk deuterium temperature, here in the range 3.2 +/- 0.4 to 6.3 +/- 1.0 keV and (ii) provide an estimate of the beryllium concentration (in the range 0.48 +/- 0.17 to 6.4 +/- 1.7% of n(e) assuming T-3He = 300 keV). The observation of Be-9 related neutrons is relevant in view of the upcoming installation of a beryllium-coated ITER-like wall on JET and for ITER itself. An important implication is possible neutron-induced activation of the ITER vessel during the low-activation phase with ICRF heating tuned to minority He-3 in hydrogen plasmas.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- PACS codes: 29.30.Hs
- 29.25.Dz
- 52.55.-s
- 52.55.Fa
- 25.55.-e
- 52.55.Pi
- Physics
- Fysik
- Fysik med inriktning mot tillämpad kärnfysik
- Physics with specialization in Applied Nuclear Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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Gatu Johnson, Ma ...
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Hellesen, Carl
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Andersson Sundén ...
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Cecconello, Marc ...
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Conroy, Sean
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Ericsson, Göran
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Gorini, Giuseppe
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Kiptily, Vasily
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Nocente, Massimo
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Pinches, Simon
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Ronchi, Emanuele
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Sharapov, Sergei
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Sjöstrand, Henri ...
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Tardocchi, Marco
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Weiszflog, Matth ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Nuclear Fusion
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Uppsala University