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Proposed Neutron Emission Spectroscopy Diagnostics of Energetic Deutrons in JET rium Plasmas
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Neutron Research. Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Neutron Research. Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Neutron Research. Department of Physics and Astronomy, Applied Nuclear Physics.
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2001 (English)In: 7th IAEA TCM on Energetic Particles, 2001Conference paper, Published paper (Other scientific)
Abstract [en]

The DT experimental campaign on JET (1997) represented a major step forward for neutron emission

spectroscopy (NES) diagnostics thanks to the high count rate measurements obtained with the

magnetic proton recoil (MPR) neutron spectrometer in high fusion yield plasmas [1]. NES

measurements were made on JET DT plasmas for different heating conditions including those

generating energetic deuterons either directly through NB injection, or through ICRH acceleration

using the (D)T minority scheme [2]. A multiple-component model has been developed for analysis

of dt neutron spectra that is based on a simplified description of fuel ion velocity distributions for

different heating conditions [3,4]. The same model is used here for projections of NES spectra from

JET deuterium plasmas using the dt results as input. This is done on the basis of a system of two

complementary NES instruments, the TOFOR (Time of Flight - Optimized Rate) [5] and MPRu

(Magnetic Proton Recoil Upgrade) spectrometers that are presently proposed for installation on

JET [6]. Both spectrometers would record neutron spectra in D plasmas but for different viewing

lines. TOFOR would have a “vertical” view, i.e. at an angle of 90° relative to the toroidal magnetic

field. This is the same viewing line used for some of the previous dd NES measurements on JET

[7]. MPRu would have a “tangential” view, i.e. horizontal (on the equatorial plane) at an angle of

47° relative to the toroidal magnetic field and opposite to the beam injection direction. This is the

same viewing line used for the 1997 dt measurements using the magnetic proton recoil (MPR)

spectrometer.

Projections of dd neutron spectra under the assumptions above are used here for an assessment

of the performance and requirements of NES as a diagnostic of energetic deuterons in JET.

Place, publisher, year, edition, pages
2001.
Keyword [en]
nuclear fusion, plasma physics, neutron emission, neutron spectroscopy, MPR neutron spectrometer, TOFOR neutron spectrometer, D plasma, DT plasma, ICRH heating, NBI heating
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-75851OAI: oai:DiVA.org:uu-75851DiVA: diva2:103762
Available from: 2006-02-21 Created: 2006-02-21

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http://www.iop.org/Jet/fulltext/EFDC010809.pdf

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Conroy, SeanEricsson, GöranGiacomelli, LucaHjalmarsson, AndersKällne, Jan

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