Investigation of the parameters of neutron filters

Kiptilyi, V. G.; Livke, Alexander; Nagornyi, V. I.; Nefedov, Yu. Ya.; Savin, M.V.; Semenov, V. I.; Chirkin, V. A.

doi:10.1134/1.1259008

Cited by 17 publications

(17 citation statements)

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“…74 Measurements from JET experiments in recent years indicate that the gamma-ray diagnostics work well, but further substantial improvement of the diagnostics is proposed for measurements in highperformance D and D-T discharges to demonstrate the capabilities of gamma-ray diagnostics for burning plasma physics in future reactors. In particular, the development of gamma-ray spectrometers based on fast heavy scintillators and of a data acquisition system with fast digitizers 78 and the installation of the efficient neutron attenuators 79 has been proposed. The main goals of this project are improving the energy and temporal resolution of the diagnostics and reducing the gamma-ray background.…”

Section: Vc Gamma-ray Spectroscopy and Gamma-ray Tomography In Jet mentioning

confidence: 99%

Chapter 5: Burning Plasma Studies at JET

Sharapov

Eriksson

Fasoli

et al. 2008

Fusion Science and Technology

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Section: Vc Gamma-ray Spectroscopy and Gamma-ray Tomography In Jet mentioning

confidence: 99%

Chapter 5: Burning Plasma Studies at JET

Sharapov

Eriksson

Fasoli

et al. 2008

Fusion Science and Technology

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“…The presence of the 4.44-MeV peak in γ-ray spectra is evidence for the existence of alphas with energies that exceed 1.7 MeV. These measurements also indicate a surprisingly high level of the γ-ray emission from the reaction 12 C(d,pγ) 13 C meaning that some ICRH power was absorbed by deuterons at the third harmonic D-resonance, which coincides with the 3 rd harmonic 4 He-resonance. The fast D-ions give rise to 3.09-MeV γ-rays from the reaction 12 C(d,pγ) 13 C. A peak at 3.09 MeV in recorded spectra reflects the presence in the plasma of fast D-ions with energies exceeding 0.5 MeV.…”

Section: Alpha-particle Confinement and Lossesmentioning

confidence: 69%

“…It does not produce interfering γ-rays in the high-energy range. A 30-cm sample of the 6 LiH-filter reduces 2.4-MeV neutron flux ∼900 times and the 15-MeV neutron flux ∼30 times [13].…”

Section: Possible Implementation Of γ-Diagnostics In Itermentioning

confidence: 93%

Fast ion JET diagnostics: confinement and losses

Kiptily¹,

Borba²,

Cecil³

et al. 2008

AIP Conference Proceedings

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Abstract. A study of magnetically confined fast ions in tokamaks plays an important role in burning plasma research. To reach ignition and steady burning of a reactor plasma an adequate confinement of energetic ions produced by NBI heating, accelerated with ICRF and born in fusion reactions is essential to provide efficient heating of the bulk plasma. Thus, investigation of the fast ion behaviour is an immediate task for present-day large machines, such as JET, in order to understand the main mechanisms of slowing down, redistribution and losses, and to develop optimal plasma scenarios. Today's JET has an enhanced suite of fast ion diagnostics both of confined and lost ions that enable to significantly contribute to this important area of research. Fast ion populations of p, d, t, 3 He and 4 He, made with ICRF, NBI, and fusion reactions have been investigated in experiments on JET with sophisticated diagnostics in conventional and shear-reversed plasmas, exploring a wide range of effects. This paper will introduce to the JET fast-ion diagnostic techniques and will give an overview of recent observations. A synergy of the unique diagnostic set was utilised in JET, and studies of the response of fast ions to MHD modes (e.g. tornado modes, sawtooth crashes), fast 3 He-ions behaviour in shearreversed plasmas are impressive examples of that. Some results on fast ion losses in JET experiments with various levels of the toroidal field ripple will be demonstrated.

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“…It does not produce interfering -rays in the high-energy range. A 30-cm sample of the 6 LiH-filter reduces 2.5-MeV neutron flux 900 times and the 15-MeV neutron flux 30 times [14]. The attenuator has been tested in JET experiments with deuterium plasmas [15].…”

Section: Gamma-ray Spectrometersmentioning

confidence: 99%

Fusion alpha-particle diagnostics for DT experiments on the joint European torus

Kiptily

Beaumont

Belli

et al. 2014

AIP Conference Proceedings

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JET equipped with ITER-like wall (a beryllium wall and a tungsten divertor) can provide auxiliary heating with power up to 35MW, producing a significant population of-particles in DT operation. The direct measurements of alphas are very difficult and-particle studies require a significant development of dedicated diagnostics. JET now has an excellent set of confined and lost fast particle diagnostics for measuring the α-particle source and its evolution in space and time, α-particle energy distribution, and α-particle losses. This paper describes how the above mentioned JET diagnostic systems could be used for-particle measurements, and what options exist for keeping the essential-particle diagnostics functioning well in the presence of intense DT neutron flux. Also, α-particle diagnostics for ITER are discussed.

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Investigation of the parameters of neutron filters

Cited by 17 publications

References 0 publications

Chapter 5: Burning Plasma Studies at JET

Chapter 5: Burning Plasma Studies at JET

Fast ion JET diagnostics: confinement and losses

Fusion alpha-particle diagnostics for DT experiments on the joint European torus

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