Impact of beam ions on α-particle measurements by collective Thomson scattering in ITER

J. Egedal; H. Bindslev; R.V. Budny; P. Woskov

doi:10.1088/0029-5515/45/3/005

Impact of beam ions on α-particle measurements by collective Thomson scattering in ITER

J. Egedal, H. Bindslev, R.V. Budny, P. Woskov

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Abstract

Collective Thomson scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born a-distributions in ITER. However, the velocities of the planned 1 MeV deuterium heating beam ions in 1TER are similar to that of fusion born a-particles and may therefore mask the measurements of the fusion products. We apply a new technique for calculating the orbit averaged source, (S), of beam ions for various ITER scenarios. With the known (S) Fokker-Planck modelling is applied to characterize the beam ions during the slowing down process. Theoretical CTS signals for both beam ions and the alpha-particles are calculated. Our investigations show that the CTS measurements of alpha-particles will not be masked by the presence of the beam ions in H-mode plasmas. In lower density reversed shear plasmas, only a part of the CTS alpha-particle spectrum will be perturbed.

Original language	English
Journal	Nuclear Fusion
Volume	45
Issue number	3
Pages (from-to)	191-200
ISSN	0029-5515
DOIs	https://doi.org/10.1088/0029-5515/45/3/005
Publication status	Published - 2005

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title = "Impact of beam ions on α-particle measurements by collective Thomson scattering in ITER",

abstract = "Collective Thomson scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born a-distributions in ITER. However, the velocities of the planned 1 MeV deuterium heating beam ions in 1TER are similar to that of fusion born a-particles and may therefore mask the measurements of the fusion products. We apply a new technique for calculating the orbit averaged source, (S), of beam ions for various ITER scenarios. With the known (S) Fokker-Planck modelling is applied to characterize the beam ions during the slowing down process. Theoretical CTS signals for both beam ions and the alpha-particles are calculated. Our investigations show that the CTS measurements of alpha-particles will not be masked by the presence of the beam ions in H-mode plasmas. In lower density reversed shear plasmas, only a part of the CTS alpha-particle spectrum will be perturbed. ",

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T1 - Impact of beam ions on α-particle measurements by collective Thomson scattering in ITER

AU - Egedal, J.

AU - Bindslev, H.

AU - Budny, R.V.

AU - Woskov, P.

PY - 2005

Y1 - 2005

N2 - Collective Thomson scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born a-distributions in ITER. However, the velocities of the planned 1 MeV deuterium heating beam ions in 1TER are similar to that of fusion born a-particles and may therefore mask the measurements of the fusion products. We apply a new technique for calculating the orbit averaged source, (S), of beam ions for various ITER scenarios. With the known (S) Fokker-Planck modelling is applied to characterize the beam ions during the slowing down process. Theoretical CTS signals for both beam ions and the alpha-particles are calculated. Our investigations show that the CTS measurements of alpha-particles will not be masked by the presence of the beam ions in H-mode plasmas. In lower density reversed shear plasmas, only a part of the CTS alpha-particle spectrum will be perturbed.

AB - Collective Thomson scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born a-distributions in ITER. However, the velocities of the planned 1 MeV deuterium heating beam ions in 1TER are similar to that of fusion born a-particles and may therefore mask the measurements of the fusion products. We apply a new technique for calculating the orbit averaged source, (S), of beam ions for various ITER scenarios. With the known (S) Fokker-Planck modelling is applied to characterize the beam ions during the slowing down process. Theoretical CTS signals for both beam ions and the alpha-particles are calculated. Our investigations show that the CTS measurements of alpha-particles will not be masked by the presence of the beam ions in H-mode plasmas. In lower density reversed shear plasmas, only a part of the CTS alpha-particle spectrum will be perturbed.

KW - 2-E tekno

U2 - 10.1088/0029-5515/45/3/005

DO - 10.1088/0029-5515/45/3/005

M3 - Journal article

SN - 0029-5515

VL - 45

SP - 191

EP - 200

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

ER -

Impact of beam ions on α-particle measurements by collective Thomson scattering in ITER

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