Alpha-Particle Measurements Needed for Burning Plasma Experiments

Young, K. M.

doi:10.1007/978-1-4419-8696-2_9

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Although S 0 in [9] is provided as a function of the constants of motion p φ = q + mv RB φ /B and µ = 0.5mv 2 ⊥ /B, we can evaluate p φ and µ as a function of the major radius, R, and the pitch angle parameter, ξ m . As shown in figure 2 we obtain S 0 as a function of (R, ξ m ) for the planned H-mode scenario for which the key plasma parameters are given in figure 3.…”

Section: Beam Ions In Itermentioning

confidence: 99%

“…, 0.9}. The steady state distributions of α-particles is readily evaluated at the birth velocity, v α by considering equation (2). After orbit averaging, integration in v (over the width of the source δ-function:…”

Section: α-Particles In Itermentioning

confidence: 99%

“…Collective Thomson scattering (CTS) is one of the few diagnostic techniques which has the potential to provide spatially resolved information on the α-particles from which their distributions may be determined [1]. Alternative proposed α-particle diagnostics methods using neutral beams or pellet injection [2][3][4] may not be practical for implementation on ITER, nor as capable as CTS to provide as much fast ion detail.…”

Section: Introductionmentioning

confidence: 99%

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

Egedal

Bindslev²,

Budny

et al. 2005

Nucl. Fusion

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Collective Thomson scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born α-distributions in ITER. However, the velocities of the planned 1 MeV deuterium heating beam ions in ITER are similar to that of fusion born α-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 α-particles are calculated. Our investigations show that the CTS measurements of α-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 α-particle spectrum will be perturbed.

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Section: Beam Ions In Itermentioning

confidence: 99%

Section: α-Particles In Itermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Egedal

Bindslev²,

Budny

et al. 2005

Nucl. Fusion

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“…This section will concentrate on the measurements necessary for the study of burning plasmas [24]. Measurements of fast ions generated by auxiliary heating systems, such as neutral beams or radio frequency resonance heating, are essential for understanding the heating and transport processes of these particles.…”

Section: Iid Energetic Particle and Burning Plasma Diagnosticsmentioning

confidence: 99%

Plasma Measurements: An Overview of Requirements and Status

Young¹

2008

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This paper introduces this special issue on plasma diagnostics for magnetic fusion devices. Its primary purpose is to relate the measurements of plasma parameters to the physics challenges to be faced on operating and planned devices, and also to identify the diagnostic techniques that are used to make these measurements. The specific physics involved in the application of the techniques will be addressed in subsequent chapters.This chapter is biased toward measurements for tokamaks because of their proximity to the burning plasma frontier, and to set the scene for the development work associated with ITER. Hence, there is some emphasis on measurements for alpha-physics studies and the needs for plasma measurements as input to actuators to control the plasma, both for optimizing the device performance and for protection of the surrounding material.The very different approach to the engineering of diagnostics for a burning plasma is considered, emphasizing the needs for new calibration ideas, reliability and hardness against, and compatibility with, radiation. New ideas take a long time to be converted into "work-horse" sophisticated diagnostics so that investment in new developments is essential for ITER, particularly for the measurement of alpha-particles

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