Thermal Load Calculations at TJ-II Vacuum Vessel under Neutral Beam Injection

Guasp, J.; Liniers, M.; Fuentes, C.; Barrera, G.

doi:10.13182/fst99-a75

Cited by 31 publications

(24 citation statements)

References 2 publications

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“…In future operations modes, its plasmas will receive up to 2 MW of additional heating from two neutral beam injector (NBI) systems in which neutral hydrogen is accelerated to 40 keV [11] and from which theoretical studies predict that losses due to fast ions could reach 30% of the injected power [12]. To date, diagnostics for detecting fast ion (H + ) losses from the hot plasmas of fusion devices, as well as fast alpha particle losses from D-T fusion devices [13], have employed thin phosphor screens, e.g.…”

Section: Introductionmentioning

confidence: 99%

The response of several luminescent materials to keV and MeV ions

McCarthy

López

Rey

et al. 2005

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

The response of several luminescent materials to keV and MeV ions

McCarthy

López

Rey

et al. 2005

Journal of Nuclear Materials

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“…With the impending coming on line of the second of TJ-II's two neutral beam injectors [16], as well as an Electron Bernstein Wave Heating system [17], the CXRS-DNBI diagnostic will be a powerful tool for the different heating scenario envisaged. Moreover, in the near future upgrades to the active diagnostic will be made in order to increase its scientific return.…”

Section: Discussionmentioning

confidence: 99%

A Systematic Study of Impurity Ion Poloidal Rotation and Temperature Profiles Using CXRS in the TJ-II Stellarator

Carmona¹,

McCarthy²,

Tribaldos³

et al. 2008

Plasma and Fusion Research

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A concise systematic study of impurity parameter profiles (impurity ion temperatures and poloidal velocities) measured under different plasma conditions has been carried out in the TJ-II stellarator using an active spectroscopic diagnostic system covering a large section of the central plasma minor radius, from r/a = 0.3 to 0.85, with high spatial resolution. For this, plasmas using hydrogen as the working gas were created and maintained using electron cyclotron resonance heating (from 400 to 500 kW) and line-averaged densities between 0.4 and 0.9 × 10 19 m −3 were achieved. In the first instance, it is noted that ion temperature profiles tend to be flat across the accessible plasma radius, whilst a transition in the poloidal velocity from the ion to the electron diamagnetic direction is observed with increasing density. At the same time, the shear point for impurity velocity is seen to propagate outwards towards the plasma edge. Similarly, at a fixed density, a similar tendency is observed when raising the injected heating power. These results together with the behaviour of the impurity temperatures for the same conditions, suggest that collision frequency ν b/e E ∼ n e T −3/2 e can be considered as an important controlparameter of plasma dynamics.

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“…These include 32 toroidal field (TF) coils whose centres follow a toroidal helix of major radius and heated using two gyrotrons operated at 53.2 GHz, the 2 nd harmonic of the electron cyclotron resonance frequency (P ECRH ≤600 kW, t discharge ≤300 ms), central electron densities, n e (0), and temperatures, T e (0), up to 1.7 × 10 19 m -3 and 1 keV, respectively have been achieved. Additional heating by the injection of accelerated neutral hydrogen atoms (≤35 keV) from two tangential NBI's is available [10]. At present, each NBI provides up to 500 kW of additional heating (t NBI ≤100 ms) and, as a result, plasmas with n e (0) ≤5 × 10 19 m -3 have been attained with a lithium coating on the vacuum vessel wall [20].…”

Section: Methodsmentioning

confidence: 99%

“…In the TJ-II stellarator device, additional plasma heating using two neutral beam injection (NBI) systems is available [10]. When such heating is employed, broad spectral line like structures are observed to straddle intense oxygen ion emission lines collected by a vacuum ultraviolet (VUV) spectrometer whose line-of-sight does not cross either neutral beam.…”

Section: Introductionmentioning

confidence: 99%