Characteristics of ELM activity and fueling efficiency of pellet injection from different locations on DIII-D

Baylor, L. R.; Jernigan, T. C.; Colchin, R.J.; Ferron, J. R.; Wade, M. R.

doi:10.1016/s0022-3115(00)00487-6

Cited by 19 publications

(24 citation statements)

References 9 publications

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“…Efficiencies of up to $10% were observed with the higher gas flow rates attempted. The pellet fueling efficiency was similar to previous reported results in Hmode plasmas [3] with the V + 3 injection line leading to relatively low efficiency due to the edge localized perturbation and ExB drift effect hypothesized to eject mass out of the plasma [8].…”

Section: Fueling Profiles and Efficiencysupporting

confidence: 86%

“…The gas fueling efficiency in these experiments defined as the percentage of fuel introduced that is retained in the core plasma after the gas puff is completed is fairly low but higher than in other ELMing H-mode experiments [3]. Efficiencies of up to $10% were observed with the higher gas flow rates attempted.…”

Section: Fueling Profiles and Efficiencymentioning

confidence: 62%

“…Curved guide tubes have been installed to connect the three barrels of the injector to vertical ports (V + 1 and V + 3) and to two inner wall locations (HFS 45 and HFS mid) as shown in Ref. [3]. Gas fueling in these experiments was provided from the GASA port, which is located in an upper port above the outside midplane also shown in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Gas fueling in these experiments was provided from the GASA port, which is located in an upper port above the outside midplane also shown in Ref. [3].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fueling of QH-mode plasmas on DIII-D with pellets and gas

Baylor

Jernigan

Burrell

et al. 2005

Journal of Nuclear Materials

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Section: Fueling Profiles and Efficiencysupporting

confidence: 86%

Section: Fueling Profiles and Efficiencymentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

“…Gas fueling in these experiments was provided from the GASA port, which is located in an upper port above the outside midplane also shown in Ref. [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fueling of QH-mode plasmas on DIII-D with pellets and gas

Baylor

Jernigan

Burrell

et al. 2005

Journal of Nuclear Materials

Self Cite

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“…In ASDEX Upgrade, a fully controlled scenario with favorable divertor conditions has been achieved by maintaining a constant ELM frequency enforced by injection of small pellets [24]. Pellet injection is known to trigger ELMs and thus is being considered as a desirable technique for external control of the ELM frequency [25][26][27][28][29]. It is certainly clear that injected pellets reduce ∆W ELM when the pellet repetition frequency f pellet exceeds the spontaneous ELM frequency.…”

Section: The Role Of the Pedestal Structure In Elm Energy Lossmentioning

confidence: 99%

Pedestal Characteristics of H-Mode Plasmas in JT-60U and ASDEX Upgrade

Urano¹,

Kamada²,

Takizuka³

et al. 2005

J. Plasma Fusion Res.

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The role of the pedestal structure in ELMy H-mode plasmas for the core energy confinement and for the ELM energy losses were investigated in two tokamak-type devices, JT-60U and ASDEX Upgrade. The confinement degradation seen at higher densities is attributed to the reduction of the pedestal temperature limited by the ELM activities and the stiffness of the temperature profiles. In high triangularity or impurity seeded H-modes, in which higher energy confinement is generally achieved, a higher pedestal temperature is obtained by improving the edge MHD stability or the density profile peaking, respectively. The upper bound of the ELM energy loss is characterized by the pedestal energy. The ELM energy loss can become smaller at fixed pedestal energy when the pedestal collisionality is raised. Raising the pedestal collisionality also enhances the inter-ELM perpendicular transport loss and reduces the ELM loss power fraction. In ASDEX Upgrade, the continuous pellet injection is shown to effectively mitigate ELM losses while preserving the core confinement quality. In JT-60U, the operation regime of grassy ELM is investigated and shown to achieve highly integrated performance of high energy confinement with small ELMs in the low collisionality regime.

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