On the very high energy confinement observed in super H-mode DIII-D experiments

Ding, S.; Garofalo, A. M.; Knolker, M.; Marinoni, A.; McClenaghan, J.; Grierson, B. A.

doi:10.7910/DVN/WL9NAZ

Title: On the very high energy confinement observed in super H-mode DIII-D experiments

Abstract

Analysis of recent super H-mode experiments on DIII-D shows that high rotation, not high pedestal, plays the essential role in achieving very high conﬁnement H98y2 > 1.5. Very high conﬁnement is reached early on in the H-mode phase of these discharges, when the pedestal is still very low, but after the toroidal rotation has already built-up to very high levels in the core. As the discharge evolves, the rotation drops, and so does the energy conﬁnement, despite a sustained very high pressure pedestal. During this evolution, the conﬁnement quality is linearly correlated with the core toroidal rotation, which varies according to diﬀerent levels of injected neutral beam torque per particle. Core transport modeling shows that the contribution from rotation in the E×B shear is responsible for conﬁnement quality signiﬁcantly in excess of standard H-mode (H98y2 ∼ 1).

Authors:: Ding, S.; Garofalo, A. M.; Knolker, M.; Marinoni, A.; McClenaghan, J.; Grierson, B. A.

Publication Date:: 2021-05-05

DOE Contract Number:: SC0010685; FC02-04ER54698

Research Org.:: General Atomics, San Diego, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1882410

DOI:: https://doi.org/10.7910/DVN/WL9NAZ

Citation Formats


                    Ding, S., Garofalo, A. M., Knolker, M., Marinoni, A., McClenaghan, J., and Grierson, B. A. On the very high energy confinement observed in super H-mode DIII-D experiments.  United States: N. p., 2021. 
        Web.  doi:10.7910/DVN/WL9NAZ.

Copy to clipboard


                    Ding, S., Garofalo, A. M., Knolker, M., Marinoni, A., McClenaghan, J., & Grierson, B. A. On the very high energy confinement observed in super H-mode DIII-D experiments.  United States.  doi:https://doi.org/10.7910/DVN/WL9NAZ

Copy to clipboard


                    Ding, S., Garofalo, A. M., Knolker, M., Marinoni, A., McClenaghan, J., and Grierson, B. A. 2021.  
"On the very high energy confinement observed in super H-mode DIII-D experiments".  United States.  doi:https://doi.org/10.7910/DVN/WL9NAZ.  https://www.osti.gov/servlets/purl/1882410. Pub date:Wed May 05 00:00:00 EDT 2021

Copy to clipboard


                    
@article{osti_1882410,

  title        = {On the very high energy confinement observed in super H-mode DIII-D experiments},

  author       = {Ding, S. and Garofalo, A. M. and Knolker, M. and Marinoni, A. and McClenaghan, J. and Grierson, B. A.},

  abstractNote = {Analysis of recent super H-mode experiments on DIII-D shows that high rotation, not high pedestal, plays the essential role in achieving very high conﬁnement H98y2 > 1.5. Very high conﬁnement is reached early on in the H-mode phase of these discharges, when the pedestal is still very low, but after the toroidal rotation has already built-up to very high levels in the core. As the discharge evolves, the rotation drops, and so does the energy conﬁnement, despite a sustained very high pressure pedestal. During this evolution, the conﬁnement quality is linearly correlated with the core toroidal rotation, which varies according to diﬀerent levels of injected neutral beam torque per particle. Core transport modeling shows that the contribution from rotation in the E×B shear is responsible for conﬁnement quality signiﬁcantly in excess of standard H-mode (H98y2 ∼ 1).},

  doi          = {10.7910/DVN/WL9NAZ},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2021},

  month        = {5}

}

Copy to clipboard

Dataset:

View Dataset

DOI: https://doi.org/10.7910/DVN/WL9NAZ

Save / Share:

Export Metadata

Save to My Library

Works referencing / citing this record: