Výsledky vyhledávání - "Walk Jr, John R."

Improved profile fitting and quantification of uncertainty in experimental measurements of impurity transport coefficients using Gaussian process regression

Autor: Chilenski, Mark Alan, Greenwald, Martin J., Marzouk, Youssef M., Howard, Nathaniel Thomas, White, Anne E., Rice, John E., Walk, John R., Jr., Walk Jr., John R.

Publikováno v: MIT web domain

The need to fit smooth temperature and density profiles to discrete observations is ubiquitous in plasma physics, but the prevailing techniques for this have many shortcomings that cast doubt on the statistical validity of the results. This issue is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7304fe6d72527f598b384b80291281ee
https://doi.org/10.1088/0029-5515/55/2/023012

Zobrazit plný text záznamu

High-field side scrape-off layer investigation: Plasma profiles and impurity screening behavior in near-double-null configurations

Autor: S.M. Wolfe, G.M. Wallace, D.G. Whyte, Robert Mumgaard, Dan Brunner, Jerry Hughes, Brian LaBombard, Adam Kuang, S.J. Wukitch, J.R. Walk, J.L. Terry, Yuxuan Lin, M. Chilenski, Matthew Reinke, Earl Marmar, Ian Faust

Publikováno v: Nuclear Materials and Energy, Vol 12, Iss, Pp 139-147 (2017)
Elsevier

New experiments on Alcator C-Mod reveal that the favorable impurity screening characteristics of the high-field side (HFS) scrape-off layer (SOL), previously reported for single null geometries, is retained in double null configurations, despite the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fdf16c8e4838efa5613b029983ff0ed7
https://doi.org/10.1016/j.nme.2016.10.006

Zobrazit plný text záznamu

Multi-device studies of pedestal physics and confinement in the I-mode regime

Publikováno v: Prof. Whyte via Chris Sherratt
Nuclear Fusion

This paper describes joint ITPA studies of the I-mode regime, which features an edge thermal barrier together with L-mode-like particle and impurity transport and no edge localized modes (ELMs). The regime has been demonstrated on the Alcator C-Mod,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ffadb26e32ed76a51f28a6e5ce63b83
https://orcid.org/0000-0003-1004-5782

Zobrazit plný text záznamu

Lower hybrid wave edge power loss quantification on the Alcator C-Mod tokamak

Autor: Dan Brunner, Jerry Hughes, Gregory Wallace, Adam Kuang, Ian Faust, E.M. Edlund, Amanda Hubbard, J.L. Terry, Dennis G. Whyte, Ronald R. Parker, Brian LaBombard, S. Shiraiwa, J.R. Walk, Matthew Reinke, Seung Gyou Baek

Publikováno v: Prof. Whyte via Chris Sherratt

For the first time, the power deposition of lower hybrid RF waves into the edge plasma of a diverted tokamak has been systematically quantified. Edge deposition represents a parasitic loss of power that can greatly impact the use and efficiency of Lo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1495b0a8f6507e3779b35df1cbab4a3b
http://hdl.handle.net/1721.1/108781

Zobrazit plný text záznamu

Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas

Publikováno v: Prof. Whyte via Chris Sherratt

Core impurity transport has been investigated for a variety of confinement regimes in Alcator C-Mod plasmas from x-ray emission following injection of medium and high Z materials. In ohmic L-mode discharges, impurity transport is anomalous (D[subscri

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::83a3f6c47d50822c80ff41b0320731b7
https://orcid.org/0000-0003-2951-9749

Zobrazit plný text záznamu

Poloidal asymmetries in edge transport barriers

Autor: Amanda Hubbard, Ian H. Hutchinson, C.S. Chang, Peter J. Catto, Alcator C-Mod Team, D.R. Ernst, Paul Ennever, Matt Landreman, D.G. Whyte, Robert Hager, Jerry Hughes, Randy Michael Churchill, Christian Theiler, Matthew Reinke, Bruce Lipschultz, J.R. Walk

Publikováno v: Prof. Whyte via Chris Sherratt
Physics of Plasmas

Measurements of impurities in Alcator C-Mod indicate that in the pedestal region, significant poloidal asymmetries can exist in the impurity density, ion temperature, and main ion density. In light of the observation that ion temperature and electros

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::067ad7144096b9b1e5b168ed7ece7836
http://hdl.handle.net/1721.1/108729

Zobrazit plný text záznamu

Edge-localized mode avoidance and pedestal structure in I-mode plasmas

Autor: Istvan Cziegler, Seung Gyou Baek, P.B. Snyder, Matthew Reinke, Arturo Dominguez, J. E. Rice, J.R. Walk, D. G. Whyte, Randy Michael Churchill, T.H. Osborne, Jerry Hughes, J.L. Terry, Anne White, A.E. Hubbard, Christian Theiler

Publikováno v: MIT web domain

I-mode is a high-performance tokamak regime characterized by the formation of a temperature pedestal and enhanced energy confinement, without an accompanying density pedestal or drop in particle and impurity transport. I-mode operation appears to hav

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23e47ef8e67357be2772efa0021ecfaf
https://orcid.org/0000-0003-2951-9749

Zobrazit plný text záznamu

The physics mechanisms of the weakly coherent mode in the Alcator C-Mod Tokamak

Autor: T. Y. Xia, D.G. Whyte, Z. X. Liu, T. Zhang, Amanda Hubbard, J.R. Walk, Jiuyuan Li, S. G. Baek, Xueqiao Xu, Christian Theiler, Theodore Golfinopoulos, Jerry Hughes, Xiang Gao

Publikováno v: MIT Web Domain

The weakly coherent mode (WCM) in I-mode has been studied by a six-field two-fluid model based on the Braginskii equations under the BOUT++ framework for the first time. The calculations indicate that a tokamak pedestal exhibiting a WCM is linearly u

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02364efd11427715cc62d7082dfccf62
https://doi.org/10.1063/1.4972088

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání