Výsledky vyhledávání - "Neal Crocker"

Multiscale Chirping Modes Driven by Thermal Ions in a Plasma with Reactor-Relevant Ion Temperature

Autor: Xiaodi Du, N. W. Eidietis, M. Knolker, Wen Wu, M. A. Van Zeeland, Yueqiang Liu, T. L. Rhodes, Max E Austin, Huiqian Wang, William Heidbrink, Antti Snicker, Xiang Jian, R. Hong, Neal Crocker, K. Särkimäki

Funding Information: The author (X. D. Du) would like to thank F. Zonca and L. Chen for fruitful discussions. This work was supported by the US DOE under DE-AC05-00OR22725, DE-FC02-04ER54698, DE-AC02-09CH11466, DE-SC0015878, and DE-SC0018287. Publish

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::17123b614a3f0d088e87cd0c337d53bd
https://aaltodoc.aalto.fi/handle/123456789/108910

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Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations

Autor: Sx. Tang, William Heidbrink, R.I. Pinsker, J. B. Lestz, Kathreen Thome, Elena Belova, Troy Carter, Neal Crocker, M. A. Van Zeeland

Publikováno v: Physical Review Letters. 126

Fast-ion driven Alfv\'en waves with frequency close to the ion cyclotron frequency ($f=0.58{f}_{ci}$) excited by energetic ions from a neutral beam are stabilized via a controlled energetic ion density ramp for the first time in a fusion research pla

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d99de312570ac169a74e1bb4e52e6b7
https://doi.org/10.1103/physrevlett.126.155001

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Analytic stability boundaries for compressional and global Alfvén eigenmodes driven by fast ions. II. Interaction via Landau resonance

Autor: Neal Crocker, J. B. Lestz, Elena Belova, S.X. Tang, N. N. Gorelenkov

Conditions for net fast ion drive are derived for beam-driven, co-propagating, sub-cyclotron compressional (CAE) and global (GAE) Alfv\'en eigenmodes driven by the Landau resonance with super-Alfv\'enic fast ions. Approximations applicable to realist

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cecdef86ebb90a8587819389156b1bb8

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New methodology for measuring electron density perturbations caused by plasma coherent modes using profile reflectometry: Magnitudes and radial profiles in DIII-D

Autor: Neal Crocker, W. A. Peebles, Lei Zeng, T. L. Rhodes

Publikováno v: Review of Scientific Instruments. 92:043550

New capabilities of fast-sweep frequency-modulated profile reflectometry are explored to measure electron density ne perturbation magnitudes and radial profiles due to plasma coherent modes in DIII-D. The first approach is based on the frequency anal

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12c2bd53c8073fa223bf2663edcd5a5b
https://doi.org/10.1063/5.0043121

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Analytic stability boundaries for compressional and global Alfvén eigenmodes driven by fast ions. I. Interaction via ordinary and anomalous cyclotron resonances

Autor: Neal Crocker, N. N. Gorelenkov, J. B. Lestz, S.X. Tang, Elena Belova

Publikováno v: Physics of Plasmas. 27:022513

Conditions for net fast ion drive are derived for beam-driven, sub-cyclotron compressional (CAE) and global (GAE) Alfv\'en eigenmodes, such as those routinely observed in spherical tokamaks such as NSTX(-U) and MAST. Both co- and counter-propagating

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f68f72a5cf59318aa6f59a66970ff8b
https://doi.org/10.1063/1.5127551

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First step toward a synthetic diagnostic for magnetic fluctuation measurements using cross-polarization scattering on DIII-D

Autor: G. Wang, Kshitish Barada, W. A. Peebles, Neal Crocker, T. L. Rhodes

Publikováno v: The Review of scientific instruments. 89(10)

Cross-polarization scattering (CPS) provides localized magnetic fluctuation (B) measurements in fusion plasmas based on the process where B scatters electromagnetic radiation into the orthogonal polarization. The CPS system on DIII-D utilizes the pro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bcd2c91bd5bdbe842259704db8cce994
https://pubmed.ncbi.nlm.nih.gov/30399840

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Evaluation of low-frequency operational limit of proposed ITER low-field-side reflectometer waveguide run including miter bends

Autor: C. Wannberg, G. R. Hanson, Cornwall Lau, E. J. Doyle, W. A. Peebles, G. Wang, J. L. Doane, Neal Crocker

Publikováno v: The Review of scientific instruments. 88(10)

The present design concept for the ITER low-field-side reflectometer transmission line (TL) consists of an ∼40 m long, 6.35 cm diameter helically corrugated waveguide (WG) together with ten 90° miter bends. This paper presents an evaluation of the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3425bf0097cada2c5db50992043f23e5
https://pubmed.ncbi.nlm.nih.gov/29092526

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