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  Overview of recent Alcator C-Mod research

Marmar, E. S., Bail, B., Boivin, R. L., Bonoli, P. T., Boswell, C., Bravenec, R., et al. (2003). Overview of recent Alcator C-Mod research. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

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Marmar, E. S.1, Author
Bail, B.1, Author
Boivin, R. L.1, Author
Bonoli, P. T.1, Author
Boswell, C.1, Author
Bravenec, R.1, Author
Carreras, B.1, Author
Ernst, D.1, Author
Fiore, C.1, Author
Gangadhara, S.1, Author
Gentle, K.1, Author
Goetz, J.1, Author
Granetz, R.1, Author
Greenwald, M.1, Author
Hallatschek, K.2, 3, Author           
Hastie, J.1, Author
Hosea, J.1, Author
Hubbard, A.1, Author
Hughes, J. W.1, Author
Hutchinson, I.1, Author
In, Y.1, AuthorIrby, J.1, AuthorJennigs, T.1, AuthorKopon, D.1, AuthorKramer, G.1, AuthorLaBombard, B.1, AuthorLee, W. D.1, AuthorLin, Y.1, AuthorLipschultz, B.1, AuthorLiptac, J.1, AuthorLynn, A.1, AuthorMarr, K.1, AuthorMaqueda, R.1, AuthorMelby, E.1, AuthorMikkelsen, D.1, AuthorMossessian, D.1, AuthorNazikian, R.1, AuthorNevins, W. M.1, AuthorParker, R.1, AuthorPedersen, T. S.4, Author           Phillips, C. K.1, AuthorPhillips, P.1, AuthorPitcher, C. S.4, Author           Porkolab, M.1, AuthorRamos, J.1, AuthorRedi, M.1, AuthorRice, J.1, AuthorRogers, B. N.1, AuthorRowan, W. L.1, AuthorSampsell, M.1, AuthorSchilling, G.4, Author           Snipes, J.1, AuthorSnyder, P.1, AuthorStotler, D.1, AuthorTaylor, G.1, AuthorTerry, J. L.1, AuthorWilson, H.1, AuthorWilson, J. R.1, AuthorWolfe, S. M.1, AuthorWukitch, S.1, AuthorXu, X. Q.1, AuthorYoungblood, B.1, AuthorYuh, H.1, AuthorZhurovich, K.1, AuthorZweben, S.1, Author more..
1Massachusetts Institute of Technology, Cambridge, MA, USA; Princeton Plasma Physics Laboratory, Princeton, NJ, USA; University Texas, Austin, TX, USA; General Atomics, San Diego, CA, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA; University of Wisconsin, Madison, WI, USA; Los Alamos National Laboratory, Los Alamos, NM, USA; CRPP, Lausanne, Switzerland; Columbia University, New York, NY, USA; Institute for Aerospace Studies, University of Toronto, Toronto, Ontario, Canada; University of Idaho, Moscow, ID, USA; Lawrence Livermore National Laboratory, Livermore, CA, USA; Dartmouth University, Hanover, NH, USA; EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, UK; Cornell University, Ithaca, NY, USA, ou_persistent22              
2Centre for Interdisciplinary Plasma Science (CIPS), Max Planck Institute for Plasma Physics, Max Planck Society, ou_2074325              
3Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
4External Organizations, ou_persistent22              


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 Abstract: Research on the Alcator C-Mod tokamak [1] is focused on high particle- and power-density plasma regimes to understand particle and energy transport in the core, the
dynamics of the H-mode pedestal, and scrape-off layer and divertor physics. The auxiliary heating is provided exclusively by RF waves, and both the physics and technology of RF
heating and current drive are studied. The momentum which is manifested in strong toroidal rotation, in the absence of direct momentum input, has been shown to be transported in
from the edge of the plasma following the L–H transition, with timescale comparable to that for energy transport. In discharges which develop internal transport barriers, the
rotation slows first inside the barrier region, and then subsequently outside of the barrier foot. Heat pulse propagation studies using sawteeth indicate a very narrow region of
strongly reduced energy transport, located near r/a = 0.5. Addition of on-axis ICRF heating arrests the buildup of density and impurities, leading to quasi-steady conditions. The
quasi-coherent mode associated with enhanced D-Alpha (EDA) H-mode appears to be due to a resistive ballooning instability. As the pedestal pressure gradient and temperature
are increased in EDA H-mode, small ELMs appear; detailed modelling indicates that these are due to intermediate n peeling–ballooning modes. Phase contrast imaging has been
used to directly detect density fluctuations driven by ICRF waves in the core of the plasma, and mode conversion to an intermediate wavelength ion cyclotron wave has been
observed for the first time. The bursty turbulent density fluctuations, observed to drive rapid cross-field particle transport in the edge plasma, appear to play a key role in the
dynamics of the density limit. Preparations for quasi-steady-state advanced tokamak studies with lower hybrid current drive are well underway, and time dependent modelling
indicates that regimes with high bootstrap fraction can be produced.


Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Internal
 Degree: -


Title: 19th Fusion Energy Conference
Place of Event: Lyon (FR)
Start-/End Date: 2002-10-14 - 2002-10-19

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Title: Fusion Energy 2002
Source Genre: Proceedings
Publ. Info: Vienna : International Atomic Energy Agency
Pages: CD-ROM Volume / Issue: - Sequence Number: OV/4-1 Start / End Page: - Identifier: -