Changes in core electron temperature fluctuations across the ohmic energy confinement transition in Alcator C-Mod plasmas

Cited 25 time in webofscience Cited 0 time in scopus
  • Hit : 50
  • Download : 0
The first measurements of long wavelength (k(y)rho(s) < 0.3) electron temperature fluctuations in Alcator C-Mod made with a new correlation electron cyclotron emission diagnostic support a long-standing hypothesis regarding the confinement transition from linear ohmic confinement (LOC) to saturated ohmic confinement (SOC). Electron temperature fluctuations decrease significantly (similar to 40%) crossing from LOC to SOC, consistent with a change from trapped electron mode (TEM) turbulence domination to ion temperature gradient (ITG) turbulence as the density is increased. Linear stability analysis performed with the GYRO code (Candy and Waltz 2003 J. Comput. Phys. 186 545) shows that TEMs are dominant for long wavelength turbulence in the LOC regime and ITG modes are dominant in the SOC regime at the radial location (rho similar to 0.8) where the changes in electron temperature fluctuations are measured. In contrast, deeper in the core (rho < 0.8), linear stability analysis indicates that ITG modes remain dominant across the LOC/SOC transition. This radial variation suggests that the robust global changes in confinement of energy and momentum occurring across the LOC/SOC transition are correlated to local changes in the dominant turbulent mode near the edge.
Publisher
IOP PUBLISHING LTD
Issue Date
2013-08
Language
English
Article Type
Article
Citation

NUCLEAR FUSION, v.53, no.8

ISSN
0029-5515
DOI
10.1088/0029-5515/53/8/083010
URI
http://hdl.handle.net/10203/272857
Appears in Collection
NE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 25 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0