Zonal flow generation and its nonlinear dynamics in trapped electron mode turbulence of flat density tokamak plasmas
Nuclear Fusion, ISSN: 1741-4326, Vol: 56, Issue: 6
2016
- 12Citations
- 10Captures
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Article Description
We investigate zonal flow (ZF) generation in ion temperature gradient driven trapped-electron-mode (ITG-driven TEM) turbulence via modulational instability analysis. We show that the acceleration of a seed ZF is a consequence of the competition of negative radiation pressure (NRP, acting as a driving force) and positive radiation pressure (PRP, acting as a retarding force) of the ITG-driven TEM turbulence. A critical dimensionless ion temperature logarithmic gradient (R/L) normalized to the major radius is obtained by balancing the NRP- and PRP effects. For R/L < R/L, the NRP effect is dominant and the seed ZF is accelerated. Otherwise, the PRP effect is dominant and the seed ZF is decelerated. In addition, a new nonlinear evolution mechanism of the ZF is also proposed. It is shown that the turbulence energy intensity spectrum gets steepened in k-space due to the ZF shearing, which in turn induces nonlinear growth of the ZF.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84975840863&origin=inward; http://dx.doi.org/10.1088/0029-5515/56/6/066014; https://iopscience.iop.org/article/10.1088/0029-5515/56/6/066014; https://dx.doi.org/10.1088/0029-5515/56/6/066014; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=8eb9227b-a6e9-4d9e-909b-be9a579bb677&ssb=44162268357&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0029-5515%2F56%2F6%2F066014&ssi=f37c1599-8427-4e81-a197-3d16c6f6e706&ssk=support@shieldsquare.com&ssm=83236308805642724309856888202351147&ssn=ab1820b1db374102db464da457e0ed44e8b02f0fbc69-9e01-4767-948239&sso=0132c809-259ac1c821e11ec38ed454537df3a965546aff67ba652c04&ssp=93588624271721233225172139580769603&ssq=88621750666083884316336784226698436216099&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJfX3V6bWYiOiI3ZjYwMDBkOTY2YjBkNC1iNDc3LTQzMmYtYmU0My0xZTA0NjEwMTgxNzgxNzIxMjM2Nzg0NTAyNjk4NzYzNzMtNDQ3MWJlMDE4YTA2NTdiZDMwOTg1IiwicmQiOiJpb3Aub3JnIiwidXpteCI6IjdmOTAwMGM0YTkyODFhLTVmYzEtNGRmMy1iODc2LWI5NjdkODk1YjkyNTItMTcyMTIzNjc4NDUwMjY5ODc2MzczLWIyNzJjZTI2MWRiNGVkNDQzMDk4NSJ9
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