Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas
文献类型：期刊论文
| 作者 | Jian, X.4; Holland, C.4; Candy, J.2; Belli, E.2; Chan, V.2; Garofalo, A. M.2; Ding, S.1,3 |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2019-11-26 |
| 卷号 | 123 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.123.225002 |
| 通讯作者 | Jian, X.(xijian@ucsd.edu) |
| 英文摘要 | We report on the first direct comparisons of microtearing turbulence simulations to experimental measurements in a representative high bootstrap current fraction (f(BS)) plasma. Previous studies of high f(BS) plasmas carried out in DIII-D with large radius internal transport barriers (ITBs) have found that, while the ion energy transport is accurately reproduced by neoclassical theory, the electron transport remains anomalous and not well described by existing quasilinear transport models. A key feature of these plasmas is the large value of the normalized pressure gradient, which is shown to completely stabilize conventional drift-wave and kinetic ballooning mode instabilities in the ITB, but destabilizes the microtearing mode. Nonlinear gyrokinetic simulations of the ITB region performed with the CGYRO code demonstrate that the microtearing modes are robustly unstable and capable of driving electron energy transport levels comparable to experimental levels for input parameters consistent with the experimental measurements. These simulations uniformly predict that the microtearing mode fluctuation and flux spectra extend to significantly shorter wavelengths than the range of linear instability, representing significantly different nonlinear dynamics and saturation mechanisms than conventional drift-wave turbulence, which is also consistent with the fundamental tearing nature of the instability. The predicted transport levels are found to be most sensitive to the magnetic shear, rather than the temperature gradients more typically identified as driving turbulent plasma transport. |
| WOS关键词 | ARBITRARY COLLISIONALITY ; KINETIC-THEORY ; TRANSPORT ; CONFINEMENT ; SIMULATIONS ; MODE |
| 资助项目 | U.S. Department of Energy[DE-SC0018287] ; U.S. Department of Energy[DE-SC0017992] ; U.S. Department of Energy[DE-FG02-95ER54309] ; U.S. Department of Energy[DE-FC02-04ER54698] ; National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility[DE-AC02-05CH11231] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | AMER PHYSICAL SOC |
| WOS记录号 | WOS:000499987900013 |
| 资助机构 | U.S. Department of Energy ; National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/105057]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Jian, X. |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China 2.Gen Atom, POB 85608, San Diego, CA 92186 USA 3.Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA 4.Univ Calif San Diego, La Jolla, CA 92093 USA |
| 推荐引用方式 GB/T 7714 | Jian, X.,Holland, C.,Candy, J.,et al. Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas[J]. PHYSICAL REVIEW LETTERS,2019,123. |
| APA | Jian, X..,Holland, C..,Candy, J..,Belli, E..,Chan, V..,...&Ding, S..(2019).Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas.PHYSICAL REVIEW LETTERS,123. |
| MLA | Jian, X.,et al."Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas".PHYSICAL REVIEW LETTERS 123(2019). |
入库方式： OAI收割
来源：合肥物质科学研究院
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