期刊
SCIENCE ADVANCES
卷 8, 期 10, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abj6799
关键词
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资金
- U.K. EPSRC [EP/R034737/1]
- European Research Council under the European Community [256973, 247039]
- U.S. DOE [B591485, DE-SC0016566, DE-NA0003605, DE-NA0003934, DE-NA0003868, DE-NA0001808, 89233118CNA000010, 89233119CNA000063, 536203, 630138, B632670, DE-NA0003856]
- University of Rochester
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- NSF [PHY-1619573, PHY-2033925]
- U.S. DOE ALCC program
- U.S. DOE ALCC
- LLE High Performance Computing group [2016R1A5A1013277, 2020R1A2C2102800]
- NRF of Korea
- AWE plc.
- NIF Discovery Science Program
- DOE NNSA-and DOE Office of Science-supported Flash Center for Computational Science at the University of Chicago
- U.S. Department of Energy (DOE) [DE-SC0016566] Funding Source: U.S. Department of Energy (DOE)
Conventional theories on heat transport fail in magnetized, turbulent, weakly collisional plasmas, leading to a significant suppression of heat transfer. By replicating such a system in a laser laboratory experiment, we observe large temperature variations on small spatial scales.
In conventional gases and plasmas, it is known that heat fluxes are proportional to temperature gradients, with collisions between particles mediating energy flow from hotter to colder regions and the coefficient of thermal conduction given by Spitzer's theory. However, this theory breaks down in magnetized, turbulent, weakly collisional plasmas, although modifications are difficult to predict from first principles due to the complex, multiscale nature of the problem. Understanding heat transport is important in astrophysical plasmas such as those in galaxy clusters, where observed temperature profiles are explicable only in the presence of a strong suppression of heat conduction compared to Spitzer's theory. To address this problem, we have created a replica of such a system in a laser laboratory experiment. Our data show a reduction of heat transport by two orders of magnitude or more, leading to large temperature variations on small spatial scales (as is seen in cluster plasmas).
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