DOI: 10.1002/2014GL061820
论文题名: Observation of collisionless shocks in a large current-free laboratory plasma
作者: Niemann C. ; Gekelman W. ; Constantin C.G. ; Everson E.T. ; Schaeffer D.B. ; Bondarenko A.S. ; Clark S.E. ; Winske D. ; Vincena S. ; Van Compernolle B. ; Pribyl P.
刊名: Geophysical Research Letters
ISSN: 0094-9627
EISSN: 1944-9358
出版年: 2014
卷: 41, 期: 21 起始页码: 7413
结束页码: 7418
语种: 英语
英文关键词: collisionless shock
; laboratory astrophysics
; planetary bow shock
Scopus关键词: Astrophysics
; Debris
; High energy lasers
; Ions
; Laboratories
; Laser produced plasmas
; Magnetoplasma
; Pistons
; Plasma interactions
; Shock waves
; Bow shocks
; Collisionless shocks
; Computational work
; High-energy laser systems
; Laboratory astrophysics
; Laser plasma plumes
; Magnetized plasmas
; Magnetosonic shocks
; Collisionless plasmas
; ion
; laser method
; magnetization
; plasma
; shock wave
; simulation
英文摘要: We report the first measurements of the formation and structure of a magnetized collisionless shock by a laser-driven magnetic piston in a current-free laboratory plasma. This new class of experiments combines a high-energy laser system and a large magnetized plasma to transfer energy from a laser plasma plume to the ambient ions through collisionless coupling, until a self-sustained MA ∼ 2 magnetosonic shock separates from the piston. The ambient plasma is highly magnetized, current free, and large enough (17 m × 0.6 m) to support Alfvén waves. Magnetic field measurements of the structure and evolution of the shock are consistent with two-dimensional hybrid simulations, which show Larmor coupling between the debris and ambient ions and the presence of reflected ions, which provide the dissipation. The measured shock formation time confirms predictions from computational work. Key Points First laboratory observation of collisionless shocks of cosmic relevanceFirst measurement of shock formation timeMeasured upper bound of debris-ambient coupling criterion ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84912094061&doi=10.1002%2f2014GL061820&partnerID=40&md5=767f4accf2a1949da8f9a0ad0c6e6503
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6891
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Physics and Astronomy, University of California, Los Angeles, CA, United States
Recommended Citation:
Niemann C.,Gekelman W.,Constantin C.G.,et al. Observation of collisionless shocks in a large current-free laboratory plasma[J]. Geophysical Research Letters,2014-01-01,41(21).