首页   按字顺浏览 期刊浏览 卷期浏览 Experimental study of the post‐implosion phase of a theta pinch
Experimental study of the post‐implosion phase of a theta pinch

 

作者: R. J. Commisso,   Hans R. Griem,  

 

期刊: Physics of Fluids(00319171)  (AIP Available online 1977)
卷期: Volume 20, issue 1  

页码: 44-50

 

ISSN:0031-9171

 

年代: 1977

 

DOI:10.1063/1.861694

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Using 90° Thomson scattering and magnetic probes, the time and space resolved electron temperature and density and magnetic field profiles were obtained for a small, 15 kJ theta pinch. At times after the implosion phase,t≳0.45–0.5 &mgr;sec, the plasma is characterized by a high &bgr;, 0.5≲&bgr;≲1.0,Te/Ti<1, andvE&Vthgr;≲vi(wherevE&Vthgr;is the E×B drift speed andviis the ion thermal speed). The current sheath width, &Dgr;Ls, and plasma resistivity in the sheath &eegr;eff, were obtained from the measured temperature, density, and field profiles at these late times. The results show that &Dgr;Ls≲ 3c/&ohgr;pi≫c/&ohgr;pe, &eegr;eff≈100 &eegr;⊥, and the effective collision frequency, &ngr;′eff, &ohgr;1h≲&ngr;′eff≪&ohgr;pi, where &eegr;⊥is the classical, Spitzer–Ha¨rm resistivity, and &ohgr;1his the lower hybrid frequency. These results indicate that plasma turbulence is an important factor when considering heating and transport, even in the low drift velocity regime. Theoretical estimates based on the lower‐hybrid‐drift instability are in reasonably good agreement with the measured resistivity and ion heating rate.

 

点击下载:  PDF (583KB)



返 回