Observations Concerning the Injection of a Lithium Aerosol into the Edge of TFTR Discharges

Mansfield, D.K. ; Johnson, D.W. ; Grek, B. ; Kugel, H. ; Bell, M.G. ; al, et

Princeton University. Plasma Physics Laboratory.

关键词: Aerosols;    70 Plasma Physics And Fusion Technology;    Tftr Tokamak;    Inductance;    Neutrons;   

DOI  :  10.2172/769316
RP-ID  :  PPPL-3526
RP-ID  :  AC02-76CH03073
RP-ID  :  769316

美国|英语

来源: UNT Digital Library

【 摘 要 】

A new method of actively modifying the plasma-wall interaction was tested on the Tokamak Fusion Test Reactor. A laser was used to introduce a directed lithium aerosol into the discharge scrape-off layer. The lithium introduced in this fashion ablated and migrated preferentially to the limiter contact points. This allowed the plasma-wall interaction to be influenced in situ and in real time by external means. Significant improvement in energy confinement and fusion neutron production rate as well as a reduction in the plasma Zeff have been documented in a neutral-beam-heated plasma. The introduction of a metallic aerosol into the plasma edge increased the internal inductance of the plasma column and also resulted in prompt heating of core electrons in Ohmic plasmas. Preliminary evidence also suggests that the introduction of an aerosol leads to both edge poloidal velocity shear and edge electric field shear.