S (a) 1.V.Kurchatov Inmtitute, Momcow, USSR ( b ) Central Inmtitute of Electrun Phymicm, Academy of S c i m c e m o f the GDR, Berlin 1. Introduction It im u e l l known that in the edge plamaa of tokarakm m t r o n g d m m i t y and potential fluctuations exist which can lead to a n o m a l w s tranmport p h m o r e n a /I/. There are mreamonm to suppome that the level o f theme fluctuationm im c o n n u t e d with neutral particle fluxes penetrating into the plamaa due to gampufting or recycling procesmem. The dimmipative drift d e i m one o f the momt important rodem in the collimion dominated ed9r plamma /2-41. We investigate the influence o f neutral particlcm on the bchavioClr o f theme nodem. We s h o w that their mtability criteria may br changed mignificantly by taking into conmidrration the ionization o f the n wtral particle. and charge-exchange proccmmes. It i m knoun that in the abmence o f neutralm the ragnetic m h e a r mtabilirem the dimmipative drift modem in the mlab approximation /3/. Our calculationm m h o u that theme modem may become unstable owing to ionization procermem if the concentration o f the neutral particlrm e x c w d m m o m s critical value, wheream the charge-exchange doem not affect the mtability. In the toroidal geometry theme nodem conserve their main proprtiem, but the value of the critical neutral denmity i m mlightly m o d i f i d . On the other hand, mome unmtable molutionm of the eigenvalucequation f o r the drift waves exist in the a b m m c e of neutral prrticlem, which arc connected with the mtrong toroidal rode coupling. They dirmappear in the plamma mlab limit / 4 / . The incr-t o f t h s e nodes is modified significantly both by ionization and charge-exchange. The i'onization of the neutral particles leads always to an increasing of the increment. The influence of charge-exchange procesmem on the time b e h a v i w r of the drift waves dependm on their frequcnciem. A C o n t r i b . Plasma Phys. 30 (1990)1. 31-35 /1/ P.C.Li-r, Nuc1.Fusion 23 (1985) 543 /2/ B.B.Kadoatsev, 0.P.Pogutse. "Voprosy teorii plasma-, vyp. 3 Atomizdat,'Moscou 1971
Physical bases of conductivity of strongly ionized airАннотация. Исследован процесс возбуждения электропроводности воздуха импульсным пучком релятивистских электронов. Показано, что электропроводность воздуха при нормальном давлении определяется поведением электронной компоненты, которая с временным разрешением порядка 10 -8 с повторяет изменения электронного потока. Рассмотрена возможность абсолютных измерений мощности экспозиционной дозы в широком диапазоне интенсивности излучения.Abstract. The excitement of air conductivity by a pulse bunch of relativistic electrons has been studied in the work. It has been shown that conductivity of air at normal pressure is defined by behavior of electronic components which with time permission of the order 10 -8 s repeats changes of an electronic stream. The possibility of absolute measurements of exposition dose power in the wide range of radiation intensity has been considered.Ключевые слова: воздух, ионизация, электропроводность.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.