scholarly journals Anisotropic distribution function of minority tail ions generated by strong ion-cyclotron resonance heating

1989 ◽  
Author(s):  
C.S. Chang ◽  
P. Colestock
Keyword(s):  
Distribution Function ◽  
Cyclotron Resonance ◽  
Ion Cyclotron Resonance ◽  
Ion Cyclotron

Collisionless evolution of ion distributions in the presence of ion cyclotron resonance heating

1986 ◽  
Vol 36 (3) ◽  
pp. 357-370 ◽  
Author(s):  
D. Anderson ◽  
L.-G. Eriksson ◽  
M. Lisak
Keyword(s):  
Distribution Function ◽  
Analytical Solutions ◽  
Cyclotron Resonance ◽  
Time Development ◽  
Wave Power ◽  
Ion Cyclotron Resonance ◽  
Particle Trapping ◽  
Ion Distributions ◽  
Beam Heating ◽  
Ion Cyclotron

Explicit analytical solutions are given for the collisionless time evolution of the distribution function for ions absorbing RF wave power through ion cyclotron resonance heating in a tokamak. Two different scenarios are considered: (i) conventional ICRH and (ii) combined neutral beam heating and ICRH with the RF wave frequency tuned to the ion cyclotron resonance frequency of the injected ions. Finally, the effect of particle trapping on the time development of the distribution function is also analysed.

Ion Cyclotron Resonance Collision Frequencies of Alkali Ions in Rare Gases

1974 ◽  
Vol 52 (17) ◽  
pp. 1683-1693 ◽  
Author(s):  
M. Riggin
Keyword(s):  
Distribution Function ◽  
Energy Distribution ◽  
Cyclotron Resonance ◽  
Particle Density ◽  
Energy Distribution Function ◽  
Ion Cyclotron Resonance ◽  
Zero Field ◽  
Ion Cyclotron ◽  
Oscillating Electric Field ◽  
Ionic Energy

An ion cyclotron resonance (ICR) spectrometer was used to estimate collision frequencies of K+ and Na+ ions at near thermal velocities in helium and argon gases. The reduced zero field d.c. drift mobilities were found to be 11.4 and 40.7 cm2 PMU1/2/V s for 39K+ in Ar and He respectively and 11.6 and 42.8 cm2 PMU1/2/V s for Na+ in these gases. The effect of ion-neutral collisions on the energy distribution function for ions at resonance with an oscillating electric field is discussed and the average ionic energy as a function of neutral particle density obtained. In deriving the ICR line shape and ionic energy distribution function it is assumed that the mean time between momentum changing collisions is independent of the relative ion–neutral velocity.

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