Doctoral Dissertations


"This thesis examines several atomic collisional processes involved in controlled thermonuclear fusion. Specifically, experimental studies have been made on the state- selective single capture reaction

3He2+ + He —> 3He+(n) + He+(n'), (1)

on the double capture reaction

3He2+ + H e—> 3He + He2+ , (2)

and on the single ionization of atomic targets X

Aq+ + X —> Aq+ + X+ + e- (3)

by charged projectiles Aq+. Reactions (1) and (2) have an importance in plasma energy balance and in plasma diagnostics for fusion reactors. The ionization reaction (3) plays a significant role in neutral beam heating and energy balance in fusion plasmas.

Total cross sections were measured for capture into final states of n=n'=1 and the sum of the states n=2, n'=1 and n=1, n'=2 for reaction (1) at projectile energies of 15, 30 and 45 keV/amu. Differential cross sections as a function of scattering angle for reaction (2) have been measured for a projectile energy of 60 keV/amu. The single ionization reaction (3) has been studied by examining ionization of the rare gases by protons and alpha particles. The experimental work led to the discovery of a new ionization mechanism and this mechanism has led to the derivation of scaling laws which play an important role in computational modeling of fusion plasmas"--Abstract, page iii.


Gay, Timothy J. (Timothy James), 1953-

Committee Member(s)

Olson, Ronald E.
Hale, Edward Boyd
Bell, Robert John, 1934-
Anderson, H. U. (Harlan U.)



Degree Name

Ph. D. in Physics


The author gratefully acknowledges funding for this project from the Department of Energy, Office of Fusion Energy.


University of Missouri--Rolla

Publication Date

Spring 1992


xi, 197 pages

Note about bibliography

Includes bibliographical references (pages 193-196).


© 1992 Victor Dewitt Irby, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 6403

Print OCLC #


Included in

Physics Commons