ABSTRACT. Adiabatic toroidal compression experiments were performed in conjunction with high power neutral beam injection in the Tokamak Fusion Test Reactor (TFTR). Acceleration of beam ions to energies nearly twice the injection energy was measured with a charge exchange neutral particle analyser. Measurements were also made of 2.5 MeV neutrons and 15 MeV protons produced in fusion reactions between the deuterium beam ions and the thermal deuterium and 3 He ions, respectively. When the plasma was compressed, the d (d,n) 3 He fusion reaction rate increased by a factor of five, and the 3 He(d,p)a rate by a factor of twenty. These data were simulated with a bounce averaged Fokker-Planck program, which assumed conservation of angular momentum and magnetic moment during compression. The results indicate that the beam ion acceleration was consistent with adiabatic scaling.

NOTICEThis report was prepared as an accountof work sponsoredby an agency of the United Stat._sGovernment. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibilityfor the accuracy, completeness, or usefulness of any information,apparatus, product,or processdisclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial produce, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarilyconstitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Neutral Particle Measurements and other DiagnosticsTwo vertically-viewing, mass-resolved, charge-exchange neutral Prior to neutral beam injection, the time-= averaged noise ratios, Sn(E), were determined by Sn(E)=F(E,t)/Fn(t) , where F(E,t) was the count rate including noise. During this period, no significant neutral particle flux was detected in the detector channels for energies above 25; keV. Under the assumption that Sn(E) is constant throughout a discharge, , the noise-corrected neutral flux during beam injection was evaluated by Experimental ResultsFnc(E,t) = F(E,t) -Sn(E)Fn(t) and the error was defined as Sn(E)Fn(t)/I Fnc(E,t) I. In