CALIBRATION OF DIRECT NUCLEAR ACTIVATION DIAGNOSTICS FOR MEASURING INTENSE PROTON, LITHIUM, AND FLUORINE BEAMS

In the light-ion-beam fusion program at Sandia National Laboratories a n intense Lithium beam is being developed to drive inertial confinemen t fusion targets. Since beam purity is an important issue, direct nucl ear activation diagnostics based on the thick target yields of the rea ctions Li-7(p,n) Be-7, B-10(p,alpha) Be-7, F-19(Li-7,d)Na-24 and B-11( F-19,2p) Mg-28 have been developed to measure the proton, lithium, and fluorine content of the beam. The specific target materials chosen fo r this work are LiF and BN. To calibrate these diagnostics, a Van de G raaff accelerator was used to measure the thick target yields as a fun ction of ion energy for each of the ion and target material combinatio ns. Each target material was also irradiated by carbon ions to assess the importance of any possible competing reactions. The results of the se calibration studies are presented. (C) 1997 American Institute of P hysics.