High power target measurements and finite element calculations for ISL targets

High intensity targets for ISOL, historical and practical perspectives

“…The target cooling approaches considered (and their major proponents) during this period included The results of the He-cooled target studies were published by Maddi et al [21]. While this approach may provide suitable cooling, it is far from simple and may not be practical considering the costs of producing intricately machined targets that ultimately become disposable at the end of an irradiation.…”

“…2 shows 75 lA yields for surface ionized [8][9][10][11] Li, [20][21][22][23][24][25][26][27] Na and 26,[28][29][30][31] Al measured on the last day of the target run as a ratio of the same nuclide yields measured 17 days earlier; the yield ratios are plotted as a function of the nuclide half life. Over the last 17 days of target life, the yields dropped an average 79% (the two high lying points corresponding to 20,21 Na are believed to be spurious due to incorrect mass separator settings during the first series of measurements). Since Li, Na and Al yields are affected equally, the yield decrease cannot be assigned to ion source poisoning.…”

“…2. Yield ratios of[8][9][10][11] Li,[20][21][22][23][24][25][26][27] Na and 26,28-31 Al measured 17 day apart. The average $79% yields decrease is believed to result from loss of target container integrity.…”