Compact IH-APF type linac for PIXE and RBS analyses

We studied an IH-APF type Linac for PIXE and RES analyses use. The compact (L = 1.5 m) linac accelerates protons from 40 keV to 2.0 MeV. This alternat ing-phase-focus (APF) system cannot focus such a high intense beam, but a b eam of several 100 mu A is focused by the combination of Focus-Defocus sequ ence. For PIXE and RBS analyses, intensity of bombard particles is several mu A lower than several 100 mu A. From particle orbit calculation, on energ y width of +/-0.2%, this linac can accept transverse emittance of 113 pi mm mrad. longitudinal phase of 35 degrees (by using two bunchers, beam transm ission gets larger than 80%) and beam intensity of several 100 mu A The lin ac can accelerate protons to 2.0 MeV by RF power of about 10 kW. We designe d the interdigital H (1H) linear accelerator by particle-orbit calculation. All PIXE and RES analyses systems occupy only 2 m x 3 m. A half-model cavi ty was designed. The model is being manufactured now for measurement of RF characteristics. (C) 2000 Elsevier Science B.V. All. rights reserved.