[en] For nuclear structure experiments with heavy ions it is necessary to have ion energies in excess of 5 MeV per nucleon. At the Argonne tandem FN accelerator this was accomplished by the addition of a superconducting linac. Modifications of the FN tandem to improve the performance of the pair is described

No abstract available

[en] In an effort to produce a coherent picture of foil lifetimes, a review is given of results of various authors on the use of carbon foil beam strippers for heavy ion facilities. Foil heating in the tandem terminal during heavy ion bombardment, combined with oscillation of the foil, should produce acceptable foil lifetimes and improve the beam quality by reduction of the foil thickening effect and the accompanying inhomogeneity. The installation and operation of such a system does not present insurmountable problems

No abstract available

No abstract available

[en] A surface ionization model with three body interaction is used to explain the mass spectra of negative ions from Cs sputter sources as well as their time dependence. The importance of the high diffusion rate from radiation damaged volumes is illustrated and the difficulties these may cause in quantitative mass spectroscopy with Cs sputter sources are discussed. The anomalously large emittance of single negative ions compared to clusters is ascribed to the surface formation and breakup of negative dimers. An example of negative molecule formation which does not proceed by a surface reaction is given. 16 refs., 2 figs., 1 tab

[en] The emittance of the inverted sputter source with immersion lenses was measured to be about 5π mm mrad MeV¹2/ at the 75% level over a wide range of beam intensities. The use of the source in experiments with radioactive sputter targets and hydrogen loaded targets is described. Self contamination of the source is discussed

[en] A discussion is given of the advantages and disadvantages of thin carbon foil strippers for heavy ion beams from tandem electrostatic accelerators. Foil lifetimes were increased by radiative heating and by the evaporation of a thin layer of gold on the foil

[en] The lifetime of carbon foils used as strippers in terminals of tandem electrostatic accelerators or as strippers prior to injection into post accelerators increases with increasing ion velocity. The usefulness of such strippers is affected by foil thickening processes due to hydrocarbon cracking and radiation induced effects as well as by pronounced increases in energy straggling from non-uniformity. The lifetime of the foils is substantially increased if the foil is heated during exposure to temperatures of about 400⁰C

[en] The program of the tandem-linac accelerator system is summarized under the following headings: operating experience for the tandem, operation of the superconducting linac, upgrading of the tandem (ion sources, vacuum systems, terminal box, stripping foils, beam bunching), installation of the booster, planned accelerator system improvements, experimental facilities development at the super conducting-linac booster (new beam line, layout and installation of the 0⁰ beam line in the new experiment area, beam optics calculations, 65-in. scattering chamber, split-pole spectrograph, sum/multiplicity detector, nuclear target making and development), and university use of the tandem accelerator