Charge-exchange reactions of H+, H2+ and H3+ at energies of 1–30 keV in sodium vapor were studied using the charge-exchange canal of a 2 × 1 MV tandem accelerator. Ion optics simulations were ...performed before measurements to ensure high beam transport efficiency in the beamline. The density of sodium vapor was calibrated with published attenuation cross-section data of He+-Na. Total attenuation cross sections of all the three species were acquired, among which, the data for H+ agree well with the existing data and those for H2+, H3+ were first measured. In the relatively high energy range (above 3 keV/amu), the total attenuation cross-sections appear to be independent of incident ion species; however, the curves for different ion species show different tendencies in the low energy part. Besides, the yields of negative ions were also obtained. It appears that H+ is most efficient to produce H− compared with H2+ and H3+.
A 6 MV tandem accelerator at the University of Tsukuba, Japan, has been working on multi-nuclide (10Be, 14C, 26Al, 36Cl, 41Ca, and 129I) accelerator mass spectrometry (AMS) since 2016. This paper ...reports improvement of isobar suppression techniques for 36Cl AMS. Previous studies have shown that a Cu sample holder with AgBr backing is the most suitable for 36Cl AMS to decrease isobaric 36S interference. Therefore, the method of AgBr preparation was considered, and we found that preparation under acidic conditions was most appropriate to reduce 36S in 36Cl AMS. Cl charge states and their analysis method were considered to improve peak separation. 36Cl8+ was chosen for detection because it allows clear separation of 36S from the 36Cl spectrum. Furthermore, 36S spectrum tails could be removed using a third anode (dE3) signal. As a result, a 36Cl/Cl background of ∼3×10-15 was achieved.
The Tandem as a Heavy Ion Accelerator Rose, P. H.; Purser, K. H.; Wittkower, A. B.
IEEE transactions on nuclear science,
06/1965, Letnik:
12, Številka:
3
Journal Article
Recenzirano
Tables of the estimated energies obtainable with three types of tandem accelerator are presented and together with a brief discussion of the problems of heavy ion generation and acceleration.
The electrostatic and electromagnetic straight-line accelerators originated by Robert Van de Graaff for nuclear science have, for very heavy ions, moved toward the GeV level through advances in high ...voltage technology applied to the multi-stage (tandem) acceleration of multistripped ions. An account is given of the discreet steps in this exponential progress which depends basically on the maximum reliable voltage of one or a series of terminals. Recent studies on compressed gas insulation and on the control of electrical processes within long high-gradient acceleration tubes are described. These indicate the possibility of further substantial increases in terminal and column gradients applicable later to existing accelerators and to enlarged goals for new ones.
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