HVE has extended its range of AMS systems with a 1 MV as well as 5 MV version. The 1 MV version of this range is a compact system with a footprint of only 3.8 m x 6.3 m. A detailed description was presented at the IBA conference 2005 in Seville. The system is primarily designed for the measurement of 14C, 10Be and 26Al, but additionally supports the measurement of heavy ions like iodine and plutonium. The analysis of 14C is done at charge state 1 and using the high stripper gas thickness of ca. 2 µg/cm2 to destroy molecular background of 12CH2 or 13CH. Early experiments on the system to be installed at the CNA, Seville (Spain) indicate that the background is below 3 x 10-15 for 14C. For the analysis of 10Be, isobaric 10B is removed by means of the nuclear charge dependent energy loss in an absorber foil that is positioned before the electrostatic analyser. Tests have shown that the background from 10B is substantially below 10-15. Other contributions in the 10-14 range are presently under investigation. For 26Al the background level is below 5 x 10-14. A 5 MV version of its AMS the range is presently under construction for the University Aix-Marseille III, Cerege (France). This system supports the analysis of a variety of elements including 36Cl and 41Ca. For the measurement of 36Cl, the interfering isobar 36S is suppressed by the use of an absorber foil. The rare isotope is identified using a high-resolution ionisation chamber detector with four dimensional data acquisition.
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