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A high resolution injector system has recently been installed at the Lund 3 MV tandem Pelletron accelerator. The new injector, designed mainly for 26 Al ions, will increase the experimental potential of the Lund AMS facility considerably. High quality energy-and mass-resolution is obtained by using a 90 AE spherical electrostatic analyzer followed by a 90 AE magnetic analyzer. The injector is equipped with a high intensity sputtering source with a spherical ionizer.A new analytical technique for acceptance calculations as well as PC-based computational methods have been used in the design of the ion optical system of the new injector.Compared to our old injector system which has a magnetic analyzer with a bending angle of only 15 AE , the new system has a more than ten times better resolution. The beam optics of the new system is also better designed to match the accelerator acceptance. In this way the ion transmission from the ion source to the detector, for different ions of interest in our AMS programme, has been increased.

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