IOSPress

Positron annihilation spectroscopy is a relatively new method for studying the microscopic properties of condensed matter. The progress in the capabilities of the positron annihilation techniques is due to the development of positron beam technology. During the last decade the instrumentation for positron studies has been extended with: i) new brightness enhanced positron beams for positron re-emission microscopy, high resolution low energy positron diffraction and the positron micro-probe, ii) new intense positron sources and iii) improved beam transport and focusing. This publication describes the design and performance of an electrostatic variable energy positron beam with several separate beam-lines. It is developed for Doppler-broadening and positron lifetime measurements with an improved lateral resolution and for re-moderation studies in the transmission mode. The latter is a step forward in the development of a high-brightness positron micro-beam.