2.3 JUSO Setup

Figure 2.2: JUSO setup

The experimental system JUSO at the University of Osnabrück (Figure 2.2) is an UHV system with a base pressure in the low \( 10^{-9} \)mbar range. Primary ions are extracted from a plasma ion source and mass analyzed by a 90\( ^{\circ }\) sector field magnet. With an electric deflection system in front of the analyzing magnet the primary beam can be pulsed to allow time-of-flight (TOF) measurements. The scattering surface is mounted on a three axis manipulator equipped with electron beam heating. A thermocouple is used for temperature control. Downstream from the target, a TOF tube is mounted at a fixed scattering angle of 10\( ^{\circ }\). Scattered ions are separated from scattered neutral particles by a postacceleration stage. Two stacked microsphere plates (MSP) [15] are used as the detector. The angle aperture for detection is 1.2\( ^{\circ }\). Neutral primary particles are produced by neutralization of the primary ion beam in a gas cell, placed between the sector magnet and the target chamber.

March 2001 - Martin Wieser, Physikalisches Institut, University of Berne, Switzerland