Power supply design for the tracker detector of the AMS experiment

The AMS experiment is devoted to the measurement of the antimatter component of cosmic rays in particular the detection of anti-nuclei. The apparatus will operate in space. A preliminary version will fly in 1998 on a Space shuttle mission. The complete system will be installed on the space station Alpha in 2001. The apparatus, in its complete version, will be composed of a magnetic spectrometer based on a microstrip silicon tracker and on a permanent magnet. This instrument will measure the momentum and the magnitude and sign of the charge of the incoming cosmic ray. A time-of-flight detector will be used as a trigger, for up-down rejection and for the measurement of velocity for low-energy particles. A threshold Cherenkov detector will provide further up-down discrimination. An anti-coincidence system, placed on the lateral inner wall of the magnet, will provide suppression of the background due to interaction of primary cosmic rays with the magnet. A transition radiation tracker will identify electrons. This paper describes the power supply system for the tracker detector giving also a short description of the tracker detector electronics to be powered. Results of preliminary tests and studies are also reported.