Tiara
TIARA is designed for nucleon transfer reactions with radioactive beams to study the physics of changing shell structure and collectivity far from stability.
TIARA is a very compact array of silicon diode detectors which surrounds the target. A barrel of detectors are placed symmetrically around the beam direction, and are position-sensitive with respect to the scattering angle, covering scattering angles from approximately 40 to 140 degrees. The forward and backward ends are covered by annular silicon strip detectors placed beyond the ends of the barrel. The whole device is designed to be mounted inside the most compact geometry of the EXOGAM gamma-ray array at GANIL. In addition, the EXOGAM and TIARA set-up can be mounted at the entrance of the VAMOS spectrometer, which has been constructed at GANIL specifically for radioactive nuclear beam studies.
The major items of equipment for this projects are in three categories:
- Charged particle detectors
- Mechanical construction
- Electronics
The state-of-the-art detectors were specially designed to fit into the tight geometrical constraints, and took advantage of the latest developments in mounting and channel-handling technology. This involved working closely with European manufacturers.
The mechanical construction involved working closely with the project engineering division at Daresbury to convert the physicists ideas and concepts into a real device. High quality vacuum equipment was needed to satisfy the specifications for the beam-line at GANIL, and in particular to deal with the gas-filled beam tracking detectors. The structure to support the close-packed gamma-ray array had to be secure and accurately positioned. This involved the design of a streamlined and simplified version of the EXOGAM support.
The electronics is based on the use of preamplifiers from the University fo the West of Scotland and the spectroscopy amplifiers are commercial 16 channel NIM units that are compatible with existing modules employed at GANIL. They are suitable for both gamma-ray and charged-particle spectroscopy which gives flexibility for different set-ups. The data acquisition equipment was designed to merge the TIARA electronics with the data acquisition systems of EXOGAM and GANIL.
The TIARA home page can be found at http://www.ph.surrey.ac.uk/~phs1wc/tiara/index.html
| Photo gallerie | CAD gallerie | Simulations page |
|---|
Contacts