Author/Authors :
Pouthas، نويسنده , , J. and Bertaut، نويسنده , , A. and Borderie، نويسنده , , B. and Bourgault، نويسنده , , P. and Cahan، نويسنده , , B. and Carles، نويسنده , , G. and Charlet، نويسنده , , D. and Cussol، نويسنده , , D. and Dayras، نويسنده , , R. and Engrand، نويسنده , , M. and Jouniaux، نويسنده , , O. and Le Botlan، نويسنده , , P. and Leconte، نويسنده , , A. and Lelong، نويسنده , , P. and Martina، نويسنده , , L. and Mosrin، نويسنده , , P. and Olivier، نويسنده , , L. and Passerieux، نويسنده , , J.P. and Piquet، نويسنده , , B. and Plagnol، نويسنده , , E. and Plaige، نويسنده , , E. and Raine، نويسنده , , B. and Richard، نويسنده , , A. and Saint-Laurent، نويسنده , , F. and Spitaels، نويسنده , , C. and Tillier، نويسنده , , J. and Tripon، نويسنده , , M. and Vallerand، نويسنده , , P. and Volkov، نويسنده , , P. and Wittwer، نويسنده , , G.، نويسنده ,
Abstract :
INDRA is a 4π detection array designed for the studies of “hot nuclei” at the heavy ion accelerator GANIL. The INDRA multidetector is composed of 96 ionization chambers, 196 silicon detectors, 324 CsI(TI) scintillators and 12 NE102/NE115 phoswich detectors. This article describes the associated electronics. The signal treatment is performed through specifically designed modules, most of which are in the new VXIbus standard. This standard allows us to considerably reduce the number of modules by regrouping many functions in the same module. For example, all the functions related to 24 CsI(TI) scintillators are stacked in one D-size module. VXIbus also provides the opportunity to locate all the electronics close to the detector, in the beam cave, with full remote control (VXI-VME buses) including visualization of analogic and logic signals on oscilloscopes. The large dynamic range (4000 to 1) required for the silicon detectors is reached by means of a new method: a low noise amplifier providing a unipolar signal which is charge integrated and converted on two dynamic ranges. The trigger system relies on a new working mode called “asynchronous mode” and performs event selections based on multiplicity functions which are built up from subgroups of detectors. The performances of the data acquisition and the graphical software packages which were developed to set up and control the electronic parameters are also presented.
