SOLENO, A SUPERCONDUCTING SOLENOIDAL COIL USED AS A SPECTROMETER FOR NUCLEAR CHARGED-PARTICLE STUDIES AROUND ZERO DEGREES

A new type of spectrometer for nuclear charged particle studies have been designed and built at the 13 Mv tandem accelerator of the Institut de Physique Nucleaire at Orsay (France). It makes use of the focusing properties of an axial magnetic field of 3. 17 T (at maximum value) produced by a superconducting solenoidal coil. The basic properties of such a device are the following: true azimuthal symmetry, large angular acceptance (up to 10 degree ), reduced geometrical and mechanical aberrations leading to a bandwidth of 5% in magnetic ridigity. Associated with a detection system of small size, this spectrometer is now used around zero degrees for coincidence experiments and to collect and identify in mass, fusion evaporation residues. In the latter case, the system operates like a recoil mass separator (RMS).