Heavy Ion Injection for Stripping in the Central Region of the Cevil

We plan to inject a heavy ions beam, previously accelerated, into the median plane of the Orsay CEVIL. The heavily charged ions, obtained after the stripping operation in the central region of the cyclotron, can achieve an energy proportional to the square of the charge number. The choice of injection energy represents, in fact, a compromise between price and performance. The e/m ratio, chosen to be ≫ 0,1, will give the possibility of accelerating heavy ions up to bromine, and Krypton. The injector will be a linear accelerator, either pulsed or continuous. The distance between the linear accelerator and the cyclotron will allow the debunching of beam packets, at the RF frequency (25 Mc/s). The drift tube circuit is similar to the Manchester one. We have gone duply into the problem of the focusing system in order to obtain an accelerated beam of more than 100 μA. The chosen solution was strong focusing grids, obtained by means of two parallel tungsten strips placed at the beginning of each drift tube, each pair being at 90° to the preceeding one. The theoretical studies of this apparatus are well advanced at present ; the industrial production of the main elements is under way. The whole equipment should be completely finished in July 1967.