High frequency ion accelerator with drift tubes

The ion accelerator has an accelerating resonator in the form of a double conductive walled cavity whose inner (4) and outer (1) walls are energised by anti-phase signals. The cavity has two internal electrodes assymmetrically disposed in the cavity and an ion source (14) to one side of the cavity coupled by a drift tube (13). A number of further drift tubes (5,7,9,11,) are disposed within the cavity, aligned with the first cavity and with an outlet drift tube (13) on the opposite wall coupled to an outlet arrangement (15). The odd numbered drift tubes are coupled to the inner wall (4) of the resonant cavity, and the even numbered drift tubes are coupled to the open end of the first internal electrode. The axis of the path through the drift tubes in perpendicular to the long axis of the resonant cavity. The axis of the electrode adjacent to the ion source is offset from the cavity axis by 0.5 to 0.7 of the cavity radius, and the axis of the electrode adjacent the ion exit is offset by 0.1 to 0.4 of the cavity radius. The difference in circumferences of the two electrodes lies in the range 1.5 to 2.5. L'INVENTION CONCERNE LES ACCELERATEURS D'IONS A HAUTE FREQUENCE COMPRENANT UN RESONATEUR ACCELERATEUR QUI COMPORTE DES ELECTRODES INTERNES, DES TUBES DE GLISSEMENT ET UN ECRAN EXTERNE AINSI QU'UN OSCILLATEUR A HAUTE FREQUENCE, UNE SOURCE D'IONS ET UN DISPOSITIF DE SORTIE RELIES AU RESONATEUR.LES TUBES DE GLISSEMENT 13, 7, 11 SONT RELIES A L'ECRAN EXTERNE 4 ET LES TUBES DE GLISSEMENT 5, 9 AUX ELECTRODES INTERNES 2, 3 QUI SONT DISPOSEES DE FACON ASYMETRIQUE PAR RAPPORT A L'AXE LONGITUDINAL DE L'ECRAN EXTERNE 4 ET RELIEES ENTRE ELLES PAR UN DISQUE CONDUCTEUR 16.APPLICATION COMME INJECTEUR D'IONS POUR LES SYNCHROTRONS OU COMME SECTION PRE-ACCELERATRICE DES ACCELERATEURS LINEAIRES D'IONS A FORTES ENERGIES.