Modification Projiect Of The Terminal Electrode In HI-13 Tandem Accelerator And Investigation Of Target Materials For Target-Source Of ISOL

This article consists of two parts, one is modification project of the terminal electrode in HI-13 tandem accelerator, another is investigation of target materials for target-source of ISOL.The HI-13 tandem accelerator of China Institute of Atomic Energy has been running since October 1987, the discharging between terminal electrode and ground has always been a primary restricting cause in the lifting of terminal voltage. After the upgrade of acceleration tube in October 2004, It has been proposed that the voltage on terminal electrode can be lifted by reducing the surface electrostatic field and modification of the shape of terminal electrode from opening cat cage to a close whole part, discarding the equipotential rings, extending the elliptical edge of terminal electrode to the position of 0# equipotential rings.In this work the surface electrostatic field distributing of several possible shapes of the terminal electrode are calculated with Poisson code of Superfish software, two type of optimized modification configuration in different situation are suggested: one is modification the shape of terminal electrode only, another is modification the shape of equipotential rings and the shape of terminal electrode.In the upgrading project of tandem accelerator, Isotope Seperated On Line (ISOL) is a critical part, as it connecting cyclotron in the front and tandem accelerator and post accelerated system at back. The high temperature and strong radioactivity target-source system is one of the critical techniques in ISOL.At present, the candidate target materials are natural Copper, Aluminum, Molybdenum, Lead, Tungsten, Tantalum and Uranium, the candidate configuration materials are Carbon, Water, Stainless steel. Such questions should be investigated: can the interaction of targets with 100MeV, 200μA intense proton beams produce interestedradioactive nuclides, is there any long-life radioactive nuclides, can the radioactivity level fall to an accepted level? This work intends to provide some references for the design and maintenance of target ion source.In this work the radioactive nuclides activity and ray intensity produced by the interaction of candidate target materials and body materials except Uranium with 100MeV,200μA intense proton beams are calculated by LCS+C-BURN code, Also the activity ofradioactive nuclides and ray intensity produced by the interaction of uranium target with intense proton beams are calculated by SHIELD code and CYF+NETWORK code. All of the results are compared with the results calculating by the theoretical module of LCS combining with C-BURN code.