Low-energy ion decelerator for an external injection line at the NIRS-930 cyclotron

Abstract

Articles you may be interested inInvestigations on the structure of the extracted ion beam from an electron cyclotron resonance ion sourcea) Rev. Sci. Instrum. 83, 02B720 (2012); 10.1063/1.3673633 A 2.45 GHz electron cyclotron resonance proton ion source and a dual-lens low energy beam transporta) Rev. Sci. Instrum. 83, 02A329 (2012); 10.1063/1.3669802Low energy beam transport for facility for rare isotope beams driver linear particle acceleratora) Rev. Sci. Instrum. 83, 02B705 (2012); 10.1063/1.3665968Measurements of transverse ion beam emittance generated by high current ion sources at the GSI test injector facility HOSTIa) Rev. Sci. Instrum. 81, 02B707 (2010);A low-energy ion decelerator for the acceleration-deceleration system has been designed and installed in the beam-injection line of the NIRS-930 cyclotron in an attempt to increase the beam intensity from the cyclotron. With this acceleration-deceleration system, the beam intensity of 12 C 4+ ions at the cyclotron exit has been increased by about five times. The system has an advantage in that it allows us to extract a high-current ion beam from an electron cyclotron resonance ion source because, independently of the injection-energy matching to the cyclotron, a large potential difference can be applied between the source and the extractor. The voltage applied to the extractor is about −12 kV, which is reduced to the ground potential by the decelerator. The electric field distributions in the deceleration system were carefully designed using a three-dimensional field simulator. Design studies of the decelerator as well as the result of a beam test are presented.

Status of a compact electron cyclotron resonance ion source for National Institute of Radiological Sciences-930 cyclotron

“…2 It has been used for the operation of the NIRS-930 cyclotron since 2006, after improvements such as the preparation of a spiral inflector, installation of a shield to reduce the magnetic field leakage at the injection line, and the installation of a decelerator. 3 The schematic layout of the decelerator system and its potential distribution are shown in Figure 1. The decelerator was installed in order to match the conditions for using a spiral inflector, allowing the higher extraction voltage needed to increase the extracted beam intensities from the ion source.…”