Developments for the Injection Kicker Vacuum System of the HESR at FAIR

The Research Center Jülich has taken the leadership of a consortium being responsible for the design and manufacturing of the High-Energy Storage Ring (HESR) going to be part of FAIR. The HESR is designed both for antiprotons and for heavy ion experiments. The injection kicker system of the HESR is located directly behind the septum and consists of two pumping crosses for pumps and measurement devices as well as two vacuum tanks housing the four ferrite magnets which will be operated with 40 kV, 4kA. As well as the magnets, the adjustments frames and the electrical feedthroughs will be installed inside the tanks. Due to the large surface of the magnets the injection kicker system will be very sensitive with regard to the achievable vacuum quality that is expected to be in the order of 10⁻¹¹ mbar or better. Thus the vacuum system is designed to heat up to 250°C. In order to investigate the achievable end pressure and to develop the heating system a test facility was constructed. The actual vacuum layout of the injection kicker system as well as the experimental test results will be presented and in similar the layout of the control system of the test facility will be described

A polarized 3He Target for the Exploration of Spin Effects in Laser-induced Plasmas

In order to investigate the polarization degree of laser-accelerated 3He ions from a polarized 3He gas-jet target, several challenges have to be overcome. One of these is the development of an appropriate polarized 3He gas-jet target. Since our experiments are carried out at the PHELIX Petawatt Laser Facility, GSI Darmstadt, the layout of the set-up has to cope with the available space within the PHELIX target chamber. The essential components of such a layout are a magnetic holding field for storing polarized 3He gas inside the vacuum chamber for many hours, the gas-jet source for providing the desired laser target, and finally, a polarimeter for measuring the spin-polarization degree of laser-accelerated 3He2+ ions