INNOVATIVE BEAM DIAGNOSTICS FOR THE CHALLENGING FAIR PROJECT

The planned FAIR facility will consist of two heavy ion synchrotrons for high current operation and four large cooler storage rings. A complex operation scheme with multiple use of the transport lines is foreseen. The facility demands an exceptional high dynamic range from the beam instrumentation. Due to the large beam power, nondestructive methods are mandatory for high currents. Precise measurements of all beam parameters and automatic steering or feedback capabilities are required. Due to the ultra-high vacuum condition and the demanding measurement accuracy, novel technical solutions are foreseen. An overview of the challenges and projected innovative solutions for various diagnostic installations is presented. DEMANDS FOR FAIR-DIAGNOSTICS The Facility for Anti-Proton and Ion Research FAIR ,a s shown in Fig. 1, will be a very versatile accelerator complex for all ion species from protons up to Uranium [1]. Beside a new proton-LINAC, the existing UNILAC and SIS18 will serve as injectors, but up-grades for high current operation are under way. High currents of primary beams, even in low charge states, will be stored and accelerated with a large in-coherent tune spread up to ΔQ � 0.5 in the super-conducting SIS100. The design cases are 5 · 10 11 U 28+ ions at an energy of 1.5 GeV/u and 4 · 10 13 protons at 29 GeV. SIS300 serves as a stretcher ring or, after further stripping, as an accelerator for heavy ions up to GeV/u. Radioactive ions can be generated either for investigations at fixed targets or injection into the storage rings. They are stochastically cooled in CR and RESR and electron cooled in NESR. Further beam manipulations including deceleration are possible there. The NESR also serves as an experimental tool for cooled stable ions. The anti-protons are precooled in the CR and accumulated in the RESR, before being accelerated up to 14 GeV in the HESR. Here high energetic electron cooling enables spectroscopic investigations at an internal target. Pulse-to-pulse operation with different ion species and beam parameters is an integral part of the facility. Deduced from the accelerator parameters, the following main demands for beam diagnostics are challenging and require detailed R&D, which is partly started: Common realization: Although the beam parameters of the FAIR synchrotrons and storage rings are quite different, common realizations for all accelerators are mandatory to save man-power during the R&D phase and to reduce the costs during construction. Large dynamic range: The central characteristic of FAIR ∗ Partly funded by the European Union’s FP6 under DIRAC-PHASE-1,