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A new quasi-monoenergetic neutron beam facility has been constructed at The Svedberg Laboratory (TSL) in Uppsala, Sweden. Key features include a neutron energy range of 11-175 MeV, high fluxes, user flux control, flexible neutron field size and shape, and spacious and easily accessible user area. The first results of the beam characterisation measurements are reported.

perturbation approach, we seek modeling errors in the The ever-increasing demand for better performance from following parameters circular accelerators requires improved methods to calibrate • Quadrupole gradients the optics model. We present a linear perturbation approach to°Corrector scale factors the calibration problem in which the modeled BPM-to-• BPM scale factors corrector response matrix is expanded to first order in • BPM resolution errors .,:,:a_rupole strengths. The result is numerically fit to the measured response matrix yielding quadrupole strength errors, including a comprehensive error analysis of the results. From corrector strength errors, and BPM linearity factors. The large the difference orbit measurements, we first determine the number of degrees of freedom in the fit allows a BPM-to-correctorresponsenmtrixcoefficients comprehensive error analysis, including the determination of Ax at BPM i BPM resolutions. In this way, a self-consistent first order _ij = (1) optics model of SPEAR was generated which reproduces the Ax' at corrector j measured tunes, which are then compared to the perturbed expression for the

High-energy electron cooling, presently considered as an essential tool for several applications in high-energy and nuclear physics, requires an accurate description of the friction force which ions experience by passing through an electron beam. Present low-energy electron coolers can be used for a detailed study of the friction force. In addition, parameters of a low-energy cooler can be chosen in a manner to reproduce regimes expected in future high-energy operation. Here, we report a set of dedicated experiments in CELSIUS aimed at a detailed study of the magnetized friction force. Some results of the accurate comparison of experimental data with the friction force formulas are presented.