Quasi-Free Scattering off Neutron-Rich Oxygen and Fluorine Isotopes at Relativistic Beam Energies at R3B

The structure of the neutron-rich oxygen and fluorine isotopes with 11 neutrons up to 14 neutrons has been investigated by utilizing the quasi-free scattering (QFS) in inverse kinematics with a proton-rich target at the R3B setup at GSI-Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany. To analyse the reaction channels of interest 19O(p, 2p)18N, 20O(p, 2p)19N, 21F(p, 2p)20O, 22F(p, 2p)21O, and 23F(p, 2p)22O, the delivered relativistic incoming beam from the FRagment Separator (FRS) was identified using a variety of detectors in front of the reaction area. In addition, the outgoing particles are identified around and after the reaction area. Therefore, the ALADIN dipole magnet was used after the reaction area to separate the reaction products. The gathered data were used to deduce the inclusive reduction factor for the simple cases by comparing the inclusive experimental cross section to the total theoretical one of the related orbit based on the eikonal reaction theory. Furthermore, the study presents a comparison between the experimental and theoretical momentum distributions for the residuals of interest. This study has shown a good agreement between the measured and calculated momentum distributions. Furthermore, the obtained inclusive reduction factors support the claim of the weak or no dependence on isospin asymmetry. Moreover, the value of the obtained inclusive reduction factor of the reaction channel 22F(p, 2p)21O is within the range of the reduction factors of the oxygen isotopic chain. Furthermore, the obtained result from testing the future R3B Si-tracker in STFC Daresbury is presented. This tracker aims to increase the sensitivity of hadron-induced quasi-free scattering at the R3B setup

Transverse excitation for beam diagnostics and slow extraction from synchrotrons

Transverse excitation is a key method required for the operation of synchrotrons, a type of circular particle accelerator suitable for a wide range of applications. The excitation is essential to control the beam: First, it is used in the context of beam diagnostics to enable monitoring of the accelerator's working point (tune). This is required to setup the machine and to avoid unintentional beam losses. Second, it is used in the context of resonant slow extraction to drive and control the extraction of particles from the accelerator. This method referred to as Radio Frequency Knock Out (RF-KO) enables the delivery of defined beam intensities for experiments or medical treatments. Transverse excitation is performed by creating a time-dependent electromagnetic field through which particles are deflected on each subsequent turn in the synchrotron. To generate this dipolar field with frequencies in the radio frequency (RF) domain, signal generators, amplifiers and stripline kickers (exciters) are utilized.This thesis comprises a detailed study of the method of transverse excitation. Special focus is placed on the nonlinear beam dynamics, the composition and generation of the excitation signal and the peripheral systems (detectors, exciters). An excitation system for tune diagnostics and one for resonant slow extraction is developed and used to study different methods for transverse excitation experimentally. Particle tracking simulations are carried out to gain a detailed understanding of the excitation process. Based on the findings from experiments and simulations, recommendations are given for the improved application of excitation techniques. Two new excitation methods for resonant slow extraction are developed, studied and compared to other commonly applied methods. The sensible application of these excitation techniques is essential to improve the quality of the particle beam and the operation and performance of the synchrotron