Improvement in accelerator technology: Award for Dr. Rahul Singh


The GSI Management awarded Dr. Rahul Singh of the GSI Beam Instrumentation department a certificate for significant technical improvement to optimize beam properties for physics experiments. Together with an expert team (comprising of Dr. Peter Forck from beam instrumentation, Dr. Stefan Sorge from the Accelerator Physics department and Dr. Andrzei  Stafiniak of the Electric Power Systems department) Dr. Singh carried out very successful development works to improve the slow extraction from SIS18. As a result, the beam quality provided by GSI accelerators to the science community was significantly improved.

Main goal of the Beam Instrumentation department is to inspect the ion beam with highest precision. The key feature is high-end measurement technology for ion beams, which is applied to detect all relevant beam parameters, such as beam position or intensity and their temporal evolution. Only through high-precision measurements provided to the operating team, both, accelerator and ion beam, can be further optimized.  

An important pre-requisite to carry out nuclear physics experiments at GSI and FAIR efficiently, is the provision of ion beams with constant intensity during slow extraction of the accelerated ions from SIS18. The slow extraction process reacts very sensitive on perturbations, like e.g. small fluctuations of the magnet currents. Since many years these perturbations are the subject of detailed experimental studies, as well as investigations based on particle dynamics simulations, with the goal to efficiently suppress the perturbations. In the past two years, Dr. Rahul Singh carried out a number of measurements to pinpoint the source of the fluctuations in the so-called spill-structure in the millisecond regime and to model the influence of the magnet power supplies on beam quality. 

In a joint effort, Dr. Rahul Singh and the team of experts successfully developed a novel technique to improve the spill-structure and immediately implemented the system during the beamtime. The new technique allowed for smoothing out the spill-structure. In particular, the HADES experiment benefited instantaneously from the technical improvement by a 45% increased event statistics in the previous experiment campaign.

The technology developed by the team is very promising for the future and will not only increase the efficiency for many physics experiments at SIS18, but also at the large SIS100 accelerator ring of the future FAIR accelerator center. (BP)