Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.69: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

Fluent Simulations for the Cryogenic Stopping Cell for the low energy branch at FAIR — •Frank Morherr for the FRS Ion Catcher collaboration — JLU Giessen

A cryogenic stopping cell (CSC) has been developed for the low-energy branch of the Super-FRS at FAIR, GSI, Germany. The stopping cell technique is based on the stopping of in-flight separated high energetic ions in a noble gas, Helium in our case. The system design is based on the Super-FRS beam properties. By SIMION simulations the flow of the Ions in the DC-field along the stopping cell length and the ion trajectories along the DC-field of the CSC and the behavior of the RF carpet have been simulated using SIMION code in our group. Until now simulations of the gas flow are missed. Especially the design of the nozzle, where the Ions leave the stopping cell has not been investigated in detail. In the current design a straight extraction nozzle is used. With a laval-nozzle there exists a convergent solution. The goal is, to design an extraction nozzle such, that the gas flow through the nozzle becomes stable for high densities to lead the Ions. So they can be catch by the extraction RFQs. For low densities far away the gas must escape sideward so it is possible to pump it away. The gas dynamics at the extraction nozzle have been simulated using ASNYS Fluent Calculations, they will be combined with ion optics simulations, first results will be presented and allow understanding the behavior of the ions.