Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Instrumentation XIII

HK 52.2: Vortrag

Donnerstag, 17. März 2016, 14:15–14:30, S1/01 A3

CFD-Simulations of a 4π-continuous-mode dilution refrigerator for the CB-ELSA experiment — Marcel Bornstein, Hartmut Dutz, Stefan Goertz, Scott Reeve, and •Stefan Runkel for the CBELSA/TAPS collaboration — Physikalisches Institut, Bonn, Germany

The polarized target group at Bonn operates a dilution refrigerator for double polarization experiments at the Crystal Barrel in Bonn. To get high target polarizations and long relaxation times low temperatures are indispensable. To reach temperatures below 30 mK and to allow for the use of an internal polarization magnet, the polarized target group is building a new continuous mode dilution refrigerator. As a optimizing tool for the construction of dilution refrigerators and for a better understanding of the different incoming and outgoing fluid streams several Computational Fluid Dynamic simulations are done. The heat exchange between the different streams of the refrigerator were simulated for the precooling stages within one simulation including a submesh for each fluid and solid. This leads to a better estimation of the flow characteristics and the operational parameter of the refrigerator. The last steps of construction and the preparation of the refrigerator for first test measurements are ongoing.