SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Ultra-cold atoms, ions, and BEC (joint session A/Q)
A 16.7: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Design of high-field coils for Feshbach resonances and rapid ramps in lithium-6 — •Felix Lang1, Maximilian Kaiser1,2, Sian Barbosa1, Jennifer Koch1, Benjamin Nagler1, and Artur Widera1 — 1Department of Physics and Research Center OPTIMAS, Technische Universitaet Kaiserslautern, Germany — 2Physics Institute, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg
Realizing the BEC-BCS crossover in ultracold fermionic gases of lithium-6 requires high magnetic fields to address the Feshbach resonance at 832G [1]. One important tool for the control of such systems is the use of rapid magnetic-field ramps which enables, e.g., the detection of fermionic pair condensates [2].
Here I report on the design of a low-inductance Helmholtz coil pair for high currents up to 400A which complies with these contrary conditions. Numerical calculations of the magnetic field are used to optimize the coil geometry, while complimentary electrical-circuit simulations provide insight into attainable switching times. In addition, I discuss the cooling infrastructure and temperature surveillance, as well as the elaborate manufacturing process of the coils.
[1] R. Grimm, in Proceedings of the International School of Physics "Enrico Fermi", Vol. 164, edited by C. S. M. Inguscio W. Ketterle (2007) pp. 413-462.
[2] M. W. Zwierlein, C. H. Schunck, C. A. Stan, S. M. F. Raupach, and W. Ketterle, Physical Review Letters 94, 180401 (2005).