Details
| Original language | English |
|---|---|
| Qualification | Doctor rerum naturalium |
| Awarding Institution | |
| Supervised by |
|
| Date of Award | 21 May 2021 |
| Place of Publication | Hannover |
| Publication status | Published - 2021 |
Abstract
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Hannover, 2021. 112 p.
Research output: Thesis › Doctoral thesis
}
TY - BOOK
T1 - Bose-Einstein condensation of 41K and 87Rb on an atom chip for sounding rocket missions
AU - Piest, Baptist
N1 - Doctoral thesis
PY - 2021
Y1 - 2021
N2 - This thesis presents the next generation atom chip apparatus for the sounding rocket missions MAIUS-2 and -3. With the new apparatus, Bose-Einstein condensates containing 3 · 10E5 atoms of Rb-87 or 6 · 10E4 atoms of K-41 are generated within 3.4 s in ground-based operation. In addition, quantum degenerate mixtures with variable isotope ratios can be provided. An analysis of sympathetic cooling of K-41 under the influence of gravity and prospects for thermalization rates in microgravity are given. The expansion dynamics of single species Bose-Einstein condensates released from a magnetic trap is analyzed in detail. It is shown that transient magnetic fields during trap switch-off have a considerable impact on the expansion dynamics. Further, collective excitations of single and mixed ensembles are evaluated. Due to interspecies damping, collective excitations of interacting mixtures of K-41 and Rb-87 are strongly suppressed. Finally, the influence of gravity on a trapped and strongly interacting mixture is observed via rotation of the whole apparatus.
AB - This thesis presents the next generation atom chip apparatus for the sounding rocket missions MAIUS-2 and -3. With the new apparatus, Bose-Einstein condensates containing 3 · 10E5 atoms of Rb-87 or 6 · 10E4 atoms of K-41 are generated within 3.4 s in ground-based operation. In addition, quantum degenerate mixtures with variable isotope ratios can be provided. An analysis of sympathetic cooling of K-41 under the influence of gravity and prospects for thermalization rates in microgravity are given. The expansion dynamics of single species Bose-Einstein condensates released from a magnetic trap is analyzed in detail. It is shown that transient magnetic fields during trap switch-off have a considerable impact on the expansion dynamics. Further, collective excitations of single and mixed ensembles are evaluated. Due to interspecies damping, collective excitations of interacting mixtures of K-41 and Rb-87 are strongly suppressed. Finally, the influence of gravity on a trapped and strongly interacting mixture is observed via rotation of the whole apparatus.
U2 - 10.15488/11014
DO - 10.15488/11014
M3 - Doctoral thesis
CY - Hannover
ER -