Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 140, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4866906
Keywords
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Funding
- German Chemical Industry Fund (FCI) through a Kekule Mobility Fellowship
- ETH Fellowship Program
- Engineering and Physical Sciences Research Council (U.K.) EPSRC(GB) [EP/G00224X/1, EP/I029109/1]
- Engineering and Physical Sciences Research Council [EP/I029109/1, EP/G00224X/1] Funding Source: researchfish
- EPSRC [EP/G00224X/1, EP/I029109/1] Funding Source: UKRI
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Zeeman deceleration is an experimental technique in which inhomogeneous, time-dependent magnetic fields generated inside an array of solenoid coils are used to manipulate the velocity of a supersonic beam. A 12-stage Zeeman decelerator has been built and characterized using hydrogen atoms as a test system. The instrument has several original features including the possibility to replace each deceleration coil individually. In this article, we give a detailed description of the experimental setup, and illustrate its performance. We demonstrate that the overall acceptance in a Zeeman decelerator can be significantly increased with only minor changes to the setup itself. This is achieved by applying a rather low, anti-parallel magnetic field in one of the solenoid coils that forms a temporally varying quadrupole field, and improves particle confinement in the transverse direction. The results are reproduced by three-dimensional numerical particle trajectory simulations thus allowing for a rigorous analysis of the experimental data. The findings suggest the use of a modified coil configuration to improve transverse focusing during the deceleration process. (C) 2014 AIP Publishing LLC.
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