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Guiding, deceleration and detection of SrF

Nijbroek, T.H. (2013) Guiding, deceleration and detection of SrF. Master's Thesis / Essay, Physics.

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In this thesis a series of simulations of the Stark ring decelerator with a supersonic expansion are described. Sisyphus deceleration, the guiding and repumping of molecules through a ring decelerator were simulated. Sisyphus deceleration works by pumping a molecule between two states: when the potential energy of the molecule is maximal (and the kinetic energy minimal) it will be transported to the other state where it will climb a potential hill again losing its kinetic energy. The Sisyphus deceleration scheme proved conceptually feasible, deceleration of over 6000 m/s2 was obtained. The main difficulties implementing this scheme will be to prevent the large molecule losses that will occur using this scheme. The guiding of molecules in the rotational levels of SrF have been simulated as to see whether experimental guiding results using the Stark decelerator can be compared to the simulations, qualitatively this was difficult and quantitative results were not yet obtained. Also the effect of a repump laser on the guiding results was explored. This laser pumps the molecules from the high-field seeking state (hfs) to the low-field seeking (lfs) state, this should reduce the losses and improve the number of pasing molecules. It proved possible to reach an enhancement factor of 1.9 while repumping the molecules from a hfs to a lfs state. Finally hearing aid microphones were implemented in ultra high vacuum to detect the supersonic expansion of argon. It proved to be a cheap and reliable way to detect the beam. Also using the microphones in an array made it possible to improve the alignment of the gas beam through the central axis of the decelerator.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:54
Last Modified: 15 Feb 2018 07:54

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