You are here

Application of Laser Cooling to Ultra-High Precision Measurements of Ions in a Penning Trap

Title: Application of Laser Cooling to Ultra-High Precision Measurements of Ions in a Penning Trap.
17 views
5 downloads
Name(s): Smith, Jordan A, author
Type of Resource: text
Genre: Text
Bachelor Thesis
Date Issued: 2018-04-20
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Precision cyclotron frequency ratio measurements of single ions in a Penning Trap allow us to determine atomic masses and magnetic moments to high precision. These measurements are then used in the fields of fundamental physics, nuclear physics, and physical chemistry as well as used to determine fundamental constants. In current Penning traps for precision measurement, cyclotron frequencies are measured by exciting the cyclotron motion to a certain radius and then amplifying image currents induced by the ion’s cyclotron or axial motions in a resonant circuit connected to the trap electrodes using a FET or SQUID amplifier. Reducing the ion temperature in a Penning Trap is necessary to reduce relativistic and other systematic shifts of the cyclotron frequency. Laser cooling would allow us to reduce the ion temperature and laser induced fluorescence can be used in ion detection. Limitations of modern lasers and suitable ions for laser cooling allow for only a handful of ions to be laser coolable. In particular, trapped 9Be+ and 24Mg+ ions have suitable cycling transitions (S1/2 – P3/2) with wavelengths that can be produced at reasonable intensity by modern lasers. These ions can be laser cooled to ~ 1 mK (their Doppler limits), much lower than our currently achievable ion temperatures (of order 100 K). Through sympathetic cooling, other ion species can be cooled to mK temperatures as well. In this thesis, I show how an 8.5 T magnetic field affects laser cooling and sympathetic cooling of ions in a Penning Trap, as well as show that the current Florida State University Penning Trap will need to be replaced by a newly designed trap in order to achieve effective cooling via these means.
Identifier: FSU_libsubv1_scholarship_submission_1524694966_698ffe17 (IID)
Keywords: Penning Trap, Ions, Laser Cooling, Mass Spectroscopy
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1524694966_698ffe17
Owner Institution: FSU

Choose the citation style.
Smith, J. A. (2018). Application of Laser Cooling to Ultra-High Precision Measurements of Ions in a Penning Trap. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1524694966_698ffe17