Experimental study of ultracold Ca (40) plasma

QUEST Center event
Yes
Speaker
Dr. Evgeniya Vilshanskaya (visiting with Lev Khaikovich), Joint Institute for High Temperatures, Russian Academy of Sciences
Date
07/02/2024 - 13:00 - 12:00Add to Calendar 2024-02-07 12:00:00 2024-02-07 13:00:00 Experimental study of ultracold Ca (40) plasma Experimental study of ultracold 40Ca plasma This work describes the approach that makes possible creation of the steady-state ultracold plasma having various densities and temperatures by means of continuous two-step optical excitation of 40Ca atoms in the MOT. A strongly coupled ultracold plasma can be used as an excellent test platform for studying many-body interactions associated with various plasma phenomena. The parameters of the plasma are studied using laser-induced fluorescence of calcium ions. The strongly coupled plasma with the peak ion density of 2.7X106  cm-3 and the minimum electron temperature near 2K has been prepared. The experimental setup for laser cooling of 40Ca atoms enables the capture of approximately 3X107  atoms in the trap. Spectra of Rydberg transitions in n1S0 states were recorded for n ranging from 40 to 120. The energies of these transitions allowed for the determination of the most precise value of the ionization potential, which is 49305.91966(4) cm-1 compared to known data. A sensitive diagnostic method for sparse ultracold plasma, based on the autoionization effect of Rydberg states of 40Ca atoms, has been developed. This method enables the detection of plasma with ion concentrations of up to 103  cm-3, roughly equivalent to an electric field intensity of  10-2  V/m. Physics bldg. 202, Seminar hall 303 Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Physics bldg. 202, Seminar hall 303
Abstract

Experimental study of ultracold 40Ca plasma

This work describes the approach that makes possible creation of the steady-state ultracold plasma having various densities and temperatures by means of continuous two-step optical excitation of 40Ca atoms in the MOT. A strongly coupled ultracold plasma can be used as an excellent test platform for studying many-body interactions associated with various plasma phenomena. The parameters of the plasma are studied using laser-induced fluorescence of calcium ions. The strongly coupled plasma with the peak ion density of 2.7X106  cm-3 and the minimum electron temperature near 2K has been prepared. The experimental setup for laser cooling of 40Ca atoms enables the capture of approximately 3X107  atoms in the trap. Spectra of Rydberg transitions in n1S0 states were recorded for n ranging from 40 to 120. The energies of these transitions allowed for the determination of the most precise value of the ionization potential, which is 49305.91966(4) cm-1 compared to known data. A sensitive diagnostic method for sparse ultracold plasma, based on the autoionization effect of Rydberg states of 40Ca atoms, has been developed. This method enables the detection of plasma with ion concentrations of up to 103  cm-3, roughly equivalent to an electric field intensity of  10-2  V/m.

Last Updated Date : 28/01/2024