Speaker
Description
The online commissioning experiments of CLaSsy, a Collinear Laser Spectroscopy setup at RAON, were conducted at the end of 2024 with KNUE and CENS collaborators, observing the optical D1 and D2 transitions for sodium isotopes ($^{21}Na$, $^{22}Na$ and $^{23}Na$). The isotopes were provided in the form of bunched beams with a repetition rate of 10 Hz using the Radio Frequency Quadrupole-Cooler Buncher (RFQ-CB) at the ISOL facility at RAON. The collinear and anti-collinear geometries were alternately employed to measure the fluorescence spectra as a function of the acceleration voltage of the post accelerator. As a result, the input ion beam energy was precisely measured from Doppler shifts of the two spectra in different geometries. The kinematic compression of Doppler broadening at ~20 keV beam energy provided a sufficient spectral resolution to observe the hyperfine structure of the $^2S_{1/2}$ ground state and the $^2P_{1/2}$ excited state, whereas the resolution for the hyperfine splitting of the $^2P_{2/3}$ excited state was limited. To improve the spectroscopic resolution, a high-resolution laser spectroscopy with two independent laser beams in a combined collinear and anti-collinear geometry has been under development. In this talk, we present the commissioning results and an outlook on future experiments of CLaSsy.
| Email address | songjh8975@ibs.re.kr |
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| Classification | Instrumentation for radioactive ion beam experiments |
