Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 35: Poster VIII
A 35.3: Poster
Thursday, March 14, 2024, 17:00–19:00, Tent C
Characterization of electron-production efficiency in 40Ca two-step photoionization for loading electrons into a radiofrequency trap — •Natalija Sheth1, Vladimir Mikhailovskii1, Hendrik Bekker1, Guofeng Qu2, Yuzhe Zhang1, Ferdinand Schmidt-Kaler3, Christian Smorra3, and Dmitry Budker1,3,4 — 1Helmholtz-Institut Mainz, GSI Helmholtzzentrum für Schwerionenforschung, Mainz, Germany — 2Institute of Nuclear Science and Technology, Sichuan University, Chengdu, China — 3Johannes Gutenberg-Universität, Mainz, Germany — 4Department of Physics, University of California, Berkeley, USA
Radiofrequency (RF) traps are widely used for trapping ions, molecules, and even nanoparticles [1], while confining of electrons remains a challenging task. Within the AntiMatter On a Chip project we are characterizing an RF trap for electrons keeping in mind future possibility of trapping positrons.
Loading electrons into the RF trap is realized by two-step photoionization (PI) of neutral Ca atoms [2]: excitation 41S0 - 41P1 with a 423 nm laser, and ionization from 41P1 to continuum with a 393 nm laser. This approach allows production of cold electrons within the effective volume of the trap. A Ca atomic beam is produced by thermal evaporation of Ca. PI signal detection is realized by an electron-multiplier tube.
Dependence of the PI signal on the lasers power and the detection efficiency are discussed.
[1].D. Bykov, et al. Rev. Sci. Inst; 93 (7), 073201 (2022)
[2].S. Gulde, et al. Appl Phys B; 73, 861 (2001).
Keywords: Paul trap; Radiofrequency trap; electrons trapping; Ca photoionization; Antimatter production