Sympathetic cooling of 9 Be + by 88 Sr + Doppler cooled ions in large Coulomb crystals: an experimental study

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(1)Sympathetic cooling of 9 Be + by 88 Sr + Doppler cooled ions in large Coulomb crystals: an experimental study A Douillet, B Wirtschafter, J.-P Likforman, S Guibal, V Tugayé, N Sillitoe, J Heinrich, T Louvradoux, J.-P Karr, L Hilico, et al.. To cite this version: A Douillet, B Wirtschafter, J.-P Likforman, S Guibal, V Tugayé, et al.. Sympathetic cooling of 9 Be + by 88 Sr + Doppler cooled ions in large Coulomb crystals: an experimental study. North American Conference on Trapped Ions (NACTI), Aug 2017, Boulder (Co), United States. �hal-03205364�. HAL Id: hal-03205364 https://hal.archives-ouvertes.fr/hal-03205364 Submitted on 22 Apr 2021. HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés..

(2) 9. +. 88. +. Sympathetic cooling of Be by Sr Doppler cooled ions in large Coulomb crystals: an experimental study 2. 1. 1. 1. 1. 2. A. Douillet , B. Wirtschafter , J.-P. Likforman , S. Guibal ,V. Tugayé , N. Sillitoe , 2 2 2 2 1 J. Heinrich , T. Louvradoux , J.-P.. Karr , L. Hilico , and L. Guidoni 1. Laboratoire Matériaux et Phénomènes Quantiques, Université Paris-Diderot, Sorbonne Paris Cité, CNRS, F-75013 Paris, France 2 Laboratoire LKB, UPMC-Université Paris 6, ENS, CNRS, Collège de France F-75005 Paris and Université d’Evry-Val d’Essonne, F-91000 Evry, France. Motivation. Trap features. sympathetic cooling of light species by heavy coolants - precision molecular spectroscopy J. C. J. Koelemeij et al., Phys. Rev. Lett. 98, 173002 (2007). J. Biesheuvel et al., Nature Comm., 7, 10385 (2016). macroscopic trap - multicharged ions L. Schmoger et al., Science, 347, 1233 (2015). - GBAR experiment P. Perez and Y. Sacquin, Classical and Quantum Gravity, 29, 18 (2012). Sympathetic cooling of Sr+ isotopes. - inner radius R = 3.4 mm - length Zl = 30 mm - radio-frequency 7.6 MHz - amplitudes VRF 50 - 800 V. - experiments test for molecular dynamics simulations N. Sillitoe et al., arXiv:1705.03347 [physics.comp-ph]. - axial motional frequency (88Sr+): 10 - 30 kHz - typical stability parameter (88Sr+) q < 0.005. Experimental setup Doppler cooling of Sr. Sr+ cooling lasers and stabilization. +. EC Laser Diode 422nm. 88. Be photo-ionization. Fiber laser 1092nm. Sr photo-ionization. Ti:Sa. 80 MHz 100 fs 5 nJ (500 mW) @ 940nm. 275 THz (1091.7 nm). Saturated Absorbtion 85 Rb 5s1/2- 6p1/2. 711 THz (421.6 nm). EC Laser Diode 461nm. 500 µm BiBO single pass. Saturated Absorbtion 85 Rb 5s1/2- 6p1/2. Laser Diode 405nm. 1 nJ (100 mW) @ 470nm. transfer lock cavity. Frequency-doubled Ti:Sa laser 422nm. beat note. Photoionization of Sr. 9. 500 µm BBO single pass. optical fiber. Photoionization of Be. 0.07 nJ (7 mW) @ 235nm. Vacuum chamber. Be+ probing laser. s s e r g. DBR Laser Diode 626nm AOM. AOM. Ionization threshold. 235nm 405nm. Paul Trap. Injection locked Laser Diode 626nm. o W. 2p 1P1 235nm. 461nm. doubling cavity. 2s 1S0. AOM. AOM. CCD/PM. i rk. o r p n. F. M. J. Cozijn et al., Opt. Lett. 38, 2370 (2013). =1. Laser coolingon 200 Sr+, - Gamma, 1.5 saturation. r0 =3 mm, RF 7MHz, 100 V, q=0.0125, DC 10 mV, 100 kHz axial pour M=1 et Q=1. Laser coolingon 200 Sr+, - Gamma, 1.5 saturation r0 =3 mm, RF 7MHz, 100 V, q=0.0125, DC 10 mV, 100 kHz axial pour M=1 et Q=1. Laser coolingon 200 Sr+, - Gamma, 1.5 saturation. Preliminary results. numerical simulations of steady-state. Next steps 88. Sr+ isotope selection. pure Sr+ N=200. Sr+ initial crystal. N=200 Sr+ ; N=100 Be+. UV on, 3 min. probing 9Be+ for diagnostics. study of sympathetic cooling dynamics UV + Be oven on, 3 min N=200 Sr+ ; N=250 Be+. - qualitatively long (> 10 s) cooling dynamics - independent of loading order - tickle confirmation of mass ratio.

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