Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session B04: Laser Cooling and Trapping I
10:45 AM–12:33 PM,
Tuesday, June 4, 2024
Room: 201BC
Chair: Bharath Madhusudhana, Los Alamos National Lab
Abstract: B04.00003 : Demonstration of one-dimensional chirp cooling of positronium*
11:09 AM–11:21 AM
Presenter:
Kenji Shu
(The University of Tokyo)
Authors:
Kenji Shu
(The University of Tokyo)
Yohei Tajima
(The University of Tokyo)
Ryosuke Uozumi
(The University of Tokyo)
Naoki Miyamoto
(The University of Tokyo)
Sohma Shiraishi
(The University of Tokyo)
Takuto Kobayashi
(The University of Tokyo)
Akira Ishida
(The University of Tokyo)
Kyohei Yamada
(The University of Tokyo)
Randall W Gladen
(The University of Tokyo)
Toshio Namba
(The University of Tokyo)
Shoji Asai
(The University of Tokyo)
Ken Wada
(High Energy Accelerator Research Organization (KEK))
Izumi Mochizuki
(High Energy Accelerator Research Organization (KEK))
Toshio Hyodo
(High Energy Accelerator Research Organization (KEK))
Kenji Ito
(National Institute of Advanced Industrial Science and Technology (AIST))
Koji Michishio
(National Institute of Advanced Industrial Science and Technology (AIST))
Brian E O'Rourke
(National Institute of Advanced Industrial Science and Technology (AIST))
Nagayasu Oshima
(National Institute of Advanced Industrial Science and Technology (AIST))
Kosuke Yoshioka
(The University of Tokyo)
However, the experimental accuracy and precision have been compromised by the challenges associated with cooling Ps. Traditional experiments typically deal with Ps atom clouds at several hundreds of Kelvin, introducing significant measurement uncertainties. Due to the short lifetime of approximately 142 ns for the spin-triplet ground state of Ps, rapid cooling is essential.
In this presentation, we demonstrate one-dimensional laser cooling of Ps down to approximately 1 K within 100 ns. This is accomplished using a chirp cooling scheme, which employs a laser pulse train with the center frequency shifting upwards at a rate of 0.5 GHz/ns to maintain resonance with the decelerating Ps atoms. Approximately 10% of the Ps atoms created was cooled successfully from the initial temperature of 600 K.
We will also present a comparison of the resultant Ps velocity distribution with simulations based on the Lindblad equation formalism. Furthermore, we will discuss the implications of this work for future precision spectroscopy studies.
*This study was supported by the MEXT Quantum Leap Flagship Program (MEXT QLEAP) Grant No. JPMXS0118067246, JST FOREST Program (Grant Number JPMJFR202L), JSPS KAKENHI Grant Numbers JP16H04526, JP17H02820, JP17H06205, JP17J03691, JP18H03855, JP19H01923, MATSUO FOUNDATION, Mitutoyo Association for Science and Technology (MAST), Research Foundation for Opto-Science and Technology, and Mitsubishi Foundation. This study used the Fugaku computational resources provided by the RIKEN Centre for Computational Science through the HPCI System Research Project (Project ID: hp230215).
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