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用于反氢原子高精度兰姆位移光谱学的微波光谱仪设计。

Design of a microwave spectrometer for high-precision Lamb shift spectroscopy of antihydrogen atoms.

作者信息

Tanaka T A, Blumer P, Janka G, Ohayon B, Regenfus C, Asari M, Tsukida R, Higuchi T, Tanaka K S, Crivelli P, Kuroda N

机构信息

Institute of Physics, The University of Tokyo, Komaba, Meguro-ku, 153-8902 Tokyo Japan.

Institute for Particle Physics and Astrophysics, ETH Zürich, Otto-Stern-Weg, Zürich, 8093 Switzerland.

出版信息

Interactions (Cham). 2024;245(1):30. doi: 10.1007/s10751-024-01876-3. Epub 2024 Mar 1.

DOI:10.1007/s10751-024-01876-3
PMID:39619620
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11604687/
Abstract

We have developed a microwave spectrometer for a measurement of the Lamb shift of antihydrogen atoms towards the determination of the antiproton charge radius. The spectrometer consists of two consecutive apparatuses, of which the first apparatus, (HFS), filters out hyperfine states and pre-selects the state, and the second apparatus, (MWS), sweeps the frequency around the target transition to obtain the spectrum. We optimized the geometry of the apparatuses by evaluating the S-parameter that represents the ratio of the reflected microwave signal over the input, utilizing microwave simulations based on the finite element method. The HFS was designed to obtain a resonant property at 1.1 GHz for an efficient removal of the hyperfine states, and the MWS was designed to realize weak frequency-dependency in the signal reflection. Also, the spatial distributions of microwave electric field were simulated. We report the design of the spectrometer and discuss an expected precision of the first measurement.

摘要

我们开发了一种微波光谱仪，用于测量反氢原子的兰姆位移，以确定反质子电荷半径。该光谱仪由两个连续的装置组成，其中第一个装置（HFS）滤除超精细态并预选特定态，第二个装置（MWS）在目标跃迁频率附近扫描以获取光谱。我们通过评估表示反射微波信号与输入信号之比的S参数，利用基于有限元方法的微波模拟来优化装置的几何结构。HFS被设计为在1.1 GHz处获得共振特性，以便有效去除特定超精细态，MWS被设计为在信号反射中实现弱频率依赖性。此外，还模拟了微波电场的空间分布。我们报告了光谱仪的设计，并讨论了首次测量的预期精度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/3ea23b090832/10751_2024_1876_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/9b7392c4afc2/10751_2024_1876_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/e5c5b8f08b26/10751_2024_1876_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/ec72651534c0/10751_2024_1876_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/275efb15cb99/10751_2024_1876_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/5c146f597d55/10751_2024_1876_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/9cf5fa58b2e7/10751_2024_1876_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/70766f2a46aa/10751_2024_1876_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/daf7e09f8372/10751_2024_1876_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/3ea23b090832/10751_2024_1876_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/9b7392c4afc2/10751_2024_1876_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/e5c5b8f08b26/10751_2024_1876_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/ec72651534c0/10751_2024_1876_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/275efb15cb99/10751_2024_1876_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/5c146f597d55/10751_2024_1876_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/9cf5fa58b2e7/10751_2024_1876_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/70766f2a46aa/10751_2024_1876_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/daf7e09f8372/10751_2024_1876_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f592/11604687/3ea23b090832/10751_2024_1876_Fig10_HTML.jpg

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CODATA recommended values of the fundamental physical constants: 2018.国际科学技术数据委员会（CODATA）推荐的基本物理常数数值：2018年版
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Nat Commun. 2022 Nov 25;13(1):7273. doi: 10.1038/s41467-022-34672-0.
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Precision Measurement of the Lamb Shift in Muonium.缪子中兰姆位移的精确测量。
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Eur Phys J C Part Fields. 2020;80(9):804. doi: 10.1140/epjc/s10052-020-8400-1. Epub 2020 Sep 1.
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