Design and test of frequency tuner for a CAEP high power THz free-electron laser

米正辉,; 赵丹阳,; 孙毅,; 潘卫民,; 林海英,; 王光伟,; 戴建枰,; 李中泉,; 马强,; 沙鹏,; Mi, Zhiyong; Zhao, DY; Sun, Yipeng; Pan, Weimin; Lin, Hungyen; Xy, Lu; Quan, SW; Luo, Xing; Li, M; Yang, Xiaoping; Wang, GW; Dai, JP; Zq, Li; Ma, Qiang; Sha, Peng

doi:10.1088/1674-1137/39/2/028102

Cited by 2 publications

(1 citation statement)

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“…Constraining Galactic Dark Photons through Diurnal Modulation Analysis -We now embark on a search for the diurnal modulation of signals stemming from galactic dark photons, leveraging data from a previous DPDM search employing a single-cell elliptical niobium SRF cavity [32]. The cavity was equipped with a frequency tuning mechanism [79,80] and an amplifier circuit, and maintained in liquid helium at a temperature of approximately 2 K. The experimental platform [81][82][83][84][85][86] facilitated the calibration of relevant parameters, including the loaded quality factor Q L , coupling factor β, net amplification factor G net , and the resonant frequency of the TM 010 mode, centered around ω 0 ≈ 2π1.3 GHz, along with its stability range for each scanning process. Each scan step was approximately 5 minutes, with 100 seconds dedicated to data acquisi- In our analysis, only the received power at the resonant frequency bin with a bandwidth of 2π11.5 Hz [32], denoted by P i for the i-th step, was considered.…”

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confidence: 99%

TMD Studies and More with SoLID at JLab

Chen

2014

The 21st International Symposium on Spin Physics, Peking University, Beijing, China, Oct 20 – 24, 2014

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Diamond is a solid-state platform to develop quantum technologies, but it has been a long-standing problem that the current understanding of quantum states in diamond is mostly limited to single-electron pictures. Here, we combine the full configuration interaction quantum Monte Carlo method and the densitymatrix functional embedding theory, to achieve unprecedented accuracy in describing the many-body quantum states of nitrogen vacancy (NV) centers in diamond. More than 30 electrons and 130 molecular orbitals are correlated, which reveals the multi-configurational wavefunction of the many-body quantum states in diamond. The multi-configurational description explains puzzling experimental measurements in intersystem crossing and charge state transition in NV centers in diamond. The calculations not only reproduce the available experimental measurements of the energy gaps between quantum states but also provide new benchmarks for states that are still subject to considerable uncertainty. This study highlights the importance of multi-configurational wavefunction in the many-body quantum states in solids.

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confidence: 99%

TMD Studies and More with SoLID at JLab

Chen

2014

The 21st International Symposium on Spin Physics, Peking University, Beijing, China, Oct 20 – 24, 2014

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First Scan Search for Dark Photon Dark Matter with a Tunable Superconducting Radio-Frequency Cavity

Tang,

Wang,

Chen

et al. 2024

Phys. Rev. Lett.

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Dark photons have emerged as promising candidates for dark matter, and their search is a top priority in particle physics, astrophysics, and cosmology. We report the first use of a tunable niobium superconducting radio-frequency cavity for a scan search of dark photon dark matter with innovative data analysis techniques. We mechanically adjusted the resonant frequency of a cavity submerged in liquid helium at a temperature of 2 K, and scanned the dark photon mass over a frequency range of 1.37 MHz centered at 1.3 GHz. Our study leveraged the superconducting radio-frequency cavity’s remarkably high quality factors of approximately 1010, resulting in the most stringent constraints to date on a substantial portion of the exclusion parameter space on the kinetic mixing coefficient ε between dark photons and electromagnetic photons, yielding a value of ε<2.2×10−16. Published by the American Physical Society 2024

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Design and test of frequency tuner for a CAEP high power THz free-electron laser

Cited by 2 publications

References 4 publications

TMD Studies and More with SoLID at JLab

TMD Studies and More with SoLID at JLab

First Scan Search for Dark Photon Dark Matter with a Tunable Superconducting Radio-Frequency Cavity

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