Current Issue
Research article21 Dec 2023
Millisecond dynamics of colloidal suspension studied by X-ray photon correlation spectroscopy at the Shanghai Synchrotron Radiation Facility
X-ray photon correlation spectroscopy (XPCS) has emerged as a powerful tool for probing the nanoscale dynamics of soft condensed matter and strongly correlated materials owing to its high spatial resolution and penetration capabilities. This technique requires high brilliance and beam coherence, which are not directly available at modern synchrotron beamlines in China. To facilitate future XPCS experiments, we modified the optical setup of the newly commissioned BL10U1 USAXS beamline at the Shanghai Synchrotron Radiation Facility (SSRF). Subsequently, we performed XPCS measurements on silica suspensions in glycerol, which were opaque owing to their high concentrations. Images were collected using a high frame rate area detector. A comprehensive analysis was performed, yielding correlation functions and several key dynamic parameters. All the results were consistent with the theory of Brownian motion and demonstrated the feasibility of XPCS at SSRF. Finally, by carefully optimizing the setup and analyzing the algorithms, we achieved a time resolution of 2 ms, which enabled the characterization of millisecond dynamics in opaque systems.
Chen‑Hui Cui, Zi‑Mu Zhou, Lin‑Feng Wei, Song‑Lin Li, Feng Tian, Xiu‑Hong Li, Zhi Guo, Yi‑Hui Xu, Huai‑Dong Jiang, Ren‑Zhong Tai
Research article21 Dec 2023
Infrared microspectroscopy beamline BL06B at SSRF
The infrared microspectroscopy beamline (BL06B) is a phase II beamline project at the Shanghai Synchrotron Radiation Facility (SSRF). The construction and optical alignment of BL06B were completed by the end of 2020. By 2021, it became accessible to users. The synchrotron radiation infrared (SRIR) source included edge radiation (ER) and bending-magnet radiation (BMR). The extracted angles in the horizontal and vertical directions were 40 and 20 mrad, respectively. The photon flux, spectral resolution, and focused spot size were measured at the BL06B end station, and the experimental results were consistent with theoretical calculations. SRIR light has a small divergence angle, high brightness, and a wide wavelength range. As a source of IR microscopy, it can easily focus on a diffraction-limited spatial resolution with a high signal-to-noise ratio (SNR). The BL06B end station can be applied in a wide range of research fields, including materials, chemistry, biology, geophysics, and pharmacology.
Te Ji, Hua-Chun Zhu, Wei-Wei Peng, Jie Wang, Hong-Wei Zhao, Ai-Guo Li, Min Chen
Research article22 Dec 2023
NνDEx-100 conceptual design report
Observing nuclear neutrinoless double beta (0vββ) decay would be a revolutionary result in particle physics. Observing such a decay would prove that the neutrinos are their own antiparticles, help to study the absolute mass of neutrinos, explore the origin of their mass, and may explain the matter-antimatter asymmetry in our universe by lepton number violation. We propose developing a time projection chamber (TPC) using high-pressure 82SeF6 gas and Topmetal silicon sensors for readout in the China Jinping Underground Laboratory (CJPL) to search for neutrinoless double beta decay of 82Se, called the Nv DEx experiment. Besides being located at CJPL with the world’s thickest rock shielding, Nv DEx combines the advantages of the high Qββ (2.996 MeV) of 82 Se and the TPC’s ability to distinguish signal and background events using their different topological characteristics. This makes N DEx unique, with great potential for low-background and high-sensitivity 0vββ searches. NvDEx-100, a NvDEx experiment phase with 100 kg of SeF6 gas, is being built, with plans to complete installation at CJPL by 2025. This report introduces 0vββ physics, the NvDEx concept and its advantages, and the schematic design of NvDEx-100, its subsystems, and background and sensitivity estimation.
Xi‑Guang Cao, Yan‑Long Chang, Kai Chen, Emilio Ciuffoli, Li‑Min Duan, Dong‑Liang Fang, Chao‑Song Gao, Surja K. Ghorui, Peng‑Chong Hu, Qiang Hu, Si‑Yuan Huang, Ze‑Yu Huang, Lei Lang, Yu‑Lan Li, Zhi‑Jie Li, Tian‑Yu Liang, Jun Liu, Chen‑Gui Lu, Fa‑Tai Mai, Yuan Mei, Hao Qiu, Xiang‑Ming Sun, Xiao‑Xing Tang, Hu‑Lin Wang, Qian‑Ming Wang, Le Xiao, Mu‑Yun Xiao, Jian‑Yu Xin, Nu Xu, Peng Yang, Yi‑Chen Yang, Zhen Yang, Zong‑Yang Yu, Dong‑Liang Zhang, Jun‑Wei Zhang, Cheng‑Xin Zhao, Dou Zhu
CURRENT ISSUE
Nuclear Science and TechniquesVol.35, No.1
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