分类： 工程与技术科学 >> 计量学 分类： 工程与技术科学 >> 仪器仪表技术 提交时间： 2024-03-28
摘要： mainlyintroducesthedevelopmentandapplicationofharmonicpowermeteringtechnologyinChina sincethe 21stcentury.Withtheincreasingdemandfor harmonic powermeteringinthe powergrid,theintroductionofthe world’sfirstharmonicpowerdefinitionstandard,IEEE1459---2000,haspromotedthedevelopmentof harmonicpowermeteringtechnology.Thetextalsomentionstheelementsoftheapplicationanddevelopmentofharmonicenergymetering technology, includingtheexpansionofthescopeofharmonicpollutioninthepowergrid,theconfusionofharmonicenergy metering instrumentadopted by different users, and thenewtypeofharmonicenergymeteringtechnologyintroducedinthe world.Inaddition,thispaperalsointroducesthedomesticindependentdevelopmentofharmonicenergymeasurementtechnology, such as 0.2S level three-phase electricity meter,0.2S three-phase harmonic active energy metering seriesproducts,threephasewaveactiveenergymeteringproducts,andusingtheHilbertdigitalfilterandlowfrequencyfiltercalculationharmonicreactivepowermeteringchipdevelopmentofcutting-edgepracticaltechnology.Ingeneral,thispaper summarizesthedevelopment process,applicationstatusandfuturedevelopmentdirectionofharmonic power measurementtechnology in China, as well as the related technology and productachievements.
分类： 数学 >> 几何与拓扑 提交时间： 2023-02-22
摘要： In this paper, we give a complete classifification of harmonic and biharmon#2; ic Riemannian submersions : (R^3 , g_Sol) (N^2 , h) from Sol space into a surface by proving that there is neither harmonic nor biharmonic Riemann#2; ian submersion : (R^3 , g_Sol) (N^2 , h) from Sol space no matter what the base space (N2 , h) is. We also prove that a Riemannian submersion : (R^3 , g_Sol) (N^2 , h) from Sol space exists only when the base space is a hyperbolic space form.
分类： 工程与技术科学 >> 工程物理学 分类： 核科学技术 >> 粒子加速器 提交时间： 2023-12-13
摘要： The China Spallation Neutron Source (CSNS) upgrade project (CSNS-II) aims to enhance the beam power from 100 to 500 kW. A dual-harmonic accelerating method has been adopted to alleviate the stronger space-charge effect in rapid-cycling synchrotrons owing to the increased beam intensity. To satisfy the requirements of dual-harmonic acceleration, a new radiofrequency (RF) system based on a magnetic alloy-loaded cavity is proposed . This paper presents design considerations and experimental results regarding the performance evaluation of the proposed RF system through high-power tests and beam commissioning. The test results demonstrate that the RF system satisfies the desired specifications and affords significant benefits for CSNS-II .
分类： 核科学技术 >> 粒子加速器 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
摘要： Hydrostatic leveling system (HLS) is widely used in precision engineering survey, especially the alignment of particle accelerator, and the tidal effects on the measurement accuracy of HLS is non-ignorable, thus studies on tidal effects on the HLS is vital. A set of HLS was installed in Jingxian seismostation for verifying the methods to handle the tidal effects on the readings of HLS. Harmonic analysis of the data recorded by HLS and DSQ water tube clinometers in Jingxian seismostation and contrastive analysis of the results are completed. The tilt tide can be well reflected in the data of the both instruments and the results are both reliable. The reasons of the difference between the results are analyzed in this paper. Besides, a validation study based on the measurement data of the HLS used in SPring-8 storage ring for tidal correction on the reading of HLS is completed. The research establishes a foundation for HLS to be applied in micron-level precision alignment of particle accelerator in the future.
分类： 物理学 >> 核物理学 提交时间： 2025-02-28
摘要： The Rapid Cycling Synchrotron (RCS) is a crucial device for proton beam acceleration at China SpallationNeutron Source, operating at a repetition frequency of 25 Hz. And now the beam power has increased from 100kW to 140 kW. The increase in beam power makes the on-orbit beam more sensitive to disturbances in variouslinks and parts of the accelerator, also including RCS magnet power supply system. This paper aims to presenta method for reducing the high-order harmonic current error in the resonant power supplies for dipole magnets,as well as to examine its impact on the horizontal orbit offset of the beam. It adopts a control scheme combininghigh order harmonic current compensation and a PI double-loop control on the resonant power supply. Byutilizing the existing digital controller hardware in the RCS power supply system, this paper demonstrateshow to achieve precise control of the 50 Hz harmonic current output in a cost-effective manner. Ultimately, itenhances performance, reducing the current error by up to 50%, and provides methodological support for futureupgrades of the power supply system. Such improvements are beneficial for enhancing the stability of the RCS,which reduces the beam horizontal orbit deviation down to 19.8% at least.
分类： 物理学 >> 核物理学 提交时间： 2024-12-10
Tian, Dr. Qili
Gao, Dr. Qiang
Liu, Dr. Xing
Lu, Dr. Xinyi
Wang, Mr. Huan
Song, Dr. Zexin
You, Mr. Jingjing
Chi, Dr. Zhijun
Yan, Prof. Lixin
Du, Prof. Ying-Chao 杜应超
shi, Dr. jiaru 施佳儒
Li, Prof. Renkai
Huang, Prof. Wenhui
Tang, Dr. Chuanxiang
摘要： With the development of high-brightness electron beams and chirped pulse amplification technology, the inverse Compton scattering (ICS) X/γ-ray have the characteristics of compactness, quasi-monochromatic, continuous energy tunability, and high photon energy. The application of ultra-fast laser technology has improved the temporal resolution, brightness and spectral control capabilities of the X/γ-ray. In this paper, we present the design and implementation of the laser system for the very compact inverse Compton scattering γ-ray source (VIGAS). The laser system consists of a photo-injector driving laser system and a scattering laser system. The photo injector driving laser system produces an ultraviolet (UV) pulses with 0.58 mJ pulse energy, 7.2 ps (FWHM) pulse width, and 10 Hz repetition rate at a central wavelength of 267 nm, which illuminates a photocathode to generate a high-quality electron beam. The ICS laser system produces two alternative ultrashort laser pulses with a central wavelength of 800 nm and 400 nm, respectively, to interact with the electron beam. An intense second harmonic (SH) laser with 0.5 J pulse energy is achieved experimentally by passing a TW Ti:sapphire laser pulse through a 0.59-mm KDP crystal. We obtain a uniform SH laser focal intensity distribution through wavefront correction by a deformable mirror.
分类： 动力与电气工程 >> 工程热物理学 提交时间： 2017-06-26 合作期刊: 《热科学学报》
摘要： In view of some of the characteristics of a high-medium pressure gas regulator, such as small fault samples, many fault types and complex fault features etc, in order to improve the accuracy of fault precaution in this paper, a fault diagnosis method based on the combination of the improved wavelet packet and pressure harmonic distortion rate is proposed. On the basis of the harmonic distortion rate of the outlet pressure and the energy value of each frequency band obtained by improved wavelet packet decomposition, the rules for fault data were summarized. Finally, a safety precaution model of the high-medium pressure gas regulator is established.
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