|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effects of interstitial H and/or C atoms on the magnetic and magnetocaloric properties of La(Fe, Si)_(13)-based compounds显示文摘La(Fe,Si)13-based compounds have been considered as promising candidates for magnetic refrigerants particularly near room temperature.Herein we review recent progress particularly in the study of the effects of interstitial H and/or C atoms on the magnetic and magnetocaloric properties of La(Fe,Si)13compounds.By introducing H and/or C atoms,the Curie temperature TC increases notably with the increase of lattice expansion which makes the Fe 3d band narrow and reduces the overlap of the Fe 3d wave functions.The first-order itinerant-electron metamagnetic transition is conserved and the MCE still remains high after hydrogen absorption.In contrast,the characteristic of magnetic transition varies from first-order to second-order with the increase of C concentration,which leads to remarkable reduction of thermal and magnetic hysteresis.In addition,the introduction of interstitial C atoms promotes the formation of NaZn13-type(1:13)phase in La(Fe,Si)13compounds,and thus reducing the annealing time significantly from 40 days for LaFe11.7Si1.3to a week for LaFe11.7Si1.3C0.2.The pre-occupied interstitial C atoms may depress the rate of hydrogen absorption and release,which is favorable to the accurate control of hydrogen content.It is found that the reduction of particle size would greatly depress the hysteresis loss and improve the hydrogenation process.By the incorporation of both H and C atoms,large MCE without hysteresis loss can be obtained in La(Fe,Si)13compounds around room temperature,for instance,La0.7Pr0.3Fe11.5Si1.5C0.2H1.2exhibits a large|SM|of 22.1 J/(kg·K)at TC=321 K without hysteresis loss for a field change of 0 5 T. | ZHANG Hu HU FengXia SUN JiRong SHEN BaoGen | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，12： | 6 |
| 2 | Beam Measurement System in NSRL显示文摘This paper describes the beam measurement system for the accelerator of the National Synchrotron Radiation Laboratory (NSRL). The design considerations of the beam measurement instrumentation system for the NSRL are aided by the commissioning of the machine and provide sufficient machine parameters for machine study as well as the common operation. The beam measurement system includes the part for the linac and transport line and the part for the storage ring. The measurement results are presented in the paper. | Sun, Baogen Lu, Ping Wang, Junhua Fang, Zhigao Liu, Jianhong | 2000 | Journal of Systems Engineering and Electronics2000，11，3： | 4 |
| 3 | Design of S-band re-entrant cavity BPM显示文摘An S-band cavity BPM is designed for a new injector for HLS (Hefei Light Source). It consists of two cavities that work on 2448 MHz: a re-entrant position cavity tuned to TM110 mode and a reference cavity tuned to TM010 mode. Cut-through waveguides are used as pickups to suppress the monopole signal. Simulations with different assumption of dimension change are performed to evaluate errors caused by mechanical error and give general tolerance. Design of electronics is given. Theoretical resolution of this design is 31 nm. | LUO Qing SUN Baogen HE Duohui | 2009 | Nuclear Science and Techniques2009，20，3： | 4 |
| 4 | HLS bunch current measurement system显示文摘Bunch current is an important parameter for studying the injection fill-pattern in the storage ring and the instability threshold of the bunch, and the bunch current monitor also is an indispensable tool for the top-up injection. A bunch current measurement (BCM) system has been developed to meet the needs of the upgrade project of Hefei Light Source (HLS). This paper presents the layout of the BCM system. The system based on a high-speed digital oscilloscope can be used to measure the bunch current and synchronous phase shift. To obtain the absolute value of bunch-by-bunch current, the calibration coefficient is measured and analyzed. Error analysis shows that the RMS of bunch current is less than 0.01 mA when bunch current is about 5 mA, which can meet project requirement. | YANG YongLiang MA TianJi SUN BaoGen LU Ping WANG JiGang ZOU JunYing TANG LeiLei | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 3 |
| 5 | Development and application of the new BPM system data processing program at Hefei light source显示文摘A data processing program has been applied for the new beam position monitor (BPM) system of the storage ring at Hefei Light Source (HLS). The new BPM system in the upgrade project will be equipped with Libera Brilliance BPM processors to replace the old Bergoz MX-BPM processors. The embedded Linux system on Libera has completed some important work, including instrument status check,data acquisition, position calculation, EPICS IOC data release,and so on. A new EPICS record type has been developed to recalculate the beam position with log-ratio method. The property of the new position data was analyzed in the time and frequency domain. The results show that the rms value of beam position measurement resolution can be up to submicron. Preliminary studies have been carried out on the measurement of the tune and the beam lifetime with this new BPM system. | MA Tianji YANG Yongliang SUN Baogen ZOU Junying LU Ping ZHOU Zeran XU Hongliang | 2012 | Nuclear Science and Techniques2012，23，5： | 2 |
| 6 | The measurement of electron beam transverse sizes by synchrotron radiation interferometry for HLS Ⅱ显示文摘In order to improve accuracy of electron beam transverse sizes measurement,the vertical and horizontal synchrotron radiation light interferometers have been designed to measure beam transverse sizes for the upgrade project of Hefei Light Source(HLS II).In this paper,the light intensity distributions of the interferogram are descussed,and parameters of the interferometers are optimized.The interferograms are simulated under MATLAB. Taking integrations of two-dimensional interferogram intensity,normalized one-dimensional interference intensities distribution of the vertical and horizontal interferogram are obtained.The two curves are fitted to compare the beam transverse sizes with the designed sizes,and this verifies the feasibility of this method.Finally,several factors that affect the beam sizes measurement are discussed. | TANG Leilei SUN Baogen LU Ping WANG Jigang XIAO Yunyun | 2012 | Nuclear Science and Techniques2012，23，4： | 2 |
| 7 | 显示文摘 | Hu Fengxia Shen Baogen Sun Jirong | 2000 | Appl Phys Lett2000，76，： | 1 |
| 8 | 显示文摘 | Hu Fengxia Shen Baogen sun jirong | 2001 | Appl Phys Lett2001，78，23： | 1 |
| 9 | Research and measurement of synchrotron radiation system for HLS显示文摘 | Sun Baogen Wang Baoyun Wang Jigang | 2008 | Chinese Physics C2008，32，1： | 1 |
| 10 | Measurement and analysis of movement of BPM vacuum chamber for HLS显示文摘 | Cao Yong Sun Baogen He Duohui | 2008 | Chinese Physics C2008，32，1： | 1 |
| 11 | Beam emittance investigation in high brightness injector using different driver laser profiles显示文摘Beam emittance plays an important role in any accelerator, and it is a main parameter to judge the performance of an accelerator. Emittance optimization is an indispensable part in conditioning and operation of the facility. For a laser-driven high brightness injector, different time structure of the laser pulse has different effects on transverse emittance. In order to compare Gaussian and flat-top laser pulse, systematic simulations of 500 pC have been done. From the simulation results, one can see that flat-top pulse laser will yield smaller minimal transverse beam size and transverse beam emittance than Gaussian pulse laser. | WANG XiaoHui SUN BaoGen LUO Qing | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 1 |
| 12 | Development of photon beam position feedback system based on two PBPMs at HLS显示文摘In this paper,in order to stabilize the position and angle of the light source point,a new photon beam position feedback system based on the Photon Beam Position Monitors was developed on Hefei Light Source,and used to correct the position drift and angle variation of the light source at the same time.On introducing the feedback principle,the transfer function matrix is calibrated,indicating that the new system is workable and effective. | GU Liming SUN Baogen XUAN Ke YANG Yongliang LU Ping ZHOU Zeran CHENG Chaocai XU Hongliang | 2013 | Nuclear Science and Techniques2013，24，2： | 1 |
| 13 | Design and cold test of S-BAND cavity BPM for HLS显示文摘An S-band cavity BPM is designed for a new injector in National Synchrotron Radiation Laboratory. A re-entrant position cavity is tuned to the TM110 mode as position cavity. Cut-through waveguides are used as pickups to suppress the monopole signal. Theoretical resolution of this design is 31 nm. A prototype cavity BPM system is manufactured for off-line cold tests. The wire scanning method is used to calibrate the BPM and estimate the performance of the on-line BPM system. A cross-talk problem has been detected during the cold test. Racetrack cavity BPM design can be used to suppress the cross-talk. With the nonlinear effect being ignored, transform matrix can be used to correct cross-talk. Analysis of cold test results shows that the position resolution of prototype BPM is better than 3 μm. | LUO Qing SUN BaoGen JIA QiKa HE DuoHui FANG Jia | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 1 |
| 14 | Applied Physics Letters显示文摘 | Hu Fengxia Shen Baogen Sun Jirong | 2002 | 80(5): 8262002，80，5： | 1 |
| 15 | Advanced Materials 显示文摘 | Shen Baogen Sun Jirong Hu Fengxia | 2009 | 21(45): 45452009，21，45： | 1 |
| 16 | Journal of Physics: Condensed Matter显示文摘 | Hu Fengxia Shen Baogen Sun Jirong | 2000 | 12: 6912000，12，： | 1 |
| 17 | Neutron Diffraction Studies of the Magnetic Structure of Ho_2Fe_9Ga_(8~x)Alx | Chen Dongfeng Gou Cheng Sun Kai China Institute of Atomic Energy,P.O.Box 275-30,Beijing 102413Yan Qiwei Zhang Panlin Shen Baogen Cheng Zhaohua State Key Laboratory of Magnetism,Intstitute of Physics,the Chinese Academy of Sciences,P.O.Box 603,Beijing 100080 | 1997 | Chinese journal of nuclear physics1997，，1： | 0 |
| 18 | Major parameter measurement of high-brightness injector in Hefei Light Source显示文摘A photocathode radio frequency gun,which is an S-band normal conducting 1.6 copper cell cavity with water cooling system,was installed in Hefei Light Source.In order to know its characteristics and get it into normal operation,continuous conditioning was conducted in the last few months.Beam charge and dark current charge were measured using integrating current transformer.The beam transverse size was determined as 1.63 mm in minimum using YAG screen and GigE Vision camera.Using multi-slits technique,the transverse emittance was measured and normalized at 1.95 mm·mrad with beam charge of 240 pC.The results provide a way to optimize the facility. | WANG Xiaohui HE Zhigang SUN Baogen JIA Qika | 2011 | Nuclear Science and Techniques2011，22，4： | 0 |
| 19 | Magnetic Field Induced Entropy Change for La-Fe Based NaZn_(13)-Typed Compounds显示文摘Magnetic field induced entropy change was investigated for La-Fe based NaZn13-type compounds with magnetic first-order phase transition. In view of magnetic refrigeration at room temperature, the developing of the materials and the understanding of the entropy change were reviewed. For La-Fe-Si compounds, the entropy change about 29 J·kg-1·K-1 was obtained at 190 K under the magnetic field of 5 T. While a large entropy change of about 15 J·kg-1·K-1 near room temperature under 5 T can be obtained by the substitution of Co for Fe in the compounds. It is found that the entropy change is mainly composed of that contributed from magnetic ordering and crystal lattice. The large entropy change consumed by lattice contribution is mainly due to the magnetic ordering one. | Zhang Hongwei Sun Jirong Hu Fengxia Wang Fang Shen Baogen | 2005 | Journal of Rare Earths2005，23，4： | 0 |
| 20 | Relationship Between Magnetic Field-Induced Entropy Change and Magnetic Field显示文摘The ingots with the composition of LaFe13-xSix(1.2 | Dong Qiaoyan Zhang Hongwei Shen Juelian Sun Jirong He Shuli Shen Baogen | 2005 | Journal of Rare Earths2005，23，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员