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Observation of E×B Flow Velocity Profile Change Using Doppler Reflectometry in HL-2A

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Chinese Physics Letters 2009年第3期26卷 159-162页

作者：肖维文邹晓岚丁玄同董家齐刘泽田宋绍栋高亚东姚良骅冯北滨宋显明陈程远孙红娟李永高杨青巍严龙文刘仪段旭如潘传红刘永 Southwestern Institute of Physics PO Box 432 Chengdu 610041 association euratom-cea CEA/DSM/IRFM CEA/Cadarache 13018 St Paul-les-Durance France

A broadband, O-mode sweeping Doppler reflectometry designed for measuring plasma E×B flow velocity profiles is operated in HL-2A. The main feature of the Doppler reflectometry is its capability to be tuned to any selected frequency in total waveband from 26-40 GHz. This property enables us to probe several plasma layers within a short time interval during a discharge, permitting the characterization of the radial distribution of plasma fluctuations. The system allows us to extract important information about the velocity change layer, namely its spatial localization. In purely Ohmic discharge a change of the E×B flow velocity profiles has been observed in the region for 28 〈 r 〈 30cm if only the line average density exceeds 2.2×10^19 m^-3. The density gradient change is measured in the same region, too.

关键词： DOPPLER effect PLASMA (Ionized gases) GAS flow TOKAMAKS GLOW discharges BROADBAND communication systems

A New Method for Measurement of Helium Mass Flow Rate in the Cryogenic System of TORE SUPRA

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Plasma Science and Technology 2005年第3期7卷 2825-2827页

作者：欧阳峥嵘 Pascal Reynaud Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China Centre d'Etude de Cadarache association euratom-cea sur la fusion Département de Recherches sur la Fusion Contr(o|^)lée 13108 Saint Paul-Lez-Durance France

The TORE SUPRA Tokamak was built by euratom-cea association. The NbTi conductor of superconducting coils is inserted in a tight enclosure filled with pressurized superfluid helium of 0.125 MPa at 1.8 K. The thick casing is cooled to 4.5 K by 1.8 MPa in 4.5 K supercritical helium circulation. Around this thick casing, a 80 K thermal shield protects the parts at very low temperatures from the thermal radiation, which is cooled by pressurized helium at 80 K and 1.8 MPa. A new measurement method for helium mass flow rate of 80 K shield and 4.5 K casing is described in this paper. The commissioning was done on the two helium loops of the cryoplant: the supercritical 4.5 K thick casing and 80 K shields. The purpose is to improve control of the 4.5 K and 80 K refrigeration loops.

关键词： mass flow rate valve measurement helium

Numerical investigation of spallation neutrons generated from petawatt-scale laser-driven proton beams

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Matter and Radiation at Extremes 2022年第2期7卷 8-17页

作者： B.Martinez S.N.Chen S.Bolaños N.Blanchot G.Boutoux W.Cayzac C.Courtois X.Davoine A.Duval V.Horny I.Lantuejoul L.Le Deroff P.E.Masson-Laborde G.Sary B.Vauzour R.Smets L.Gremillet J.Fuchs LULI-CNRS CEAUPMC Univ Paris 06:Sorbonne UniversitéEcole PolytechniqueInstitut Polytechnique de ParisF-91128 Palaiseau CedexFrance cea DAMDIFF-91297 ArpajonFrance Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-MagureleRomania cea DAMCESTAF-33114 Le BarpFrance UniversitéParis-Saclay CEALMCE91680 Bruyères-le-ChâtelFrance LPP Sorbonne UniversitéCNRSEcole PolytechniqueF-91128 Palaiseau CedexFrance

Laser-driven neutron sources could offer a promising alternative to those based on conventional accelerator technologies in delivering compact beams of high brightness and short *** examine this through particle-in-cell and Monte Carlo simulations that model,respectively,the laser acceleration of protons from thin-foil targets and their subsequent conversion into neutrons in secondary lead *** parameters relevant to the 0.5 PW LMJ-PETAL and 0.6–6 PW Apollon systems are *** to its high intensity,the 20-fs-duration 0.6 PW Apollon laser is expected to accelerate protons up to above 100MeV,thereby unlocking efficient neutron generation via spallation *** a result,despite a 30-fold lower pulse energy than the LMJ-PETAL laser,the 0.6 PW Apollon laser should perform comparably well both in terms of neutron yield and ***,we predict that very compact neutron pulses,of∼10 ps duration and∼100μm spot size,can be released provided the lead convertor target is thin enough(∼100μm).These sources are characterized by extreme fluxes,of the order of 10^(23) n cm^(−2) s^(−1),and even ten times higher when using the 6 PW Apollon *** values surpass those currently achievable at large-scale accelerator-based neutron sources(∼10^(16) n cm^(−2) s^(−1)),or reported from previous laser experiments using low-Z converters(∼10^(18) n cm^(−2) s^(−1)).By showing that such laser systems can produce neutron pulses significantly brighter than existing sources,our findings open a path toward attractive novel applications,such as flash neutron radiography and laboratory studies of heavy-ion nucleosynthesis.

关键词： thereby attractive extreme

Pellet Injectors Developed at the Pelin Laboratory for Steady-State Plasma Fuelling

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Plasma Science and Technology 2004年第3期6卷 2286-2290页

作者： I.Vinyar A.Geraud H.Yamada R.Sakamoto Y.Oda A.Lukin A.Umov S.Skoblikov G.Gros G.Saksaganskii P.Reznichenko I.Krasilnikov V.Panchenko PELIN Laboratory Ltd. 2 Admiral Makarov St. Moscow 125212 Russia association euratom-cea Departement de Recherches sur la Fusion Controllee CEA/Cadarache 13108 St Paul Lez Durance France National Institute for Fusion Science 322-6 Oroshi-cho Toki-shi 509-5292 Japan Mitsubishi Heavy Industries Ltd. 1-1 Wadasaki-cho 1-Chome Hyogo-ku Kobe-shi 652-8585 Japan D. V. Efremov Scientific Research Institute of Electrophysical Apparatus St. Petersburg 196641 Russia

Pneumatic and centrifugal injectors for steady-state plasma refuelling bysolid hydrogen, deuterium and tritium pellets have been designed at the PELIN Laboratory to meetrequirements of LHD, TORE SUPRA, and ITER. Prese... 详细信息

关键词： pellet plasma fuelling

Enhanced ion acceleration using the high-energy petawatt PETAL laser

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Matter and Radiation at Extremes 2021年第5期6卷 62-79页

作者： D.Raffestin L.Lecherbourg I.Lantúejoul B.Vauzour P.E.Masson-Laborde X.Davoine N.Blanchot J.L.Dubois X.Vaisseau E.d’Humières L.Gremillet A.Duval Ch.Reverdin B.Rosse G.Boutoux J.E.Ducret Ch.Rousseaux V.Tikhonchuk D.Batani cea DAMCESTAF-33116 Le BarpFrance Centre Laser Intenses et Applications Universit´e de Bordeaux-CNRS-CEAUMR 510733405 TalenceFrance cea DAMDIFF-91297 ArpajonFrance Universit´e Paris-Saclay CEALMCE91680 Bruy`eres-le-ChˆatelFrance cea DRFIRFUGANILF-14000 CaenFrance ELI-Beamlines Research Centre 25241 DolníBrezanyCzech Republic

The high-energy petawatt PETAL laser system was commissioned at cea’s Laser M´egajoule facility during the 2017–2018 *** paper reports in detail on the first experimental results obtained at PETAL on energetic particle and photon generation from solid foil targets,with special emphasis on proton *** a moderately relativistic(<1019 W/cm^(2))laser intensity,proton energies as high as 51 MeV have been measured significantly above those expected from preliminary numerical simulations using idealized interaction *** hydrodynamic and kinetic simulations,taking into account the actual laser parameters,show the importance of the energetic electron production in the extended low-density preplasma created by the laser *** hot-electron generation occurs through two main pathways:(i)stimulated backscattering of the incoming laser light,triggering stochastic electron heating in the resulting counterpropagating laser beams;(ii)laser filamentation,leading to local intensifications of the laser field and plasma channeling,both of which tend to boost the electron ***,owing to the large(∼100μm)waist and picosecond duration of the PETAL beam,the hot electrons can sustain a high electrostatic field at the target rear side for an extended period,thus enabling efficient target normal sheath acceleration of the rear-side *** particle distributions predicted by our numerical simulations are consistent with the measurements.

关键词： acceleration high energy

Optimization of performance of the KM2A full array using the Crab Nebula

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Chinese Physics C 2024年第6期48卷 169-178页

作者：曹臻 F.Aharonian 安琪阿西克古白云翔包逸炜 D.Bastieri 毕效军毕玉江蔡金庭曹晴曹文羽曹喆常进常劲帆陈尚明陈恩生陈亮陈林陈龙陈明君陈玛丽陈起辉陈素弘陈天禄陈阳程宁程耀东崔明阳崔树旺崔晓红崔昱东戴本忠代洪亮戴子高单增罗布 D.della Volpe 董绪强段凯凯樊军辉范一中方军方堃冯存峰封莉冯少辉丰晓婷冯有亮 S.Gabici 高博高川东高林青高启高卫高伟康葛茂茂耿利斯 G.Giacinti 龚光华苟全补顾旻皓郭福来郭晓磊郭义庆郭莹莹韩毅昂何会海贺昊宁何佳银何新波何钰 M.Heller 贺远强侯博文侯超侯贤胡红波胡铨胡世聪黄代绘黄天奇黄文俊黄性涛黄晓渊黄勇黄志成季筱璐贾焕玉贾康江琨姜晓巍姜泽军金敏康明铭柯通 D.Kuleshov.K.Kurinov 李兵兵李澄李骢李丹李飞李海波李会财李华阳李军李剑李捷李凯李文龙李文莲李秀荣李昕李一卓李哲黎卓梁恩维梁云峰林苏杰刘冰刘成刘栋刘虎刘海东刘佳刘江来刘金艳刘茂元柳若愚刘四明刘伟刘怡刘以农鲁睿罗晴吕洪魁马伯强马玲玲马欣华毛基荣闵振 W.Mitthumsiri 穆慧君南云程 A.Neronov 区子维庞彬宇 P.Pattarakijwanich 裴致远齐孟尧祁业情乔冰强秦家军 D.Ruffolo A.Sáiz D.Semikoz 邵澄宇邵琅 O.Shchegolev 盛祥东舒富文宋慧超 Yu.V.Stenkin V.Stepanov 苏扬孙秦宁孙晓娜孙志斌谭柏轩唐庆文唐泽波田文武王超王昌贝王广威王洪光王惠惠王建成汪凯王利苹王玲玉王培汉王冉王为王祥高王祥玉王阳王玉东王岩谨王忠海王仲翔王振王铮韦大明魏俊杰魏永健文韬吴超勇吴含荣武莎吴雪峰吴雨生席邵强夏捷夏君集项光漫肖迪泫肖刚辛广广辛玉良邢祎熊峥徐东莲徐仁峰徐仁新徐伟立薛良闫大海颜景志颜田杨朝文杨帆杨冯帆杨何文杨佳盈杨莉莉杨明洁杨睿智杨深邦姚玉华姚志国叶一锰尹丽巧尹娜游晓浩游智勇于艳红袁强岳华曾厚敦曾婷轩曾玮查敏张彬彬张丰张海明张恒英张建立张丽霞张力张鹏飞张佩佩张瑞张少博张少如张寿山张潇张笑鹏张云峰张毅张勇赵兵赵静赵雷赵立志赵世平郑福周斌周浩周佳能周猛周平周荣周勋秀祝成光祝凤荣朱辉朱科军左雄 LHAASO Collaboration Key Laboratory of Particle Astrophyics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Tianfu Cosmic Ray Research Center Chengdu 610000China Dublin Institute for Advanced Studies 31 Fitzwilliam Place2 DublinIreland Max-Planck-Institut for Nuclear Physics P.O.Box 10398069029 HeidelbergGermany State Key Laboratory of Particle Detection and Electronics China University of Science and Technology of China Hefei 230026China School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Hebei Normal University Shijiazhuang 050024China Key Laboratory of Dark Matter and Space Astronomy&Key Laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000TibetChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Physics and Astronomy(Zhuhai)&School of Physics(Guangzhou)&Sino-French Institute of Nuclear Engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275China School of Physics and Astronomy Yunnan UniversityKunming 650091China Département de Physique Nucléaire et Corpusculaire Facultéde SciencesUniversitéde Genève24 Quai Ernest Ansermet1211 GenevaSwitzerland Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China APC Universit'e Paris Cit'eCNRS/IN2P3CEA/IRFUObservat

The full array of the Large High Altitude Air Shower Observatory(LHAASO)has been in operation since July *** its kilometer-square array(KM2A),we optimized the selection criteria for very high and ultrahigh energyγ-rays using data collected from August 2021 to August 2022,resulting in an improvement in significance of the detection in the Crab Nebula of approximately 15%,compared with that of previous *** the implementation of these new selection criteria,the angular resolution was also significantly improved by approximately 10%at tens of *** aspects of the full KM2A array performance,such as the pointing error,were also calibrated using the Crab *** resulting energy spectrum of the Crab Nebula in the energy range of 10-1000 TeV are well fitted by a log-parabola model,which is consistent with the previous results from LHAASO and other experiments.

关键词： γ-ray Crab Nebula significance

Orf1/SpcS Chaperones ExoS for Type Three Secretion by Pseudomonas aeruginosa

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Biomedical and Environmental Sciences 2008年第2期21卷 103-109页

作者： DA-KANG SHEN LAURIANE QUENEE MARIETTE BONNET LAURIANE KUHN MADIHA DEROUAZI DANIELE LAMOTTE BERTRAND TOUSSAINT BENOIT POLACK Groupe de Recherche et d'Etude du Processus Inflammatoire (GREPI) MENRT EA 2938 Centre Hospitalier Universitaire de Grenoble BP 217 38043 Grenoble Cedex 9 France Laboratoire de Chimie des Protéines DRDC CEA Grenoble 38054 Grenoble France

Objective Pseudomonas aeruginosa is a ubiquitous and opportunistic pathogen that uses the type Ⅲ secretion system （TTSS） to inject effector proteins directly into the cytosol of target cells to subvert the host cell＇s functions. Specialized bacterial chaperones are required for effective secretion of some effectors. To identify the chaperone of ExoS, the representative effector secreted by the TTSS of P aeruginosa, we analyzed the role of a postulated chaperone termed Orfl. Methods By allelic exchange, we constructed the mutant with the deletion of gene Orfl. Analysis of secreted and cell-associated fractions was performed by SDS-PAGE and Western blotting. Using strain expressing in trans Orfl, tagged by V5 polypeptide and histidine, protein-protein interaction was determined by affinity resin pull-down assay in combination with MALDI-TOF The role of Orfl in the expression of exoS was evaluated by gene reporter analysis. Results Pull-down assay showed that Orfl binds to ExoS and ExoT. Secretion profile analysis showed that Orfl was necessary for the optimal secretion of ExoS and ExoT. However, Orfl had no effect on the expression of exoS. Conclusion Orfl is important for the secretion of ExoS probably by maintaining ExoS in a secretion-competent conformation. We propose to name Orfl as SpcS for ＂specific Pseudomonas chaperone for ExoS＂.

关键词： Type Ⅲ secretion system Pseudomonas aeruginosa Chaperone

Rapid and Convenient Disaster Information Collection Platform for Earthquake

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Electromagnetic Anomalies around Wenchuan Earthquake and Their Relationship with Earthquake Preparation

2011 International Conference on Computers, Communications, Control and Automation

作者： Tao Zhang Xiang Cheng Tao Bo Xueshan Yang Vibration Instrument Laboratory Institute of Engineering Mechanics CEA Network Information Centre Institute of Engineering Mechanics CEA Emergency Support Centre Earthquake Administration of Beijing Municipality

This article discusses and describes a set of convenient survey equipment which is programmed by java and based on the smart phone. It can be used for seismic disaster information recording and other disasters. Working with the remote server, we can componentized a entire system which is used to transport and process the information of *** system can improve the efficiency, standardization and accuracy during the survey for disaster.

关键词： seismic disaster information collection smart phones remote server wireless communications

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Electromagnetic Anomalies around Wenchuan Earthquake and The...