学科分类
/ 11
202 个结果
  • 简介:TheprecursoryprojectofADSprotonlinearacceleratoristhedevicetoprovideintenseprotonbeamsfortheentiretransmutationsystem,whichhasthefiguresofintensebeamandhighenergy.Asaresult,acontinuousdeflectedbeamwithacertainintensitywoulddeclinetheperformanceoftheacceleratordevicesorevenmakedamageswithin20s.Inordertopreventthiskindofproblem,anintegratemachineprotectionsystemwithfunctionsofstatemonitoringandtimelybeamcuttingisrequiredtoprotectacceleratordevices.

  • 标签:
  • 简介:Spallationtargetrepresentsoneofthemostchallengingcomponentsinacceleratordrivensystems(ADS)sinceitisthecomponentcouplingtheacceleratorandthesub-criticalcore.Itissubjectedtobombardmentofintenseprotonbeamandveryhighthermalloadinastrongradiationfield.TheirradiatedLBEtargetposesseverehandlingproblemsforthemaintenancestaffandotherscientistsduetoitsresidualactivity[1].ToassistthedesignofADS,thegeneralradiologicalsafetyaspectsoflead,lead-bismutheutectic(LBE)andtungstenspallationtargetwerestudiedwithMCNPX2.7code[2].Thespallationtargetwasirradiatedbya250MeV,10mAprotonbeamproducedbyalinearprotonaccelerator.Theneutronyield,neutronspectrum,residualproductionandtimeevolutionfortheirradiatedtargetwereanalyzed.

  • 标签: Designed China ADS
  • 简介:Twocompactandintense2.45GHzpermanentprotonsourcesandtheircorrespondinglowenergybeamtransport(LEBT)systemsweredevelopedsuccessfullyforChinaAcceleratorDrivenSub-criticalsystem(C-ADS)in2014,oneofwhichwasbuiltatIMP,LanzhouandtheotheratIHEP,Beijing.Bothprotonsourcescandeliverstable10mA/35keVprotonbeamsatCWmodetotheentrancesofthedownstreamRFQs.AsshowninFig.1,thebeamsextractedbya3-electrodeextractionsystemaretransportedbytheLEBTsystem,whichiscomposedof2identicalsolenoids,andintothe3.2or2.1MeVradio-frequencyquadrupole(RFQ).Inordertoensuresuperconductingcavitiescommissioningandprotection,anelectrostatic-chopperhasbeendesignedandinstalledintheLEBTlinethatcanchopthecwbeamFig.2Totalhydrogenionbeamcurrentversusinputpower.intoapulsedone.Theachievedfall/risetimeofthechopperislessthan20ns.

  • 标签: STATUS INTENSE PROTON
  • 简介:PhasescanapplicationisveryimportantsoftwareforADSLinacbeamtuning.Thescan/measuretoolsinOpenXALwasusedpreviously.Inordertoimprovethescanningefficiency,anewphasescanapplicationwasdeveloped.ThePythonwasselectedastheprogramminglanguagetomakethedevelopmenteasier.

  • 标签: PHASE SCAN APPLICATION
  • 简介:隐藏的对称和一个无限的集合广告5S5上的格林Schwarz超弦的非局部的保存水流被Bena等指出了。在这篇论文,我们证明在MaurerCartan方程和运动的方程之间双的农夫在格林Schwarz超弦的moduli空格给隐藏的对称。因此由扭曲的转变vielbeins,我们能表示纸的水流[我。Bena,J。Polchinski,和R。Roiban,Phys。加快。D69(2004)046002]作为宽松的连接由一唯一光谱参数。

  • 标签: 超粒子 Hodge对偶 隐藏对称 分子物理学
  • 简介:为实现无人机高精度高可靠性导航,提出了一种以捷联惯性导航系统(SINS)为主,以地形辅助导航(TAN)、大气数据系统(ADS)及电子磁罗盘(MCP)为辅的组合导航方式。通过分析SINS、TAN、ADS及MCP单一系统的工作原理及输出误差模型,构建了SINS/TAN、SINS/ADS及SINS/MCP系统的状态方程及观测方程,最后采用联邦卡尔曼滤波方式实现了对各组合系统的信息融合。仿真数据对比表明:SINS/TAN系统位置误差较小,但航向误差较大;SINS/ADS系统速度误差较小且比较稳定,但位置误差随时间发散;SINS/MCP系统航向误差方差可达0.3783’,但其位置和速度估计精度不理想;而SINS/TAN/ADS/MCP系统能够克服上述不足,实现所有导航参数误差估计的高精度。

  • 标签: 无人机 组合导航 联邦卡尔曼滤波 信息融合
  • 简介:UsingtheefectiveHamiltonianmethod,weanalyzetheB0-ˉB0mixingintheextensionofthestandardmodel(SM)wherebaryonnumberandleptonnumberarelocalgaugesymmetries.ThenumericalresultsindicatethecorrectionfromtheextraparticlestothemassdiferencemBissignificant.Thereisa60%enhancementcomparedtotheSMpredictionformBatmost,whichagreeswiththecurrentexperimentalresult.

  • 标签: 重子数 混合 轻子 有效哈密顿方法 标准模型 计算结果
  • 简介:Thefeaturesofthelow-lyingspectraoffour-bodyA+B-A+B-systemshavebeendeducedbasedonsymmetry.Usingthemethodoffew-bodyphysics,wecalculatetheenergyspectraofA+B-A+B-systemsinaharmonicquantumdot.Wefindthatthebiexcitoninatwo-dimensionalquantumdotmayhaveotherboundexcitedstatesandthequantummechanicalsymmetryplaysacrucialroleindeterminingtheenergylevelsandstructuresofthelow-lyingstates.

  • 标签: 多体问题 A^+B^-A^+B^-库仑系统 二维量子斑
  • 简介:

  • 标签:
  • 简介:从电子在电磁场中的狄拉克方程出发,得出电子在电磁场中波函数,分析磁矢热A引起的电子概率波的相移,结果表明:影响电子波函数的相位变化不是B而是A(x),即有一个额外相因子附加在电子概率波上,进而通过量子干涉出现图样的位移。结论是A—B效应的存在说明磁场的物理效应不能完全用B描述,而是附加在电子概率波上的相因子。

  • 标签: A—B效应 相位
  • 简介:

  • 标签:
  • 简介:提出了点集Bézier曲线的概念,给出了点集Bézier曲线的性质及细分算法.按照点集算术的定义,当点集是长方形闭域或圆盘时,点集Bézier曲线就是区间Bézier曲线或圆盘Bézier曲线,因此,点集Bézier曲线是对区间Bézier曲线和圆盘Bézier曲线的推广.

  • 标签: 点集算术 点集Bézier曲线 紧盘