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简介：Depositionoftwo-dimensional（2D）MoS2materialsonthetaperedfiberallowsvariousphotonicapplicationsincludingsaturableabsorbersandfour-wavemixing.Ethanolcatalyticdeposition（ECD）ofMoS2ontheopticaltaperedfiberwasproposedanddemonstratedinthiswork.Differentfromtheconventionalopticaldrivendepositionusingwaterororganicsolvent,theECDmethodutilizedthehighvolatilityoftheethanolsolvent,whichsignificantlyincreasedthemovementspeedoftheMoS2nanosheetsandthusboostedthedepositionrateandreducedtheminimumpowerthresholdtodrivethedeposition.WebelievetheECDmethodshouldbeabletobeappliedtoothersimilar2Dmaterialssuchasothertypesoftransitionmetalchalcogenides.

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简介：Theneutralgaspressurenearplasmaordivertorplatesisveryimportantfortheplasma-wallinteraction,whichdeterminetheoperationmodeofdivertomandconfinementperformancesofplasmaintokamaks.Thecommercialionizationgaugedoesnotworkinstrongmagneticfieldandnoisyenviromentencounteredintokamaks.Themeasuringerromofpressurecommercialionizationareverylargebythegaugemountedonthepumpingsystemorthroughalongpipetothevacuumvessel.Anewionizationgauge,

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简介：HL-2Aisatokamakwithcloseddivertor.Ithadbeenbuiltattheendof2002andbegantodischargefromthenon.TofurtherstudyplasmadischargesinHL-2A,afeedbackcontrolsystem(FBCS)forplasmapositionbadbeendevelopedin2003.

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简介：Impurity,whichisinducedbytheinteractionbetweenplasmaandthefirstwallsuchaslimiter,isoneofthekeyissuesimpactedthequalityoftokamakplasma.Itisalsothesourceoftheradiationandcoldelectronintokamak,andcanhaveasignificantinfluenceonthebalanceofplasmaenergyandparticleaswellastheprofilesofdensity,temperatureandcurrent.Thesteadystateoperationandtransportfeatureoftokamakplasmaareaffectedbyimpuritytoo.

简介：HL-2Aisadivertortokamakwithnoncircularplasmacross-section,itcanoperateinsingle-nullordouble-nullplasmadischarges.Thetoroidalandpoloidalcoils,vacuumvesselandsupportingstructureofHL-2AcomefromtheformerASDEX,Germany.

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简介：TheHL-2AtokamakisatokamakmodifiedfromtheoriginalshutdownGermanAS-DEXsothatitspoloidalmagneticsystemisthepreviousonewithparametersunchanged.However,thissystemmaypossiblyberedesignedinthefutureandnowdifferentoperationmodefromthepreviousASDEXonecanalsobeused(e.g.,tooperateinsinglenullmode),weneedtomasterthebasiccharacteristicsandfunctionsofthissystem.

简介：HL-2Atokamakwillbeequippedwitha75GHz/1MW/1sECRHsystem.Thepaperdescribesthedesignofthetransmissionsystem(Fig.1),whichismadeupwithatransmissionline,anequatoriallauncher.Thepaperdescribesthedesignofmaincomponentsofthesystemsuchas,waveguides,ellipsoidalsurfacemirrors,achemicalvapor(CVD)diamondwindow,asteeringmirror.

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简介：Cavitationisoneofthetroublesomeproblemsinrocketturbopumps,andsincemostofhigh-efficiencyrocketpropellantsarecryogenicfluids,socalled'thermodynamiceffect'becomesmoreevidentthaninwater.Inthepresentstudy.numericalandexperimentalstudyofliquidnitrogencavitationin2DLavalnozzlewascarriedout,sothattheinfluenceofthermodynamiceffectwasexamined.Itwasrevealedthattemperatureandcavitationhavestronginter-relationshipwitheachotherinthermo-sensitivecryogenicfluids.

简介：Basedonthesecond-ordermoments,thispaperderivesananalyticalexpressionoftheM2factoroffour-petalGaussianbeam.TheresultsshowthattheM2factorisonlydeterminedbythebeamordern.Thecorrespondingnumericalcalculationsarealsogiven.Asthebeamorderincreases,theaugmentofM2factorisdisciplinary.AstheexpressionofM2factorisexpressedinseriesformandbecomesmorecomplicated,anewconciseformulaofM2factorisalsopresentedbyusingcurvefittingofnumericalcalculations.When3≤n≤200,themaximumerrorrateoffittingformulawillnotexceed2.6%andtheaverageerrorrateis0.28%.Thisresearchishelpfultotheapplicationsoffour-petalGaussianbeam.