简介:ThreesynchrotronradiationbeamlineshavebeenbuiltonDAΦNE,theFrascatielectron-positronaccelerator.ItisPossibletomonitorandcontrolalltheelementsonthebeamlinesusingamodularnetworkdistributedI/OsystembyNationalInstrunments(FieldPoint)withBridgeVIEW/LabVIEWprograms,Twoofthesebeamlineshaveradiationsafetyproblemssolvedbytwoindependentandredundantsystems,usingmechanicalswitches,andS7-200PLC'sbySiemens.Inthisarticleoursolutionwillbedescribedindetails.
简介:TheparametricoptimizationoftheNe-CuBrUVlaserexcitedbylongitudinalpulseddischargeisanalysedbyusingaself-consistentkineticmodel.Consistentcharacteristicsoftheoptimizationprocessareobtainedbycomparingwiththeexperimentalresults.Simulationresultsshowthatneonionscomeintobeingalongwithconsiderabledepletionoftheground-statecopperatoms.Andtheoptimizationofthedischargetubediameteristhetradeoffbetweenthespecificoutputphotondensityandthetotalactivevolume.Boththeoptimalneongaspressureandtheoptimalreservoirtemperatureresultfromthebalancebetweentheneoniondensityandtheground-statecopperatomdensitytoarriveatamaximumoftheirproduct.
简介:Multi-nucleontransferreactionplaysanimportantroleinthesynthesisofnewnuclides[1].Inthereactionsof20Ne+209Bi,someshort-livednucleiproducedbytransferring26nucleonswerediscovered.Theexperimentof20Ne+209Biwasperformedatgas-filledrecoilseparatorinLanzhou[2].A400g/cm2thick209Bitargetwasbombardedwith20NebeamdeliveredbyacceleratorHIRFL.