an erl-based amplifier in the jlab upgrade一种基于erl在jlab升级放大器

《an erl-based amplifier in the jlab upgrade一种基于erl在jlab升级放大器》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、JLAB-TN-06-0458November2006AnERL-BasedAmplifierFELUsingtheJLabIRUpgradeDriverK.Jordan,D.Douglas,S.Benson,andG.NeilAbstractWepresentapre-conceptualdesignforanamplifier-basedFELintheJLabUpgradeDriver.BackgroundTherehasbeenconsiderablecommunityinterestintestinganERL-drivenamplif

2、ier-basedFEL.Itisthereforenaturaltoconsiderhowsuchastudycouldbeperformedintheonlyexistinghigh-powerERL–theJLabUpgradeDriver.Wenotethatthecriticalelectronbeamparametersforsuchasystem–singlebunchemittanceandpeakcurrent–willconstraineitherorbothoftheselectionofwigglerand/orthepe

3、rformanceofthelaser.WehavedeterminedthattheBNLNISUSwigglerisintendedforoperationwithelectronbeamsinglebunchpropertiesverysimilartothoseproducedintheJLabUpgrade[1],andhavethereforedevelopedscenariosunderwhichtheNISUSwigglercouldbeoperatedinawell-optimizedmannerintheUpgradeDriv

4、er.ScenariosItisimmediatelyobviousthattheUpgradeDriverUVbypass[2]providesamplespacefortheinstallationandoperationofawigglerwithalengthofuptoatleast10m.ThisiscompatiblewithuseoftheNISUSwiggler.Moreover,theexistingUVend-candesignswouldallow–byleavingapairofmirror(HRandOC)slotsb

5、lank–injectionofaseedlaserbeamandextractionoftheamplifiedbeamusingnothingmorethantheUVopticaltransportsystem.Theonlyimplicationsofamplifierinstallationwouldthenbea)thepotentialinstallationofaseedlaser,wereonetobeusedandb)somemodificationoftheUVbacklegaxiselectronbeamtransport

6、.AsthetransitionfromtheOK20opticalklystrontotheW80wiggler,andthesubsequenttransitiontotheW55wigglerhaveshownintheIRFELinsertionoftheDriver,suchrearrangementspresentfewfundamentalchallenges(thoughonemustnotforgetthedevilsresidinginthedetails).Asanamplifierwouldostensiblybeimmu

7、netotheTHzheatingeffectsthathaveprovenachallengewithopticalcavities,thereisnoneedforaTHzsuppressionchicane[3]downstreamofthewiggler.ThisallowstheuseofthepreexistingUVtransportdesign[4]upstreamofthewiggler,meaningthat–atleastinprinciple,theonlymodificationsneededtoswitchbetwee

8、nanoptical-cavitybasedUVFELandanamplifierFELwouldbeinstallationofthe