High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA
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walllossesviaJouleseecttherebyallowingtheoperatingofthecavitiesathighcontinuouswave (cw)gradient.Acomparisonoftheaveragepowerthatcanbeproducedbysuchsuperconduct- consideredthroughoutthisthesis,istousesuperconductingacceleratingcavitieswhichoerlow ouslyhighacceleratinggradient<strong>and</strong>highelectronbunchrepetitionrate.Hencethecommonlight sourcecanproducehighpeakpowerbecauseofthehighchargethatcanbestoredinabunch,but cannoteasilyproducehighaveragepowerlightneededbycertainapplicationsuchaspowerbeaming,micro-machining,etc...Analternativescheme,thathasbeenusedinthedriver-acceleratoringlinearaccelerators(e.g.theIRFELfromJeersonLab),withconventionalhighaveragepower cavitydirectlysupplementstheinputpowerprovidedbytheklystrontoacceleratehigheraverage alightsourceforindustrialapplication,iscosteciency.Thiscostismainlyimpactedbytheinput laser,<strong>and</strong>recentlyweachieved1.7kWexperimentally. Anotherconcernthathasarisen,especiallyinourprojectwherethemainmotivationistodevelop powerdem<strong>and</strong>toacceleratethebeam.Thisdem<strong>and</strong>wasreducedintheJLABIRFELbyrecir- sourcegenerallyused(e.g.excimer<strong>and</strong>carbonlasers)isdepictedinFigure1.1.Amaximumoutput<br />
currentelectronbeamforagivenbeamenergytherebyreducingthedem<strong>and</strong>oninputpowerfrom poweroftheorderof2kWcanbeexpectedfromtheJeersonLabsuperconductingfree-electron<br />
klystron. culating<strong>and</strong>deceleratingthebeamusingthesamelinac.Thedeceleration-inducedvoltageinthe<br />
Figure1.1:ComparisonoftheexpectedpoweroftheIRcwfree-electronlaserofJeersonLabwith commonhighaveragepowersource. ThesuperconductingFELthatservedasexperimentalplatformforthisthesisisdedicatedtostudy thepossibleapplicationofhigh-powercwFEL's.ItisaninfrareddemoFELcapableofprovidingcontinuousphotonbeamsintheinfraredspectrum(3m-6m)withhigh-averagepowerof thedriver-accelerator. Thedriver-acceleratorneedstoprovideahigh-brightness,ultra-shortbunch,lowtransverse-emittance, electronbeam.Becauseofthehigh-chargeconcentratedinthebunchofelectrons,eectsuchas<br />
technologiesrequiredforhigh-powerfree-electronlasersespeciallythebeamdynamicsaspectsin approximately1kW.ThoughthisFELisanuser-orientedfacility,itisalsodevotedtostudythe<br />
Laser Average Power (kW)<br />
2<br />
1<br />
0<br />
Excimers<br />
Alex<strong>and</strong>rite<br />
Nd:YAG<br />
IRFEL<br />
HF<br />
10 kW<br />
100 1000<br />
Wavelength (nm)<br />
10000<br />
CO 2
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