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A...Vistaprint...company....For.the.high-speed.switching.arc-discharge.tube,.see.Krytron..The.energy.of.the.electron.beam.amplifies.the.signal,.and.the.amplified.signal.is.taken.from.a.cavity.at.the.other.end.of.the.tube..Electrons.entering.when.the.entrance.grid.is.negative.and.the.exit.grid.is.positive.encounter.an.electric.field.in.the.same.direction.as.their.motion,.and.are.accelerated.by.the.field..To.reinforce.the.bunching,.a.klystron.may.contain.additional."buncher".cavities..Then...the...beam...passes...through...a...second...undulator,...in...which...the...electron...bunches...cause...oscillation...to...create...a...second,...more...powerful...light...beam.[8]....Its..length..is..chosen..to..allow..maximum..bunching..at..the..resonant..frequency,..and..may..be..several..feet..long...An..electronic..oscillator..can..be..made..from..a..klystron..tube,..by..providing..a..feedback..path..from..output..to..input..by..connecting..the.."catcher"..and.."buncher"..cavities..with..a..coaxial..cable..or..waveguide...

At..SLAC,..for..example,..klystrons..are..routinely..employed..which..have..outputs..in..the..range..of..50MW..(pulse)..and..50kW..(time-averaged)..at..2856MHz...^.Campbell,.D..The..formation..of..electron..bunches..takes..place..in..the..drift..space..between..the..reflector..and..the..cavity...Unsourced..material..may..be..challenged..and..removed...The..amount..of..tuning..in..this..manner..is..not..large..and..is..normally..used..for..frequency..modulation..when..transmitting...1999-2002:...869899....The..cavity..resonator..from..which..the..output..is..taken,..is..attached..to..the..electrodes..labeled..Externer..Resonator...The..spent..electron..beam,..with..reduced..energy,..is..captured..by..a..collector..electrode...

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