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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Reflection <strong>and</strong> Transmission Coefficents<br />
10 0<br />
10 0<br />
2 5 10 1<br />
2 5 10 2<br />
2 5 10 3<br />
2 5 10 4<br />
Wavenumber (cm -1 10<br />
)<br />
-2<br />
10<br />
5<br />
2<br />
-1<br />
5 R[E ||] wg<br />
2<br />
R[Ek]wgisthereectioncoecientofthewiregridfortheelectriceldcomponentparalleltothe<br />
T[E] gc<br />
TheenergyspectrumcanbederivedbyFouriertransformingtheautocorrelationdeducedfromthe wires,<strong>and</strong>T[E]gcisthetransmissioncoecientoftheGolaycellentrancewindow. wires,R[E?]wgisthereectioncoecientofthewiregridforthecomponentperpendiculartothe Figure5.13:LimitationofsomeopticalcomponentsintheMichelsonpolarizinginterferometer.<br />
R[E ] wg<br />
data.SincetheFouriertransformofasampledfunctionwithsamplingintervaltisa1=t-periodic FastFourierTransformalgorithm(FFT)[47]becauseofthesamplednatureoftheexperimental interferogram.However,wecannotperformanexactFouriertransform<strong>and</strong>havetousest<strong>and</strong>ard function,thefrequencyresolutionwillbeoftheorderof1=(2Nt)ifNisthenumberofsamplings 5.5.5ExperimentalResultsUsinganAutocorrelationTechnique acquired.Againnotethatt==cisrelatedtotheOPD<strong>and</strong>therefore,foraninterferogram acquiredwithmirrorstepsof,thefrequencyspectrumresolutionis1=(4N). ArstsetofmeasurementswasperformedintheperiodpriorrstlasingoftheIRFEL.Typically,it wasfoundthattheGolaycellcouldeasilydetect,withafairlygoodsignalovernoise,thecoherent transitionradiationpowergeneratedastheelectronbeamwasinlowdutycyclemode(theso-called tune-upmode);signalswithamplitudeoftheorderof1Vwereseeninthiscase.
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