High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA High Brightness Electron Beam Diagnostics and their ... - CASA
500 450 400 350 300 250 200 150 100 50 0 0 100 200 300 400 500 600 500 450 400 350 300 250 200 150 100 50 Cavities Off Cavities -90 deg 0 0 100 200 300 400 500 600 0 500 200 180 450 160 400 350 140 300 120 250 100 200 80 150 60 100 40 ... . .. .. 50 20 0 0 0 100 200 300 400 500 600 ... .. . .. . .. . .. . . . ... .. . . . . . . .. .. . . ... ... . . .. . . . . .. .. .. . .. . ... ... ... . . .. . . .. .. ... . . . .. . . ... . .. . .. .. . .. . .. . .. . ... .. Figure5.27:Typicalzerophasingbasedmeasurement.The2Dfalsecolorimagerepresentsthe Cavities +90 deg 100 beamspotmeasuredonthedispersiveviewerinthespectrometerlinewhereastherightplotisthe 90 projectionontothehorizontalaxis.Measurementforthecasewhereallthe\zerophasing"cavities 80 areo(topline),arephased-90degw.r.t.themaximumaccelerationphase(middleline)andare 70 phased+90degw.r.t.themaximumaccelerationphase(bottomline). 60 50 40 30 .. 20 -20 -15 -10 -5 0 5 10 15 20 Distance (mm) Horizontal (energy) axis 40 mm 200 180 160 140 120 100 80 60 40 20 0 200 180 160 140 120 100 80 60 40 20 OTR intensity OTR intensity OTR intensity 100 . .. .... .. . . ... .. . . ... . . . . . . .. . .... .. . . .. . . .... . . . . . . ... . ... ..... . . .. .. . .. . . . .. . . . . . . .. . .. . . . .... . ... . .. . . .. . .. . .. ... . .. .. .. . . . . . . . .. 90 80 70 60 50 40 30 20 -20 -15 -10 -5 0 5 10 15 20 Distance (mm) 100 90 80 70 . .. . .. . .. . . ... . . .. . .. . . .. . . .. . . .. . ... ... . .. ... . .. . . . .. . .. . .. . . . .. . .. ..... .. . .. .. .. . .. .. . . .... . .. . .. .. .. . . ... 60 50 40 30 .. 20 -20 -15 -10 -5 0 5 10 15 20 Distance (mm) . .
σ x (m) x 10−3 5 4 3 2 1 0 0 5 10 15 20 1 0.8 0.6 0.4 0.2 0 5 10 15 20 Quadrupole Strength (m −2 7 6 5 0 5 10 15 20 1 0.98 0.96 0.94 0.92 0.9 0 5 10 15 20 ) Quadrupole Strength (m −2 and=2%(bottomright) beamsizecontributionduetodispersiononlywiththetotalbeamsizefor=0:2%(bottomleft) thebeamsizecontributionduetodispersiononly.Thebottomplotspresenttheratioofthe variationinthecenterofthebunchcompressorversustheexcitationofanupstreamquadrupole Figure5.28:Comparisonfor=0:2%(topleft)andfor=2%(topright)ofthebeamrmssize usingdimadsimulation(solidlines),usingEqn.(5.57)(crosses).Thedashedlineontheseplotsis ) Figure5.29:Schematicsoftheavailablediagnosticsintheundulatorregionformeasuringthe longitudinalemittance. Undulator Magnet OTR foil OTR foil e- beam from linac CTR foil Chicane 1 (Compressor) Chicane 2 (Decompressor) σ x (δ)/σ x (no units) x 10−3 10 9 8
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... .. Figure5.27:Typicalzerophasingbasedmeasurement.The2Dfalsecolorimagerepresentsthe<br />
Cavities +90 deg<br />
100<br />
beamspotmeasuredonthedispersiveviewerinthespectrometerlinewhereastherightplotisthe<br />
90<br />
projectionontothehorizontalaxis.Measurementforthecasewhereallthe\zerophasing"cavities<br />
80<br />
areo(topline),arephased-90degw.r.t.themaximumaccelerationphase(middleline)<strong>and</strong>are<br />
70<br />
phased+90degw.r.t.themaximumaccelerationphase(bottomline).<br />
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