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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x,y (mm)<br />
6.0<br />
4.8<br />
3.6<br />
2.4<br />
1.2<br />
x<br />
y<br />
0.0<br />
0 120 240 360 480 600 720 840 960 1080 1200<br />
6.0<br />
5.0<br />
4.0<br />
3.0<br />
2.0<br />
is350keV).<br />
1.0<br />
0 200 400 600 800 1000 1200<br />
Thissolenoid,thatwillbereferredhenceforthasthe\emittancesolenoid",becauseofitsimpact<br />
z (cm)<br />
onthebeamemittance,shouldbeoperatedwiththeoptimummagneticeldtominimizespace- Figure6.2:RMStransverse(x<strong>and</strong>y)<strong>and</strong>longitudinal(z)beamsizesalongtheinjector.The charge-inducedemittancegrowth<strong>and</strong>makesurethereisnobeamlossdownstreamduetoscraping onthevacuumchambers.Typicallytheoptimummagneticelddependsonthechargeperbunch bottomschematicslocatestheopticalelementsalongthebeamline(thegunacceleratingvoltage<br />
GUN BUNCHER CAV1 CAV4 QUAD1 QUAD4 DIP1<br />
DIP3<br />
solenoidarereferredasthebeamgenerationline1.Usually,thisregionisentirelysimulatedwith <strong>and</strong>electronenergy(i.e.acceleratingvoltageofthegun).Generallythegunalongwiththisrst<br />
SOL1 SOL2 CAV2 CAV3 QUAD3 QUAD2<br />
DIP2<br />
numericalmethods:themagnetostaticeld2Dmapinthegun<strong>and</strong>inthesolenoid2arecomputed withmagnetostaticsolvercodesuchaspoisson<strong>and</strong>parmelaisusedtosimulatephotoemission ofelectronmacroparticles<strong>and</strong>trackthemalongthisgenerationline. Inthefollowingwearegoingtoprovideanalyticdescriptionoftheevolutionofthebeamparameters alongthe350keVtransportbeamline.Thisanalyticdescriptionisbasedoncoupleddierential 1thisgenerationlineasbeenthesubjectofaPhDthesisseeReference[14] 2Thegun<strong>and</strong>thesolenoidarecylindricallysymmetricelements<br />
z (mm)
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