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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To Linac entrance<br />
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Figure3.1:Dispersedoverviewofthemainringofthedriveracceleratorcorrespondingtog-<br />
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Quadrupole<br />
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Sextupole<br />
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ure2.11.Thepathoftheelectronbeamisindicatedwitharrows.<br />
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Quadrupole<br />
Sextupole<br />
180 deg<br />
dipole<br />
Reinjection Line<br />
180 deg<br />
dipole<br />
Sextupole<br />
Quadrupole<br />
Sextupole<br />
Quadrupole<br />
To Backleg To Arc 2 (5F)<br />
innitelylongwigglerw=w=(2p2K),withwthewigglerperiod<strong>and</strong>Ktheundulator thebetatronfunctionsarematchedtothewiggler\natural"betatronfunctioneigenvalueofan insuresthebeamlatticefunctionsareproperlymatchedtothedesiredvalueattheundulatorcenter.<br />
parameter(seeChapter2).The\upstream"by-passchicaneprovidefurtherlongitudinalphase Thisregionconsistsoftwoquadrupoletelescopesdisposedupstream<strong>and</strong>downstreamanachromatic chicane.Thetelescopesconsisteachofthreequadrupoles.Thesetwotelescopesprovidesixfree whileinsuringthebeamsizecanstillbecontainedwithinthevacuumchamberwithacceptablylow particlelossviascraping.The-functionsaresupposedtobezeroatthewigglercenterwhereas parameters(thestrengthofthequadrupoles)toadjustthefourTwissparameters(x,y,x,y)<br />
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Afterthewiggler,twoadditionaltelescopeseachcomposedofquadrupoletripletsareusedtomatch theopticallatticefunctionstothedesiredvaluesattheinjectionpoint.Longitudinally,further spacerotationbecauseofitsnonisochronicity(momentumcompaction1R56=28cm).<br />
whereitisdenedastheratioofrelativepathlengthchangeforarelativeenergychange=L=L transportformalism.Thisdenitionisdierentfromtheusualdenition(generallyforclosedorbitaccelerator) phasespacerotationisprovidedbythe\downstream"by-passchicanewhichisidenticaltothe upstreamchicane. Therecirculationloopiscomposedoftwoarcslinkedbyastraightlinesection,termed\backleg" 1ThroughoutthisreportthemomentumcompactionisdenedasthetransfermatrixelementR56=z E=EE=Einthe<br />
Sextupole<br />
Quadrupole<br />
Sextupole<br />
Quadrupole<br />
first Telescope<br />
To dump<br />
Fourth Telescope<br />
To Arc 1 (3F)<br />
SRF Linac<br />
<strong>Beam</strong> Direction<br />
Third Telescope<br />
Undulator Magnet<br />
Second Telescope<br />
<strong>Beam</strong> from Injector<br />
Quadrupole<br />
Sextupole<br />
Quadrupole<br />
Sextupole
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