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Layout and Functionality of Collimator System

Layout and Functionality of Collimator System. Purpose of the Collimator System Layout Sub-Systems Transversal/ Energy Collimation Fast Orbit Correction System Matching Sections Diagnostic Concept . Beam. Layout and Functionality of Collimator System.

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Layout and Functionality of Collimator System

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  1. Layout and Functionality of Collimator System Purpose of the Collimator System Layout Sub-Systems Transversal/ Energy Collimation Fast Orbit Correction System Matching SectionsDiagnostic Concept M. Körfer, DESY

  2. Beam Layout and Functionality of Collimator System Purpose: Protection of Permanent Magnet Undulator • transversal collimation  beam halo separation • energy collimation  dark current separation • TTF2 Design for high average beam power • 72 kW average beam power • 1 nC, 800 s, 9 MHz, 10 Hz, 1 GeV Collimator Scheme Design take into account: beam dynamics material science interaction of e- and collimator Energy & Transversal Collimation M. Körfer, DESY

  3. Layout and Functionality of Collimator System Additional Functionality : saves tunnel length by including a) fast orbit correction system and b) optics matching Experience of the TTF1 collimator 1) energy collimation needed  absorption of dark current 2) offset of collimator and undulator axis  secondary particle (mostly low energy photons !) escaping the absorber system should not hit the undulator M. Körfer, DESY

  4. Layout of Collimator System MATCH Bypass ECOL Beam Start: 143.35 m End: 166.11 m Total length: 22.76 m TCOL: 9.02 m ECOL: 6.95 m MATCH: 6.79 m Dipole: 3.5 ˚ horizontal Offset: 400 mm TCOL M. Körfer, DESY

  5. Diagnostic Concept Steerer Beam Toroid Dark Current OTR-Wire Dipole Collimator Kicker Quad+BPM ECOL TCOL MATCH M. Körfer, DESY

  6. Transverse Collimation TQA Copper Collimator total length: 500 mm mover support: hor./vert. position accuracy: 15 m Steerer TCOL TQA TCOL Kicker Bypass Dipole Kicker Steerer Beam TCOL • Copper versus Titanium: • better temperature conductivity • better electrical conductivity • better Collimator efficiency • less stress limit T=180º TQA Toroid DCM M. Körfer, DESY

  7. TDH ECOL Steerer TSB TQB+BPM Steerer TQB Beam ECOL TQB+BPM TSB Steerer ECOL due to quadrupoles TDH Energy Collimator ECOL  dispersive Section  at the endD = 0, D` = 0  Quadrupoles inbetween Dipoles  compensation of higher order dispersion by sextupoles  orbit at the undulator entrance independent of energy within 5% ECOL  400 mmbeam path offset avoids direct photon shower into the undulator M. Körfer, DESY

  8. TDH ECOL Steerer TSB TQB+BPM Steerer TQB Beam ECOL TQB+BPM TSB Steerer ECOL TDH CSR-Effect and Slice-Emittance Growth Collimator Dogleg Trafic 4 Input: l=50m n=2 mm mrad E=1.0 GeV Output: l=50m slice=2.2 mm mrad proj.=2.8 mm mrad E/Ecorr= 0.05 % M. Körfer, DESY

  9. Undulator Chamber Dark Current Module Collimation and Efficiency Collimator Aperture • Collimator Efficiency: • calculated with • gaussean beam profile • back scattering • secondary particle blue curve max. aperture at minimum energy bandwidth for R=2 mm (without interaction with pipe) capture particle M. Körfer, DESY

  10. Collimator Impact of wakefields at TTF2 100 mm a1 a2 Vacuum Pipe Conductivity a3 Material r[mm] rms @50m [kV/nC/m] stainless steel 17 12.2 copper 17 3.1 TESLA Cavity 39 9.6 z z[mm] a1[mm] a2[mm] a3[mm] rms[kV/nC] @ 50m 0 2 -- 17 153 200 2 4.5 17 113 • Consequence: • copper coated vacuum pipes • avoiding steps inside the pipes • Bellow RF-shielding reduction of uncorr. energy-spread by 50% Longitudinal Wakefields und Energy Spread M. Körfer, DESY

  11. Matching Section MATCH Optic Matching with downstream section Phasemonitor, Toroid, OTR Steerer Fast orbit correction system: H-Kicker >  3h V-Kicker >  2v at undulator entrance TQB+BPM Kicker TQB Beam Kicker Steerer TQB+BPM TQB Steerer M. Körfer, DESY

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