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s x * Limitations and Improvements Paths

s x * Limitations and Improvements Paths. Damping Rings. Maxim Korostelev, Frank Zimmermann. ATF single-bunch emittances: ge x ~3.5-4.3 m m (CLIC: ~0.5 m m) ge y ~13-18 nm (CLIC: 3 nm) ge z ~8640 eVm (CLIC: <5400 eVm) 6D phase-space density in CLIC ~70 times higher

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s x * Limitations and Improvements Paths

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  1. sx* Limitations and Improvements Paths Damping Rings Maxim Korostelev, Frank Zimmermann Frank Zimmermann, CLIC “Away Day” 26 March 2006

  2. ATF single-bunch emittances: gex~3.5-4.3 mm (CLIC: ~0.5 mm) gey~13-18 nm (CLIC: 3 nm) gez~8640 eVm (CLIC: <5400 eVm) 6D phase-space density in CLIC ~70 times higher how can we go further? ATF CLIC ? new CLIC? Frank Zimmermann, CLIC “Away Day” 26 March 2006

  3. 2004: CLIC-NLC comparison for ITRP “Wise Men” *smaller emittance due to smaller bend angle / arc cell, less emittance detuning, more damping, smaller Hx in wiggler *higher energy reduces intrabeam-scattering effect Frank Zimmermann, CLIC “Away Day” 26 March 2006

  4. further progress in 2005 also: less charge per bunch Frank Zimmermann, CLIC “Away Day” 26 March 2006

  5. possible approachesfor achieving even smaller emittance • larger damping-ring circumference (weaker arcs & longer wigglers) + increased beam energy 2) damping in linac 3) laser wiggler? Frank Zimmermann, CLIC “Away Day” 26 March 2006

  6. larger circumference + higher energy MAD-X calculation w/o IBS horizontal emittance is 100 nm w/o IBS at 3.74 GeV not self-consistent, artificially kept longitudinal emittance at constant value (4500 eVm), opening-angle effect not included Frank Zimmermann, CLIC “Away Day” 26 March 2006

  7. analytical equations including IBS (Bane approx.) & opening angle H. Braun, M. Korostelev, F. Zimmermann, CLIC Note 594, 2004 opening angle dispersive terms IBS Frank Zimmermann, CLIC “Away Day” 26 March 2006

  8. result of my analytical calculation includes opening angle Karl Bane’s IBS approximation almost self-consistent (sz fixed = 1 mm) for case 2x circumference, I find large discrepancy in ez (w/o IBS) between analytical formula and MAD-X!? Frank Zimmermann, CLIC “Away Day” 26 March 2006

  9. exact calculation by Maxim best Frank Zimmermann, CLIC “Away Day” 26 March 2006

  10. exact calculation by Maxim cont’d >10% larger sextupole strength implies >10% smaller dynamic aperture Frank Zimmermann, CLIC “Away Day” 26 March 2006

  11. new ring parameters? Frank Zimmermann, CLIC “Away Day” 26 March 2006

  12. 2) damping in linac H. Braun, M. Korostelev, F. Zimmermann, CLIC Note 594, 2004 wiggler parameters quite challenging Frank Zimmermann, CLIC “Away Day” 26 March 2006

  13. 3) laser wiggler naturally small period assume laser parameters of Snowmass Posipol Proposal (CLIC note 639) laser wiggler equivalence: undulator regime! ~6% transverse emittance reduction per laser collision! however sd→50%! Frank Zimmermann, CLIC “Away Day” 26 March 2006

  14. conclusions laser wiggler → unacceptable energy spread superconducting wiggler in linac beyond present state of the art double wiggler length & increase beam energy to 3.74 GeV→15% reduction in gex & gey; but expect impact on dynamic aperture ~10% & 6x increased heat load Frank Zimmermann, CLIC “Away Day” 26 March 2006

  15. spare slide Frank Zimmermann, CLIC “Away Day” 26 March 2006

  16. DR equilibrium emittance without IBS & w/o 1/g present design: above can also be written as Frank Zimmermann, CLIC “Away Day” 26 March 2006

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