Study of alternative optical parameters for the ILC final focus On-going work and plans Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay, France LCWS13 Tokyo, 11-15 November 2013 On behalf and based on collaboration with: Vincent Tugayé (student, ENS-Lyon), Oscar Blanco (PhD), Jie Gao (IHEP), Dou Wang (IHEP), Yiwei Wang (PhD, IHEP)
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Study of alternative optical parameters for the ILC final focus On-going work and plans Philip Bambade Laboratoire de l’Accélérateur Linéaire Université.
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Study of alternative optical parameters for the ILC final focus
On-going work and plans
Philip BambadeLaboratoire de l’Accélérateur Linéaire
Université Paris 11, Orsay, France
LCWS13 Tokyo, 11-15 November 2013
On behalf and based on collaboration with:
Vincent Tugayé (student, ENS-Lyon), Oscar Blanco (PhD), Jie Gao (IHEP), Dou Wang (IHEP), Yiwei Wang (PhD, IHEP)
First presented by Yiwei WANG, CLIC workshop, January 2013https://indico.cern.ch/contributionDisplay.py?contribId=191&confId=204269
RE-OPTIMIZATION OF THE FINAL FOCUS SYSTEM OPTICS MAINLY WITH VERTICAL CHROMATIC CORRECTION
Further description, see TUPME024 @ IPAC13
Parameters ValueBeam energy (GeV) 250
Normalized emittance (um) 10/0.04Energy spread (%) 0.06Beta functions at IP (mm) 15/0.4Angular dispersion at IP 0.008Beam sizes at IP (nm) 590/7.4Beam divergence at IP (urad) 37/14
Conclusions and prospects• Originally proposed scheme with only 2 sextupoles to correct only
the vertical chromaticity would require unreasonably small bunch length to maintain the luminosity
• An intermediate scheme seems feasible, which retains some of advantages of flat beams while keeping high luminosity
- weaker and / or fewer sextupoles for easier handling of the FFS - less beamstrahlung• It can be considered as alternative parameter set of the existing
design, not a new design• There is room for optimization • New parameterization of the pinch luminosity enhancement • A full study should consider all energies and different energy spreads
at ILC, as well as more complete beam-beam calculations• For flatter beams, may still consider new / simplified FFS design ideas