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L4 transfer line to the PSB update from Oct 2010

L4 transfer line to the PSB update from Oct 2010. Christian Carli , Margarita Garcia Tudela Alessandra Lombardi Lutz Hein, Mohammad Eshraqi. LINAC4 transfer line – optics . 14 OCTOBRE-2010. L4. L2. PSB. Optics Layout Tunability Safety margins. ↕ 2.5m.

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L4 transfer line to the PSB update from Oct 2010

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  1. L4 transfer line to the PSBupdate from Oct 2010 Christian Carli, Margarita Garcia Tudela Alessandra Lombardi Lutz Hein, Mohammad Eshraqi LINAC4 BCC -1 septembre 2011

  2. LINAC4 transfer line – optics 14 OCTOBRE-2010 L4 L2 PSB • Optics • Layout • Tunability • Safety margins ↕ 2.5m LINAC4 transfer lines : 177.31 m (from PIMS out to foil); 69.83 m new line,then join at BHZ20 the present Linac2 line (107.48 meters from BHZ20 to foil). Active elements : 4+2bendings;16+18 quads,11+11 steerers and 1 RF cavity. Active elements : 5+2bendings;17+18 quads,13+11 steerers and 1 RF cavity. M. Eshraqi, L. Hein, A. Lombardi (BE-ABP)

  3. Main changes • Horizontal bending : 70 degrees from the Linac4 into the connecting tunnel are done with 3 bendings instead of 2 . Motivation : use short(er) H bends. • Vertical step : 2.5 meters between Linac4 and PBS are done on a 15 degrees slope instead of 28 degrees. Motivation : decrease the gradient in the quadrupoles. LINAC4 BCC -1 septembre 2011

  4. Top View proposed layout BCT somewhere before debuncher BCTs close (not too) to entrance and exit of bend (losses in vertical step) BCT (not too) close to exit of bend BCT as far upstream as possible (reference value) Profile monitor (momentum spread measurement with Special quad setting) Profile monitor (beam size critical at entrance in vertical step) C. Carli

  5. 3 horizontal bends layout Proposed Layout BHZ.20 10 m 8.2m • 3 horizontal magnets • Angle = 70/3 = 23.33 deg • L= 4.1m (from deflection point to the next bending dp) • Lmag= 870 mm • Larc= 876mm • ρ = 2151.15 mm

  6. Vertical step • Achromatic translating system. • Need to have 2π phase advance at zero current • The longer the distance between the two vertical bendings the stronger the integrated quadrupole gradient. LINAC4 BCC -1 septembre 2011

  7. Beam dynamics (Up to BHZ.30)

  8. Beam dynamics (Up to BHZ.30)

  9. Beam dynamics (Up to BHZ.30)

  10. Conclusion • Beam dynamics has been recalculated after adapting the layout to the bending and quads design. • nominal beam quality, flexibilityand sensitivity are unchanged seen from the PBS. • Needs to be verified • Steering sensitivity with new layout and vacuum chamber • Detail the commissioning strategy and dispersion control LINAC4 BCC -1 septembre 2011

  11. Appendix – Straight line • Reduced distance bending towards the tunnel to the dump entailed a redesign of the emittance measurement line before the dump. • Make use of the “forward method reconstruction” : improved accuracy on the evaluation of emittance from profile measurements in presence of space charge LINAC4 BCC -1 septembre 2011

  12. Emittance estimation in L4Z • Hardware: 3 semgrids. No extra quads! • Minimum rms beam size is +- 1 mm -> Resolution 0.3-0.5 mm. • Location of the semgrids: - just after quadrupole L4T.MQF.0210 • just before L4T.MBH.0250 . • 2 meters after the L4T.MBH.0250

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