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Achromatic Telescopic Squeezing Scheme for LHC and HL-LHC Commissioning

This document outlines the Achromatic Telescopic Squeezing (ATS) scheme for the Large Hadron Collider (LHC), detailing the participants involved, the planned operational phases, and the required beam parameters for successful implementation. The initial phase focuses on deploying new injection optics and corresponding ramp configurations. Subsequent phases will standardize operations at 3.5 TeV, aiming for a beam squeeze of down to 30 cm in interaction regions. The report highlights the preparation status, including optics repository completion and settings generation, ensuring a safe and efficient beam commissioning process.

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Achromatic Telescopic Squeezing Scheme for LHC and HL-LHC Commissioning

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  1. The ATS MDs(Achromatic Telescopic Squeezing scheme) Participants: C. Alabau, R. Assmann, R. Calaga, R. De Maria, S. Fartoukh, M. Giovannozzi, B. Goddard, W. Hofle, R. Miyamoto, G. Muller, S. Redaelli, M. Strzelczyk, R. Steinhagen, E. Todesco, R. Tomas, G. Vanbavinckhove, Jorg Wenninger, F. Zimmerman. Theme: LHC Nominal (b* 30 cm if permitted by emittance and IT aperture) + HL-LHC(b* 15 cm or 30/7.5 cm: “round” or “flat optics”) Number of MDs requested: 5+1 (in 2011/2012) Type of beams: 1E10 (1 bunch/beam), ge<1.5 mm  safe beam First MD block: - Wed 12:00/16:00  HWC of injection + ramp w/o beam - Sat 12:00/20:00  Beam commissioning of the new inj. optics (+ramp) S. Fartoukh, LSWG 19/04/2011

  2. Overall Plan  3 different phases • Phase A: new injection optics + ramp  In particular new tunes Qx/y=62.28/60.31 (see MD proposal and slide 4 for other details) • Phase B: “Standard”pre-squeeze @ 3.5 TeV to b*=1.2 m in IR1/5, •  other choice possible in between 40 cm (limited by MS strength at 7 TeV) and 2 m (limited by IR1/5 quad strength at 7 TeV with specific Left/Right phase advances) • Phase C: Continuation of the squeeze down to b*=30 cm in IR1, • At constant settings in IR1, but using IR8 and IR2 and increasing the peak b-functions by a factor of 4 in s81 and s12. • Status of preparation: • Optics repository near to completion (SF):afs/cern.ch/eng/lhc/optics/ATS_V6.503 • Setting generation: on-going (SR, GM et al.) • a2 global knob and b2 pre-settings in preparation (CA, MS) • b-beating team ready soon (RT et al.) S. Fartoukh, LSWG 19/04/2011

  3. Illustration for IR1 applying the ATS scheme to reach b*= 10 cm (pre-squeeze to 40 cm and further squeeze by a factor of 4 using IR8 and IR2) Beam sizes [mm] at 3.5 TeV (ge=1.5mm) and dispersion [m] for Beam1 from Q13.L8 to Q13.R2 S. Fartoukh, LSWG 19/04/2011

  4. S. Fartoukh, LSWG 19/04/2011

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