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Francesco Cerutti , Luigi S. Esposito CERN, EN-STI

&. team. POWER AND DOSE DEPOSITION BY THE COLLISION DEBRIS. Francesco Cerutti , Luigi S. Esposito CERN, EN-STI. OUTLINE. the collision debris (present) final focus triplet, today and tomorrow looking farther (at separation dipoles) and farther (at matching section quadrupoles )

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Francesco Cerutti , Luigi S. Esposito CERN, EN-STI

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  1. & team POWER AND DOSE DEPOSITION BY THE COLLISION DEBRIS Francesco Cerutti, Luigi S. Esposito CERN, EN-STI

  2. OUTLINE • the collision debris • (present) final focus triplet, today and tomorrow • looking farther (at separation dipoles) • and farther (at matching section quadrupoles) • looking forward to high luminosities and apertures • next steps F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  3. THE COLLISION DEBRIS [I] 7 TeV p + 7 TeV p FLUKA-DPMJET beyond the present TAS (absorbing ~150W at L=L0=1034cm-2s-1) about 2.5% of the interaction products and 35% of 14TeV, i.e. 650W at L=L0 on each side! with a 50mm aperture TAS about 3.5% of the interaction products and almost 40% of 14TeV, i.e. 3.5kW at L=5L0 a 60mm aperture TAS would collect 400 W at L=5L0 F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  4. THE COLLISION DEBRIS [II] lost in Q1 present triplet 25MGy/300fb-1 (P1) end of the TAS shadow lost in Q1 F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  5. FROM 2011 TO ... POST-LS1 3.5 TeV p + 3.5 TeV p F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  6. IP Q3 BENCHMARKING BLM response along IR5 triplet BLM dose per collision assuming CMS luminosity measurement and 73.5 mb proton-proton cross-section (from TOTEM) F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  7. TAS AND CROSSING ANGLE EFFECT crossing angle TAS • the TAS has meaning only for (the first half of) of Q1! • the crossing angle plays a significant role F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  8. TAN EFFECT P8 2 1033 cm-2 s-1 without TAN P5 1034 cm-2 s-1 with TAN 25 W 2.5 W D2 D1 (80 mm) triplet (70 mm) • the TAN is clearly essential for the D2 protection at high luminosities • [cf. CERN/TIS-RP/IR/94-17 (1994) and LHC Project Report 633 (2003)] F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  9. TCL EFFECT P5 1034 cm-2 s-1 w/ and w/o TCL • Q5 and Q7 require TCL in place • [cf. LHC Project Report 398 (2000) and LHC Project Report 633 (2003)] F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  10. C2 C1 TAS Q3 Q2 Q1 THE HL-LHC TRIPLET (ITS Nb3Sn 140mm OBSOLETE VERSION) 600W (60mm aperture) 800W 400W considering the experimental vacuum chamber no beam screen 2012 Jun 7 L. Esposito presentation at the WP’s joint meeting 3.7mm, 10 mm x stainless steel, tungsten peak power profile averaged over the cable radial thickness in the innermost strands 13 F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  11. SHIELDING Beam screen with W absorbers at mid-planes • 3.7 mm BP + 2 mm BS + 6 mm W absorbers • with 0.5 mm clearance between BP and W • 111.6 mm residual aperture at mid-planes • for 140mm coil aperture < 50 MGy per 3000 fb-1 • to stay below 20MGy, one should envisage 9 mm W absorbers • i.e. ~115 mm residual aperture at mid-planes for 150mm coil aperture F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  12. TOWARDS A MORE REALISTIC MODELINGOF MAGNET ENDS • ... wherehighest energy deposition takes place F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

  13. CONCLUSIONS AND PERSPECTIVES • Coil insulator damage in the new triplet quadrupoles (and in the nearby correctors, D1...) over the target HL-LHC integrated luminosity, looks as the main issue from the radiation point of view. In order to stay below few ten MGy,several mm of tungsten must be embedded inside the aperture at mid-planes. • As soon as optics, layout (distances) and correctors’ specs are defined by WP2 and WP3 colleagues, a new energy deposition study will be launched for the adopted 150mmquadrupole aperture, including the downstream corrector package and 160mm D1 (already implemented). • For the present machine, the P1 and P5 Dispersion Suppressors do not look to be at risk for proton operation (see TCL study with WP5). • The LHCb luminosity upgrade to 2 1033 cm-2s-1turns out to be compatible with the present machine layout (a warm protection may be desirable to reduce the load on the D2). • Warm magnets in P7 and P3 will hardly survive the radiation dose from collimator losses over the HL-LHC era (tentative lifetime approached after 300fb-1 at 7 TeV beam operation). F. Cerutti Nov 15, 2012 2nd Joint HiLumi LHC-LARP Annual Meeting INFN Frascati

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