1st HiLumi LHC / LARP Collaboration Meeting 2011 Nov 17th WP10 (SHORT TERM) PLANS Francesco Cerutti 1st HiLumi LHC / LARP Collaboration Meeting 2011 Nov 17th

WP10 ACTORS team N. Mokhov and his team MARS-FLUKA intercomparison on a dedicated simplified model of the interaction region LHC Project Note 411 follow up, including dpa and activation calculation

WP10 SCOPE Secondary particle showers and energy deposition calculations are required to address many aspects warm (TAS, TAN) and cold absorber mechanical design material irradiation test support electronics shielding issue deliverable synergies quench power distribution WP2, WP3, WP5 cooling integral power material damage dose distribution, differential particle fluence, DPA SC link all above WP6 radiation to electronics hadron fluence (SEE), ... R2E working conditions of instrumentation differential particle fluence, energy deposition WP15, BE/BI background to experiments differential particle fluence WP8 activation radionuclide inventory, residual dose rates DGS/RP Cryogenic BLM workshop, 2011 Oct 18

THE FOCUS REGION i. collision debris (~ luminosity) ii. beam losses on the tertiary collimators (~beam intensity) iii. beam – residual gas interaction(~ beam intensity and gas density) first

BUILDING THE MODEL [I] native FLUKA geometry Extensive use of lattice capabilities Element database Automatic line building

BUILDING THE MODEL [II] MARS15 geometry of IR5 present triplet

JAN-JUN 2012 expected INPUT intended OUTPUT launch the iteration optics – layout – power load with WP2 and WP3 colleagues towards the definition of the triplet aperture as the first goal, implying a coordinated communication of input/output information set up of a dedicated framework designed to flexibly integrate the evolution of the relevant parameters layout i.e. magnet (magnetic/mechanical) length, aperture, strength, interconnect correctors magnet cross section (in particular coil design), field maps cold bore & (octagonal) beam screen crossing angle & divergence i.e. β* TAS aperture room for shielding (all along the triplet or in the Q1 only) ... experimental vacuum chamber 120 mm, 140 mm x Nb-Ti, Nb3Sn peak - in the coils - and integral power assessment (beam screen) shielding optimization expected INPUT quench limits intended OUTPUT

120 mm, 123 T/m (Nb-Ti) sLHCv2.0 by S. Fartoukh x 2.5 x 2.5 x 2.5 x 3 A. Mereghetti’s talk, 2009 Dec 10 SLHC-IRP1, TDG meeting

SIMULATION RELIABILITY stable collisions in P1 at 7 TeV center-of-mass on 2010 Oct 28 BENCHMARKING VS FIRST LHC EXPERIENCE [A. Lechner] quench test induced by the wire scanner (at 25cm/s) on 2010 Nov 1 on the left of P4 at 3.5TeV absolute comparisons! geometry details are critical for the accuracy of the prediction of the BLM responses

REMARKS & PERSPECTIVES N.B. despite the reported remarkable agreement wrt the measured BLM patterns, achieved trough the time consuming implementation of many details, Monte Carlo estimates – especially for point quantities – are affected by systematic uncertainties (due to the machine description and the critical dependence on few collision products emitted inside a tiny solid angle). Therefore reasonable margins should never be forgotten, and relative comparisons between different configurations have to be considered as inherently carrying a stronger reliability than absolute predictions, provided that a consistent simulation framework is constantly used Detailed investigation of the interaction region up to the Matching Section Construct the complete models of the TAS-D2 region for the preferred triplet aperture and the two alternative superconducting materials Re-evaluate the power deposition maps on the basis of new layout/geometry details Assess the peak dose/dpa in all delicate components (coils of quadrupoles, correctors and separation dipoles, cryostat gaskets...) Calculate the impact of tertiary collimator (TCT) showers on the basis of the available loss maps Study of the warm absorbers (TAS and TAN) Provide detailed maps of power deposition on the TAS and TAN Assist the needed iterations with the successive thermomechanical analyses Survey on the Matching Section and the Dispersion Suppressor (DS) Extend the model up to the end of the DS Evaluate the power deposition profile all along the line, including the beam-gas interaction contribution Iterate the above evaluation as a function of the active absorber (TCL) scheme Evaluation of working conditions for instrumentation and electronics Characterize the radiation field at the locations of the monitors (e.g. BLMs), supporting a possible optimization of their design/positioning; Calculate the relevant radiation quantities at the electronics locations