Recap of heat loads and peak doses from HL-LHC Q1 to Q7 L.S. Esposito, F. Cerutti HL-LHC WP3 meeting, 22 May 2014

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Beam Screen design evolution 16 mm absorbers 6 mm absorbers old version (BS #1) new version (BS #2) 1.cooling capillary (tube) size 2.absorber shape 3.INERMET beam screen thickness (2 ⇒ 1 mm) 2 BS #3

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 IT-D1: vertical crossing 3 BS#2, 50 cm gap in ICsBS#2, 10 cm gap in ICsBS#3, 50 cm gap in ICs Power 5 × cm -2 s -1 Magnet cold mass Beam screen Magnet cold mass Beam screen Magnet cold mass Beam screen Q1A + Q1B Q2A + corr Q2B + corr Q3A + Q3B CP D Interconnects Total Total values for horizontal crossing are about 10% lower

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Matching Section: horizontal crossing 4 Power 5 × cm -2 s -1 D2Q4Q5Q6Q7 Mask length [cm] Q5 aperture [mm] magnets correctors collimator masks (B1+B2) TAN intercepts ≃ 1kW (+20% for vertical crossing) Heat budget going into beam screen ≲ 10% Being the layout under definition, these figures should be taken as a rough estimation

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Peak dose and peak power density 5 BS #3Q1AQ1BC1Q2AQ2BC2Q3AQ3BC3D1 Peak power density [mW/cm 3 5 × cm -2 s Peak dose [MGy/3000fb -1 ] 81125* *15 *in the vertical plane (i.e. outside the coil) 50cm masks, 70mm Q5 D2 D2 corr Q4 corr Q4Q5 corr Q6 Q6 corr Q7 Q7 corr Peak power density [mW/cm 3 5 × cm -2 s # < Peak dose [MGy/3000fb -1 ] 36 # 4208~ # TCL4 at 20σ

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Intercomparison with MARS N. Mokhov, I. Rakhno, I. Tropin

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Integral power 10 cm gap in ICs50 cm gap in ICs Power 5 × cm -2 s -1 Magnet cold mass Beam screen Magnet cold mass Beam screen Magnet cold mass Beam screen Q1A + Q1B Q2A+orb corr Q2B+orb corr Q3A + Q3B CP D Interconnects Total MARS FLUKA BS #1 (for intercomparison purposes)

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Peak power density BS #1 (for intercomparison purposes)

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Peak dose BS #1 (for intercomparison purposes)

F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 In word Fine tuning of the new beam screen and interconnect (BPM) design plays an important role in determining peak dose values along the triplet-CP string Looking forward to implementing a realistic orbit corrector design TAN-TCL-TCAX set-up is presently under iteration to protect the matching section Back to numbers At 5L W in the IT-D1 cold masses, 550 W on the beam screen. ~50 W in the D2. In the coils: Peak power densities below 3mW/cm 3 ; Peak dose maxima around 30 MGy per 3000 fb -1 (DPA reaching the range).