1. 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

2. 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 180 4.beam screen thickness (2 ⇒ 1 mm) 2 BS #3

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 [W] @ 5 × 10 34 cm -2 s -1 Magnet cold mass Beam screen Magnet cold mass Beam screen Magnet cold mass Beam screen Q1A + Q1B 110150110150110150 Q2A + corr 105501055010555 Q2B + corr 130701306513070 Q3A + Q3B 160601606015070 CP 704565456550 D1 1005095509055 Interconnects 258525952590 Total 700510690515675535 Total values for horizontal crossing are about 10% lower

4. F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Matching Section: horizontal crossing 4 Power [W] @ 5 × 10 34 cm -2 s -1 D2Q4Q5Q6Q7 Mask length [cm] 10050100500100501005010050 Q5 aperture [mm] --90 7090 709070 magnets 45645.5675.5+26+27332.42+2 1.3+0.6 correctors 3+2 3+2+1.55+2+28+3+20.5 0.2 0.10.5 0.2 collimator 7565---220215220857570--- masks (B1+B2) 20+410+216+1.512+1-9+1.51+113+2.53.5+3.52.5+2.51.4+1.7--- 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

5. 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 × 10 34 cm -2 s -1 0.71.1 2.02.5 2.21.11.3 Peak dose [MGy/3000fb -1 ] 81125*223228293344*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 × 10 34 cm -2 s -1 1.8 # 0.40.60.30.80.10.3<0.10.20.1 Peak dose [MGy/3000fb -1 ] 36 # 4208~2023256 # TCL4 at 20σ

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

7. F. Cerutti, HL-LHC WP3 meeting, 22 May 2014 Integral power 10 cm gap in ICs50 cm gap in ICs Power [W] @ 5 × 10 34 cm -2 s -1 Magnet cold mass Beam screen Magnet cold mass Beam screen Magnet cold mass Beam screen Q1A + Q1B10017510017097172 Q2A+orb corr9560100659965 Q2B+orb corr115801208011781 Q3A + Q3B140801408013775 CP55 60556065 D1906090609056 Interconnects20140201051586 Total615650630615 601 MARS FLUKA BS #1 (for intercomparison purposes)

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

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

10. 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 0 700 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 10 -4 - 10 -3 range).