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Collimator and beamline heating

Collimator and beamline heating. External Review of the LHC Collimation Project Vasilis.Vlachoudis@cern.ch CERN Wed 30/6/2004. FLUKA Simulation of a 100m section of the IR7 region (betatron cleaning) Normal operation 0.2 hours beam life time  4 ×10 11 p/s for 10 s

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Collimator and beamline heating

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  1. Collimator and beamline heating External Review of the LHC Collimation Project Vasilis.Vlachoudis@cern.ch CERN Wed 30/6/2004

  2. FLUKA Simulation of a 100m section of the IR7 region (betatron cleaning) Normal operation0.2 hours beam life time 4×1011 p/s for 10 s Energy deposition from cross talk of collimators IR7 Layout Description

  3. x z y IR7 Geometry MBW.C6L6 MBW.A6L6 MBW.D6L6 MBW.B6L6 TCSH.016.B1 TCS.016.B1 Beam 2 Beam 1 TCPS2 TCPV TCS.001.B1 TCPS TCSH.002.B1 TCSH.001.B1 TCPH TCS.002.B1 Top View Cross Section

  4. 10 Inox (5mm) Water (8mm) 5 y x Graphite (2.5cm) Hybrid with Copper × × z 0 Vacuum (5s,10s) Copper (4mm) p/4 -5 -10 TCPS -10 -5 0 5 10 cm 0.672rad 2.424rad Collimator Geometry Primary Collimators TCPV Beam 2 Beam 1 3p/4 Cross Section TCPS2 TCPH Length 20 cm Secondary Collimators 0.008rad TCS.016.B2 TCS.001.B1 TCS.002.B1 Length 120 cm

  5. Beam 2 Beam 1 Other items • Beam Tube • Material: Copper • Inner radius: 4.2 cm • Outer radius: 4.4 cm • Inside MBW • Rin: 2.2 cm • Rout: 2.4 cm • Dogleg Bends • Modules: 4 • MBW.A6L7 • MBW.B6L7 • MBW.C6L7 • MBW.D6L7 • Dimensions: 1.00 x 0.7 x 3.4 m3 • Apperture: 52mm • Magnetic Field: 1.287 T • Kick angle: 0.38 mrad TCSH.016.B1 TCS.016.B1 MBW.C6L6 MBW.D6L6 MBW.B6L6 MBW.A6L6 TCS.001 TCS.002 TCPS2 TCPS TCPV TCPH Top View

  6. Cases Studied • Proton beam: • Momentum 7 TeV/c • Impact parameter: 200 nm • Pencil-beam on Primaries 1cm before the end(misaligned ~25 mrad) • Pencil-beam on Secondaries at the front face(perfectly aligned) • 1st phase system (no hybrid collimators) • Results are weighted with the loss maps provided by R.Assmann assuming multiple traversals of the beam. • 3 cases: Impact at TCPV, TCPH, TCPS • 2nd phase system (with hybrid collimators) • Results are given for 0.2 hours beam life time:Loss rate = 4×1011 p/s for 10 s

  7. Loss Maps TCP 1 q= p/2 Div.x = 0 mrad Div.y = 17 mrad Aperture = 1.22 mm TCP 2 q= 0 Div.x = -22.44 mrad Div.y = 0 mrad Aperture = 1.63 mm TCP 3 q= 3p/2 Div.x = -15.79 mrad Div.y = 12.39 mrad Aperture =1.44 mm

  8. TCPV - Energy deposition W/cm3 MBW.C6L6 MBW.A6L6 MBW.D6L6 MBW.B6L6 TCSH.016.B1 TCS.016.B1 TCPS2 TCPV TCS.001.B1 TCPS TCSH.002.B1 TCSH.001.B1 TCPH TCS.002.B1 Average energy deposition per 4×1011p/s on tunnel and beam elements for -1 < Y < 1m * Not weighted with the loss map

  9. Dogleg Bending Magnets (MBW) Front Face Beam 2 Beam 1 Max. Energy deposition for MBW.B6L7 16 W/cm3/4×1011p/s * Not weighted with the loss map

  10. Graphite Copper Water Inox Inox Phase #1: Case TCP1 (TCPV) TCS.001.B1 TCS.002.B1 W/cm3/4 1011p Graphite Copper-T Water Inox Graphite Copper-T Water Inox Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time) on secondary collimators

  11. Graphite Copper Water Inox Inox Phase #1: Case TCP2 (TCPH) TCS.001.B1 TCS.002.B1 W/cm3/4 1011p Graphite Copper-T Water Inox Graphite Copper-T Water Inox Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time) on secondary collimators

  12. Graphite Copper Water Inox Inox Phase #1: Case TCP3 (TCPS) TCS.001.B1 TCS.002.B1 W/cm3/4 1011p Graphite Copper-T Water Inox Graphite Copper-T Water Inox Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time) on secondary collimators

  13. Phase #1: Beam tube * Not weighted with the loss map

  14. Phase #1: Power Deposition

  15. Primary Collimators TCPV: 10 W TCPH: 290 W TCPS: 700 W TCPS2: 1.7 kW Secondary Collimators TCS.001.B1 12 kW TCS.002.B1 27 kW TCS.003.B1 245 W Motors < 200 W Phase #1: Power Distribution • Total power intercepted 233 kW (52%) +TunnelRemaining 48% energy escapes downstream130 kW (30%) on beam elements • MBW • Iron: 21 kW, 9.5 kW • Copper 6 kW, 1.5 kW • Beam Tubes • Beam1: 34 kW • Beam2: 2.4 kW * TCP1 Loss scenario

  16. Graphite Copper Water Inox Inox Phase #2: With Hybrid TCS.001.B1 TCSH.001.B1 W/cm3/4 1011p Copper Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time) on secondary collimators * Not weighted with the loss map

  17. Graphite Copper Water Inox Inox Phase #2: With Hybrid (cont) TCS.002.B1 TCSH.002.B1 W/cm3/4 1011p Copper Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time) on secondary collimators * Not weighted with the loss map

  18. Phase #2: Beam tube * Not weighted with the loss map

  19. Total power intercepted 363 kW (81%) +TunnelRemaining 19% energy escapes downstream247 kW (55%) on beam elements Beam Tubes Beam1: 14 kW Beam2: 1.8 kW Phase #2: Power Deposition * Not weighted with the loss map

  20. Results • Collimators intercept the largest fraction of the energy • For hadron-nucleon interaction at these energies one expect a Pt=350 MeV/c • For hadron-nucleus interaction we havePt=400-500 MeV/c thus Pt/P=100 mrad (4 mm at 40m) • Structural elements (i.e. MBW, flanges...) around the beam tube do not affect much the development of the shower • Phase #1 (no hybrid) • Results are weighted with the loss map • TCS.002.B1 ~30 kW • No significant difference between the various cases • Energy deposition on beam pipe peaks ~30 W/cm • Phase #2 (with hybrid) • TCSH.001.B1 130 kW! • Pending: Loss map weighting

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