Energy deposition studies 30 cm TCPs with thicker

Energy deposition studies: 30 cm TCPs with thicker jaws and no skew M. I. Besana, F. Cerutti, E. Skordis, and M. Varasteh EN-STI-FDA (FLUKA Team) Inputs by Collimation Team; R. Bruce, A. Mereghetti and D. Mirarchi European Organization for Nuclear Research (CERN), Geneva, Switzerland

Introduction Betatron collimation insertion region: § Length of 2. 7 km ≈ 5 times of LHC § 8 warm dipoles • 17 m long and 1. 85 T magnetic field • return coil design was changed to protect them from radiation (A. Milanese) • beam-beam separation 250 mm in the arc (204 mm in current assumption) and 400 mm in the insertion center • beam-pipe aperture 29. 5 mm x 22 mm § 24 warm quadrupoles • 15. 54 m long • simple design (LHC inspired) (400 mm beam separation) • beam-pipe aperture (15. 26 mm x 26. 14 mm) Collimators Length (cm) Aperture (σ) Material Number Primaries 30 7. 6 CFC 2 Secondaries 100 8. 8 CFC 11 Active Absorbers 100 12. 6 tungsten 4 Passive absorbers are (LHC models): • TCAPA. 6 L (1. 5 m long) in front of MBW. B 6 L • TCAPB. 6 L (0. 4 m long) in front of MBW. A 6 L • TCAPC. 6 L (1 m long) in front of MQWA. E 5 L M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 2

Collimators jaws Similar design and composition as LHC… § 30 cm TCP was proposed to reduce the shower development inside the primary collimators § Thicker jaw was implemented in order to avoid the highest power density in the metallic structure * The active length of the TCP is reduced to 30 cm but the actual length is still 1. 2 m! § Skew TCP with total power above 150 k. W was removed from the layout FLUKA showering calculation takes the touch distribution from the Six. Track-FLUKA coupling. M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 3

Power sharing § Considering 12 minutes of beam lifetime Power loss is 11. 8 MW (0. 5 MW for LHC) § Power sharing between different elements of the warm section for: • • Vertical halo, 60 cm TCP presented by I. Besana (20. 07. 17) Vertical halo, 30 cm TCP presented by M. Varasteh (20. 17) • Present study 30 cm TCP, Vertical Halo: § § § TCPs jaws 3. 5 cm (instead of 2. 5 cm) TCSGs jaws 4. 5 cm (instead of 2. 5 cm) TCPB (skew) Removed Power fraction on the different elements of the warm section TCP 30 cm ELEMENTS TCP 60 cm TCP 30 cm Thicker Jaw, w/o TCPB TCP and TCS jaws Warm quadrupoles Warm dipoles Passive absorbers Beam pipe Tunnel wall Other elements Neutrinos/E -> m M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 6. 7% 5. 4% 13. 7% 7. 9% 14. 2% 44. 9% 3. 3% ~4% 5. 7% 6. 9% 14. 3% 8. 8% 13. 6% 43. 3% 3. 2% ~4% 2. 7% 6. 9% 15. 4% 9. 4% 14. 4% 44. 1% 2. 8% ~4% 20. 11. 2017 4

Power on collimators & absorbers Collimator Jaws TCP 60 cm TCP 30 cm Thicker Jaw, w/o TCPB Primaries (k. W) TCP. D 6 L TCP. C 6 L TCP. B 6 L 14. 7 158. 7 260. 8 7. 7 99. 2 153. 7 6. 5 79. 7 226. 6 13. 9 51. 2 43. 5 11. 7 14. 1 18. 2 5 9. 4 14. 6 2. 4 9. 8 41. 2 32. 9 6. 4 11. 6 13. 6 3. 3 7. 2 12. 5 2. 3 -16%▼ -20%▼ NA Secondaries (k. W) TCSG. A 6 L TCSG. B 5 L TCSG. A 5 L TCSG. D 4 L TCSG. B 4 L TCSG. A 4 R TCSG. B 5 R TCSG. D 5 R TCSG. E 5 R TCSG. 6 R M. 220. 9 10. 6 40. 8 33 8. 2 10. 8 13. 7 3. 9 6. 7 10. 9 1. 8 -59%▼ -20%▼ -24%▼ -45%▼ TCP 60 cm TCP 30 cm Thicker Jaw, w/o TCPB Active absorbers (k. W) TCLA. A 6 R TCLA. B 6 R TCLA. C 6 R TCLA. D 6 R 37. 7 2. 34 1. 7 36. 5 2 2. 2 1. 6 501. 9 74. 8 455. 96 545. 1 78. 2 484. 3 23 1. 6 1. 75 0. 46 -3%▼ -26%▼ -6%▼ Passive absorbers (k. W) TCAPA. 6 L TCAPB. 6 L TCAPC. 6 L 450. 8 73. 4 404. 7 9%▲ 5%▲ 6%▲ -18%▼ -26%▼ -35%▼ -23%▼ -15%▼ Ø About a factor of 2 power reduction on the vertical and horizontal primaries and on the first secondary w. r. t. 60 cm scenario -4%▼ Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 5

Peak power density on Vertical Primary x-y-z resolution: 5μm, and 1 cm x-y-z resolution: 0. 24 cm, 1 cm, and 10 cm 2. 5 cm Jaw The most exposed collimator in terms of peak power density: Vertical TCP with a total power which is more than a factor of 10 less than the Horizontal Primary 3. 5 cm Jaw, w/o TCPB M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 6

Peak power density on Horizontal Primary 2. 5 cm Jaw (x-y-z resolution 0. 24 cm, 10 cm) 3. 5 cm Jaw, w/o TCPB (x-y-z resolution 0. 24 cm, 1 cm, 5 cm) M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 7

Power density on the First Secondary 2. 5 cm Jaw x-y-z resolution: 0. 24 cm, 10 cm • TCSG. A 6 L 800 Wcm-3 • TCSG. A 5 L 90 Wcm-3 • TCSG. D 4 L 33 Wcm-3 4. 5 cm Jaw, w/o TCPB • TCSG. A 6 L 115 Wcm-3 • TCSG. A 5 L 85 Wcm-3 • TCSG. D 4 L 30 Wcm-3 60 cm. TCP, v-halo, Thicker TCS: • TCSG. A 6 L 130 Wcm-3 in LHC: • Secondary 10 Wcm-3 M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 8

Two dipole modules 30 cm TCP, with Skew TCP, Standard Jaws Total Power TCP 30 cm TCP 60 cm TCP 30 cm Thicker Jaw, w/o TCPB MBW. B 6 L 0. 69 MW 0. 7 MW 0. 68 MW (-3%▼) MBW. A 6 L 0. 93 MW 0. 99 MW 1. 1 MW (11%▲) M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 30 cm TCP, w/o Skew TCP, Thicker Jaws § Maximum power per meter increased from 250 k. W/m to 270 k. W/m but the bulk is below 100 k. W/m § Maximum power on dipole = 1. 1 MW (22 k. W at LHC) 20. 11. 2017 9

Summary In case of short primary scenario, by removing the skew TCP and enlarging the collimators jaws: § Power fraction on the collimators jaws is reduced from 5. 7% to 2. 7% (all below 100 k. W) § Total power on the v-TCP and h-TCP are reduced by 16% and 20%, respectively § Surface of the directly impacted collimator is still at tens of k. W/cc § Peak power density on the first secondary collimator is reduced by a factor of 7 § Impact on the magnets is only slightly worsened M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 10

Mohammad Varasteh www. cern. ch CERN EN-STI-FDA FLUKA Team m. varasteh cern. ch

Backup Slides M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017 12

Power density (60 cm vs 30 cm) Skew TCP (60 cm TCP) (30 cm TCP) resolution 0. 24 cm, 10 cm M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017

Distribution of touches (60 cm vs 30 cm) M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017

60 cm TCP M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017

60 cm TCP M. Energy deposition studies: 30 cm TCPs with thicker jaws and no skew CERN - FCC collimation design meeting #14 20. 11. 2017