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RADIATION LEVELS TODAY AND IN THE FUTURE

RADIATION LEVELS TODAY AND IN THE FUTURE. Francesco Cerutti on behalf of the whole team. R2E and Availability Workshop Oct 14, 2014. RELEVANT QUANTITIES. in the “long” term. activation related: RadioProtection matters:

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RADIATION LEVELS TODAY AND IN THE FUTURE

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  1. RADIATION LEVELS TODAY AND IN THE FUTURE Francesco Cerutti on behalf of the whole team R2E and Availability Workshop Oct 14, 2014

  2. RELEVANT QUANTITIES in the “long” term • activation related: RadioProtection matters: • residual dose rates (uSv/h) activity (Bq, vs Exemption Limits)intervention, waste • peak absorbed dose (MGy), in the magnet coils • Displacements Per Atom, peak particle fluence (cm-2) • for short term: instantaneous power (W, mW/cm3) on the collimators, beam intercepting devices, magnets • High Energy Hadron fluence, 1 MeV neutron fluence, dose maps around the machine • electronics locations

  3. TODAY AND FUTURE LOSS SOURCES [I] 7 TeV p + 7 TeV p @ L0 = 1034 cm-2 s-1 yields 1 kW towards each (L&R) side beam-beam collisions

  4. TODAY AND FUTURE SOURCES [II] beam impact on collimator jaws 2808 bunches of 1.15 1011 7 TeV p @ 0.2 h beam lifetime yields 500 kW towards the collimation system injected – dumped – collided BLM signals corrected by the FLUKA response factor

  5. TODAY AND FUTURE SOURCES [III] beam interaction with residual gas 1015 H2 eq. vacuum gauge reading of X 10-8 mbar (not relevant for long term: beam interaction with dust particles)

  6. MACHINE MODEL [I] today

  7. MACHINE MODEL [II] HL-LHC

  8. ESTIMATE OVERVIEW RR57 UX45 & US45 UP33 & UJ32 arc, RE MBW & MQW LSS MB MB DS triplet& D1 & D2 US85 triplet& D1 triplet area& UJ16

  9. P1: quads, correctors and separation dipole present D1:MBXW.A4 at the same order as MBW.B6 in P7 (the latter now screened) 8 quads + 2 (12) dipoles times two (P5)

  10. P1: FUTURE TRIPLET AREA AND UJ16 vertically averaged over 40 cm 2 109 per year

  11. P5: PRESENT MATCHING SECTION AND RR57 7 TeV proton energy vertically averaged over 40 cm collision debris beam 1 - gas 0.58 A 1015 m-3 H2eq. density 107 s = 100 fb-1 / L0 TCL6 (@10s)

  12. P5: RR57 DURING 2012 OPERATION Agreement within 30%

  13. P8: TRIPLET AND DIPOLES additional coil mask advisable! + 2 dipoles 8 quads + 2 dipoles

  14. P8: US85 [cm-2] y [cm] vertically averaged from -1.1m to 2.4m (0 is the beam height) x [cm] x [cm] [Gy] longitudinally averaged over 4m (from 2m to 6m, 0 is the cavern center)

  15. P2: MAIN DIPOLE IN DS CELL 10 2.76 TeV/n 208Pb (81+) from Pb+Pb @ 6 1027 cm-2 s-1 [mW/cm3] [R. Bruce] 20 MGy over 10 nb-1 2 main dipoles x [cm] reduction of a factor 25 (100) with 0.5m Cu (1m W) TCLD and 11T MBHDP

  16. P7: LSS proton losses in the collimator jaws (for tight settings: TCPs @ 4.3s and TCSG @ 6.3s) from the collimation team 7 TeV 1.15 1016 lost protons per beam vertically averaged over 10cm beam 2 mirrored no beam 2 4 warm dipoles + 24 warm quadrupoles [times two + 2 MBW (P3)] discussed on Thursday

  17. P7: DS MAGNETS proton losses in the collimator jaws (quench test settings) from the collimation team 4TeV 0.63 1016 B2 protons lost in 2012 beam 2

  18. QPS, CRYO, EPC, and BI equipment proton losses in the collimator jaws (quench test settings) from the coll. team P7: BELOW THE DS MAGNETS 4TeV 0.63 1016 B2 protons lost in 2012 beam 2

  19. ARC: BELOW THE MAGNETS both beams QPS, CRYO, EPC, and BI equipment 7 TeV proton energy 0.58 A 1015 m-3 H2eq. density 107 s

  20. ARC: RE38 7 TeV proton energy 0.58 A 3 1014 m-3 H2eq. density 107 s both beams 10 m vertically averaged over 20cm 10 1010 1011 1 109 1010 10-1 108 109 10-2 107 108 10-3 106 107 105 106 10-4 104 10-5 105 103 104 10-6 -20 m dose [Gy] HEH fluence [cm-2] 1MeV neutron fluence [cm-2] concrete chicane [LHC Project Note 363]

  21. P4: UX45 AND US45 4TeV proton energy 0.39 A73.5 days [cm-3] [G. Bregliozzi] [cm-2] vertically averaged over 2m around the beam height see also LHC Project Note 342

  22. P3: UP33 AND UJ32 7 TeV proton energy 0.58 A 1015 m-3 H2eq. density 180 days HEH fluence beam 2 - gas + collimation losses 7 TeV proton energy 0.58 A 3 1014 m-3 H2eq. density 107 s both beams [LHC Project Note 364]

  23. CONCLUSIONS Let’s take note of what is missing

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