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FLUKA status and plan Sixth TLEP workshop CERN, 16 -18 October 2013

FLUKA status and plan Sixth TLEP workshop CERN, 16 -18 October 2013. F. Cerutti # , A. Ferrari # , L. Lari * , A. Mereghetti # # EN Dept. & * BE Dept. Outline. A few reminders about Synchrotron Radiation FLUKA implementation Some geometrical considerations R esults

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FLUKA status and plan Sixth TLEP workshop CERN, 16 -18 October 2013

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  1. FLUKA status and planSixth TLEP workshopCERN, 16 -18 October 2013 F. Cerutti#, A. Ferrari#, L. Lari*, A. Mereghetti# #EN Dept. & *BE Dept.

  2. Outline • A few reminders about Synchrotron Radiation • FLUKA implementation • Some geometrical considerations • Results • Conclusions & Future works Luisella Lari - Sixth TLEP workshop

  3. SR Emission Presented by A. Ferrari at the 4th TLEP workshop (April 2013) Luisella Lari - Sixth TLEP workshop

  4. SR Emission Luisella Lari - Sixth TLEP workshop

  5. Fluka implementation of SR For more details see A. Ferrari at the 4th TLEP workshop (April 2013) Luisella Lari - Sixth TLEP workshop

  6. Assumed parameters • Ee- =175 GeV 80km machine; • Radius at the dipole = 9.8 km  81% Bending Magnets; • Ecrit= 1.21 MeV; • E= 9 GeV/turn, • dE/ds=1.39 keV/cm in the dipoles • P = 9 x I[mA] MW = 9 x 10mA = 90 MW in the whole accelerator; • dP/ds=1.39 x I[mA] W/cm in the dipoles • SR photons generated and tracked above 100 eV (99.999% of the total power), average energy of the photons <E>=400 keV (E>100 eV) ; Luisella Lari - Sixth TLEP workshop

  7. The starting idea Presented by A. Ferrari at the 4th TLEP workshop (April 2013) Luisella Lari - Sixth TLEP workshop

  8. Preliminary layout of 1 FODO cell for TLEP 50 cm Sext. 50 cm Sext. 50 cm Sext. 50 cm Sext. 1.5m Quad. 1/2 Quad. 1/2 Quad. ~21.3m long dipole ~21.3m long dipole Circumference of 80km !!! Courtesy B. Holzer Luisella Lari - Sixth TLEP workshop

  9. Preliminary layout of 1 FODO cell for TLEP 50 cm Sext. 50 cm Sext. 50 cm Sext. 50 cm Sext. 1.5m Quad. 1/2 Quad. 1/2 Quad. ~21.3m long dipole ~21.3m long dipole 1.5m Quad. 10.5m Dipole 10.5m Dipole 10.5m Dipole 10.5m Dipole 50 m Note that Sextupoles were not yet considered in the actual Fluka model 50m -4*10.5m -2*1.5m -4*0.5m= 3 m 3/10 =0.3m each interconnect Luisella Lari - Sixth TLEP workshop

  10. Preliminary layout 2 proposed materials for the beam pipe 30 cm EPOXY Updated cooling H2O channel 30 cm Courtesy A. Milanese ID 16mm Not yet an available quad. design  but the B yes! Courtesy B. Holzer Courtesy R. Kersevan Luisella Lari - Sixth TLEP workshop

  11. 10.5 m long dipole for 1 Beam line TLEP 80 km Beam pipe without shielding (no lead) but with cooling water channel Luisella Lari - Sixth TLEP workshop

  12. FLUKA model: summarizing 1.5m Quadrupole implemented just as the analytical magnetic field 10.5m Dipole QD 10.5m Dipole S S 0.3 m 0.3 m 0.3 m 0.3 m Centered 5* 24cm long Absorbers Cu-OFS (0.085% Ag) 0.3 m 25 mm (20:10) Lead Luisella Lari - Sixth TLEP workshop

  13. Total power All results take into account a Beam current = 10 [mA] Luisella Lari - Sixth TLEP workshop

  14. H2O channel • Power in the H20 for all the ABSORBERS: 14.7 W(shield) and  4.5 W(no shield) • Power in the H20 for all the MAGNETS:6.7 W(shield) and 87 W (no shield) Q Dipole Dipole Abs Abs Abs Abs Abs S S 39 W 42 W 6 W 0.9 W 0.9 W 0.9 W 0.9 W 0.9 W 1.7 W 4.9 W 0.1 W 7 W 7.2 W 0.16 W 0.2 W 0.05 W Heating of the in-pipe shield: need to move the H2O channel further in ? Luisella Lari - Sixth TLEP workshop

  15. Power density in the dipole beam-pipe Averaged along the Dipole length Luisella Lari - Sixth TLEP workshop

  16. Peak power density in the dipole beam-pipe Dipole length [cm] Luisella Lari - Sixth TLEP workshop

  17. Dose in the coils Averaged along the Dipole length Luisella Lari - Sixth TLEP workshop

  18. Peak Dose on the coils Mask? Luisella Lari - Sixth TLEP workshop

  19. Ozone production Adapted from NCRP Report 51, under the assumption of no O3 dissociation over the air renewal time vent : Corrosion of the materials? For example, for P=10 W, V108 cm3, vent10 h  at saturation CO312 ppm Luisella Lari - Sixth TLEP workshop

  20. Conclusions • For SR emission the effects of absorbers were shown for the 80km TLEP option. • A considerable reduction of the power deposited into the dipoles, in particular thanks to the absorbers immediately downstream of the dipoles. • Not a critical integrated energy into the water channels with and without absorbers. • A factor of 10 difference with and without absorbers for the power density in the dipole beam pipe and for the dose on the coils. Masks? • Ozone production has to be carefully considered for limiting the corrosion of the materials. Limits? Luisella Lari - Sixth TLEP workshop

  21. Future work • Possible follow-up: • Other magnets design for dipoles, quadrupoles and sextupoles. • Following impedance considerations, an updated version of the in-pipe shielding with possible different integration of the water cooling channel into the absorbers. • Changing the orientation of the dipoles could be a gain for the ozone but not for the coils. See also L. Rossi at the 3rd TLEP workshop (January 2013) TLEP 80 km Luisella Lari - Sixth TLEP workshop

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