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Simulations of combined IR3 cleaning without DS collimators

Simulations of combined IR3 cleaning without DS collimators. Luisella LARI In collaboration with FLUKA & Collimation teams BE/ABP/LCU IFIC & CERN CWG 26 September 2011. Summary. Presented @IPAC11. Definition of the parameters selected for the IR3 combined cleaning Results from SixTrack

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Simulations of combined IR3 cleaning without DS collimators

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  1. Simulations of combined IR3 cleaning without DS collimators Luisella LARI In collaboration with FLUKA & Collimation teams BE/ABP/LCU IFIC & CERN CWG 26 September 2011

  2. Summary Presented @IPAC11 • Definition of the parameters selected for the IR3 combined cleaning • Results from SixTrack • Results from FLUKA • Conclusions NB: This is 1 of the possible layouts, that mitigate the risks of SEU @ Point 7 SCOPE is to evaluate the effect of this new layout, and to identify possible critical points along SS3

  3. Definition • New layout at Point 3  5 additional vertical collimators for each beam line (=1 TCP + 4 TCSG) • New aperture layout in all LHC machine @ 3.5 TeV @ 7 TeV

  4. Results from SixTrack • Loss maps along the whole LHC ring have been produced under the hypothesis of perfect LHC machine. • Total of 4 scenarios were studied separately for each beam energy: all losses due to a so called “sheet beam halo” distribution concentrated in the first “vertical” or “horizontal” primary IR3 collimator. • A fractional energy spread of 1.129E-4 was taken into account for all the scenarios studied. Cut @ y max

  5. Results from SixTrack @ 7 TeV @ 3.5 TeV HORI. VERT.

  6. Results from FLUKA PASS ABS already in 1 m active length IP3 IR3 Straight Section FLUKA model developed by the FLUKA team MBW PASS ABS added 0.6 m active length MQW PASS ABS added 0.2 m active length

  7. Results from FLUKA Total Power deposition [kW] 1h beam lifetime 2808 bunches with 1.15E11 @ 7TeV – vertical scenario Cut @ y max The effectiveness of the proposed PASS ABS is limited (about 10% in average) in order to reduce the total power dep. in each downstream element if compared to the case without them.

  8. Results from FLUKA ……..but if looking to the annual dose peaks in the warm magnet coils @ 1.465E16 proton losses per year (Ref. M.Lamont Project note 375,2005)

  9. Conclusions • Moving the Betatron Cleaning in Point 3 has as consequence not only a reduction of the LHC Cleaning Efficiency but also additional constraints such as an increment of the annual dose to the resistive magnets close to primary or secondary collimators. • In case of moving all the BetatronClening in Point 3, a factor of about 2 in reduction of the peak dose was calculated as function of the location of 2 additional passive absorbers in the present LHC layout.  This factor could also be improved by optimizing the length of PASS ABS. • The FLUKA results have also underlined the critical position of the MQWA.E4R3 installed about 230 m downstream the primary collimators

  10. Conclusions IP3 IR3 Straight Section FLUKA model developed by the FLUKA team MQWA.E4R3

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