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PAST ESTIMATIONS ON THE ROLE OF PASSIVE ABSORBERS

PAST ESTIMATIONS ON THE ROLE OF PASSIVE ABSORBERS. Francesco Cerutti for the team. 2012 June 4th. OUTLINE. warm magnets and passive absorbers IR7 betatron cleaning IR3 combined cleaning considerations for IR3 momentum cleaning. s. h. v. s. beam 1. IP7. TCP .D C B 6 L7.B1.

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PAST ESTIMATIONS ON THE ROLE OF PASSIVE ABSORBERS

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  1. PAST ESTIMATIONS ON THE ROLE OF PASSIVE ABSORBERS Francesco Cerutti for the team 2012 June 4th

  2. OUTLINE • warm magnets and passive absorbers • IR7 betatron cleaning • IR3 combined cleaning • considerations for IR3 momentum cleaning

  3. s h v s beam 1 IP7 TCP.D C B 6L7.B1 TCAPA MQW MBW

  4. for the MQW [M. Karppinen quoted by M. Brugger @CWG#89] IN IR7

  5. IR7 BETATRON CLEANING with 3 passive absorbers per beam beam 1 horizontal halo beam pipe heating TCAPA B C TCAPA B C F. Cerutti @CWG#108 for intermediate collimator settings coil deterioration peak dose for 1.15 1016 lost protons per beam

  6. IR7 BETATRON CLEANING SLAC prototype with an additional metallic collimator [L. Lari] for 1.15 1016lost protons per beam at 7 TeV (beam 1 horizontal halo) F. Cerutti Conceptual Design Review Phase II Collimation April 2009

  7. IR3 COMBINED CLEANING with 1 passive absorber per beam beam 1 h v v h and additional vertical collimators for 1016lost protons per beam at 7 TeV (beam 1 horizontal halo) M. Mauri R2E Meeting July 17th 2008

  8. IR3 COMBINED CLEANING TCP. 6 MQWA.E D 5 TCAPA MBW.C B A 6 TCSG. 5 MQWA.C5 IP3 v h v h with two additional passive absorbers per beam: TCAPC TCAPB for 1016lost protons per beam (beam 1 vertical halo) high peak also on MQWA.E4R3, just downstream of a pair of (h-v) collimators L. Lari CERN-ATS-2001-117 (IPAC 2011)

  9. IR3 MOMENTUM CLEANING how many losses? [see Mike’s talk] Over 2011, the TCP BLM in P3 gives almost a factor of 2 difference between beam 1 and beam 2 Looking at the P3/P7 sharing, wrt to the first TCP BLM in P7 (vertical collimator quite doubtful assumption), one gets a factor of 3.5 for beam 1 and a factor of 1.15 for beam 2 FLUKA geometry of IR3 rapidly available, thanks to the new FLUKA Element DataBase and LineBuilder which loss maps? (and corresponding collimator settings) readings of passive dosimeters installed 4 months ago in the locations suggested on purpose (attached to the beam pipe and the MBW external coils, being not accessible the concerned internal MQW coils), are expected to provide during LS1 relevant data and related benchmarking opportunities [data kindly extracted by P. Mala and M. Calviani]

  10. CONCLUSIONS Guessed peak dose values in the MQWA.E-C5 L3.B1/R3.B2 (and possibly MQWA.E4 R3.B1/L3.B2) are not reassuring Dedicated shower calculations for the standard IR3 momentum cleaning scenario were not performed, and can in principle – after clarifying loss maps and normalization assumptions - be launched (manpower shortage will be overcome by the autumn) Dedicated measurements have been put in place (with Pierre Thonet, Davide Tommasini, Julia Trummer) and dosimeter reading could be carried out at LS1 The activation of the area (see Stefan’s talk) challenges a late TCAP installation

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