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LIU SPS Beam Scraping System Preliminary S tudies of New D esign and M aterials

LIU SPS Beam Scraping System Preliminary S tudies of New D esign and M aterials. LIU-SPS, Beam Loss, Protection, Transfer Lines Working Group Meeting. Maciariello Fausto Lorenzo 22/01/2013. Scraper History. Two orientations, two axis scrapers in LSS 1 and LSS 5

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LIU SPS Beam Scraping System Preliminary S tudies of New D esign and M aterials

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  1. LIU SPS BeamScraping System PreliminaryStudies of New Design and Materials LIU-SPS, Beam Loss, Protection, Transfer Lines Working Group Meeting Maciariello Fausto Lorenzo 22/01/2013

  2. Scraper History • Two orientations, two axis scrapers in LSS 1 and LSS 5 • Used during operations more intensively with LHC beams • Fast mechanical movements with risk of failure • Limited lifetime of edge-welded bellows • Polluting the machine, additional shielding needed (RP) Cycles on 16/01/2012 Cycles on 14/01/2013 Maciariello Fausto Lorenzo (EN-STI-TCD)

  3. 2 Main Topics • Materials: • Graphite R4550; • Boron Nitrite; • CFC 1.4 g/cm3; • CFC 1.7 g/cm3. • The studies are based on the TCDI and TED beam parameters • Design Maciariello Fausto Lorenzo (EN-STI-TCD)

  4. Beam Parameters • Normalised emittance: 1.0um rad; • Sigma delta_p / p: 1.68E-04; • -> sigma_hor: 420um; • -> sigma_ver: 230um; • N_bunch= 288 • N_protons= 1.15E11 per bunch • Pulse_period=15 s • Pulsetime=7.2 microseconds • Init_temp=22 ˚C • Beam_e=450 GeV • TCDI • -> sigma_hor: 405.5 um ; • -> sigma_ver: 230.8 um ; • TDI • -> sigma_hor: 470 um ; • -> sigma_ver: 320 um ; TED Maciariello Fausto Lorenzo (EN-STI-TCD)

  5. Results Graphite R4550Transient Thermal Gradient of Temperature T [˚C ] C A B [m] D • The gradient of temperature is much lower in Z direction then on X and Y • Maximum service temperature around 1800 ˚C.

  6. Graphite R4550 Transient Structural (Compression) • Isotropic/Homogenous/Asymmetric material Stassi’s criterion is needed • Max Compression Stress 142MPa Compressive Yield Strength 125 MPa. • The same study was done for the TED, also in that case Graphite R4550 was not safe. Maciariello Fausto Lorenzo (EN-STI-TCD)

  7. Second Step … ρ[Kg/m3] • Boron Nitrite was picked in our list of best materials. • Limit in compression 5 times the Graphite R4550 • Density only 12% higher. Maciariello Fausto Lorenzo (EN-STI-TCD)

  8. Results Boron Nitride Transient Thermal • Below the Melting point 2270 ˚C • Max temperature reached with graphite R4550 was around 1350˚C • The increasing of the max T it is not linear with the increasing of density T [˚C ] [m] Maciariello Fausto Lorenzo (EN-STI-TCD)

  9. Results Boron Nitride Transient Structural (Compression) • Stassi’s Criterion: • Limit in Compression 512 Mpa – Maximum Compression Stress700 Mpa • Limit in Traction 29 Mpa – Maximum Traction Stress105Mpa • The key is the density Maciariello Fausto Lorenzo (EN-STI-TCD)

  10. Results CFC 1.4Transient Thermal • Max service temperature for CFC around 2000 ˚C (under vacuum). • Below the Max service temperature. T [˚C ] [m] Maciariello Fausto Lorenzo (EN-STI-TCD)

  11. Results CFC 1.4Transient Structural (Compression) • Anisotropic/Non Homogenous/Asymmetric material Max/Min stress’s criterion is needed • Maximum /Minimum Stress’ Criterion: • Limit in Compression (along z) 82.4 Mpa – Maximum Compression Stress45Mpa(Safety factor =1.82) • Remind !!! • We are not taking into account the Dynamic Stresses. Maciariello Fausto Lorenzo (EN-STI-TCD)

  12. Results CFC 1.7Transient Thermal • Max service temperature for CFC around 2000 ˚C (under vacuum). • Below the Max service temperature. T [˚C ] [m] Maciariello Fausto Lorenzo (EN-STI-TCD)

  13. Results CFC 1.7Transient Structural (Compression) • Anisotropic/Non Homogenous/Asymmetric material Max/Min stress criterion is needed • Maximum /Minimum Stress’ Criterion: • Limit in Compression132 Mpa – Maximum Compression Stress 31Mpa(safety factor =4.25) Maciariello Fausto Lorenzo (EN-STI-TCD)

  14. Reminder: • Best material in terms of ratio σlim/ σmax is CFC1.7 • BN from CESselector, CFC RNFF-SG 1.4 and 1.7 g/cm3 have been used for TCDS Collimator (Sintec) • Dynamic effects and scraping conditions still to take into account. Maciariello Fausto Lorenzo (EN-STI-TCD)

  15. Design Options – Passive Scraper • Low density materials, thermal extension small • Brazing techniques not adequate Go for a clamped solution • Collimator design • without cooling (TCDI type) or with cooling (TCS type) Maciariello Fausto Lorenzo (EN-STI-TCD)

  16. Angle Dependence Analyze the need to provide the scraping system of movements for the alignment with the beam Maciariello Fausto Lorenzo (EN-STI-TCD)

  17. Design Options • Depending on needs, capacity of movements can be provided • Depending on cooling needs, an insert design can be provided Courtesy K. Ilinov / M. Furtinger for Medaustron Maciariello Fausto Lorenzo (EN-STI-TCD)

  18. Actions to do… • Materials Point of View: • LIU Parameters for the Scraping system. • Dynamic effect still to take into account. • Design Point of View • Angle/ Alignment effect • Cooling System • Additional shielding needed (RP) Maciariello Fausto Lorenzo (EN-STI-TCD)

  19. Thank You for Your Attention • Any questions ? Maciariello Fausto Lorenzo (EN-STI-TCD)

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