1 / 19

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

tola
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related