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Vacuum Analysis of PS Sector 20

Vacuum Analysis of PS Sector 20. C. Pasquino, P. Chiggiato, J. Hansen, P. R. Demarest. outline. PS sector 20 : vacuum layout Electrical Network – Vacuum analogy: principles Vacuum simulations & results Conclusions & accomplishments Acknowledgements. PS sector 20 vacuum layout.

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Vacuum Analysis of PS Sector 20

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  1. Vacuum Analysis of PS Sector 20 C. Pasquino, P. Chiggiato, J. Hansen, P. R. Demarest MTE meeting - 13th September 2012

  2. outline • PS sector 20 : vacuum layout • Electrical Network – Vacuum analogy: principles • Vacuum simulations & results • Conclusions & accomplishments • Acknowledgements MTE meeting - 13th September 2012

  3. PS sector 20 vacuum layout • 16 Sputter Ion Pumps (SIP) 220 l/s; • 5 Penning gauges : VGP13, VGP13a, VGP16, VGP17, VGP18. Goal: to evaluate how the installation of the dummy 15 is going to affect the pressure profile in the PS ring MTE meeting - 13th September 2012

  4. Electrical Network – Vacuum Analogy: principles Qin MTE meeting - 13th September 2012

  5. Electrical Network – Vacuum Analogy:dummy15 conductance calculation MOLFLOW* • T temperature; • R gas constant; • Mm molecular mass; • Area of the entrance; • α transmission probability; MTE meeting - 13th September 2012 *program written by R. Kersevan

  6. Electrical Network – Vacuum Analogy: outgassing data E. Mahner, PRST • The desorption yield depends on: • the nature of the ion; • Its energy; • Its angle of impingment; • Temperature of the substrate; • Dose (cleaning effect). Measurements on protons by W. Fischer (Brookhaven National Labs) show a < 1. Safety factor of 10 has been considered for the simulations. • Non baked vacuum line: water vapor outgassing • Hydrogen outgassing (200-300 h of pumpdown) • Beam losses: Ion Induced Desorption H2, CO, CO2,CH4 MTE meeting - 13th September 2012

  7. Equivalent Electrical Network – sector 20 MTE meeting - 13th September 2012

  8. PS sector 20 simulations: present situation Case Study: intervention on Septum 16, January 2012 12 days H2O + H2 1*10-9 mbar No beam losses induced total pressure rise MTE meeting - 13th September 2012

  9. PS sector 20 simulations: INSTALLATION OF DUMMY 15 No beam losses induced total pressure rise MTE meeting - 13th September 2012

  10. DUMMY 15 INSTALLATION: ACTIONS AND CONCLUSIONS • The simulations shows that the installation of dummy 15 is not going to have a major impact on PS sector 20 pressures profiles; • The installation of extra pumping group is not needed: the current vacuum system is going to cope with the gas loads coming from the dummy 15; • Contingency: installation of a blind flange in case of future need. Acknowledgements: M. Hourican, J.-M. Lacroix, S. Damjanovic, S. Gilardoni. MTE meeting - 13th September 2012

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