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Vacuum Pressure Calculations

Vacuum Pressure Calculations. Vaccalc. The program vaccalc was used for all calculations. The program required three pieces of information for each chamber: pumping, conductance, and outgassing.

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Vacuum Pressure Calculations

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  1. Vacuum Pressure Calculations

  2. Vaccalc • The program vaccalc was used for all calculations. • The program required three pieces of information for each chamber: pumping, conductance, and outgassing. • Using the given information, the program calculates the pressure at any point along the entire tube.

  3. Chamber Design 3 69.33 m HER downstream LER downstream 4 plot plot Q5 NEG ST plot 2 1 Support chamber Q5 NEG plot plot 5 6 LER upstream HER upstream 66.114 m

  4. Assumptions • Bertollini’s numbers on outgassing were true. • 2000 (l/s)/m pumping for all NEG pumps with B or C screens. • 1000 (l/s)/m pumping for all NEG pumps with A or D screens • 1000 (l/s)/m pumping for all ion pumps (150 l/s pump over 0.15 m)

  5. Data • Conductance remains a constant throughout the LER tubes. • Lengths were taken from drawings and tables. • This is a work in progress, making it difficult to draw final conclusions from the plots.

  6. Cases • Baseline Design • No Radial Pumps • No C Pumps • No Upstream Q4 Pump • No Q4 pump with Ion pump • LER Q5 not pumping • LER Q5 outgassing • No Q4 pump with Ion pump and frangible pump • LER Q5 not pumping with Frangible Link Pump • LER Q5 outgassing with Frangible Link Pump • No C Pumps • Q4 and Q5 outgassing • No Q4 and Q5 outgassing

  7. Baseline Design (Support Tube)

  8. Upstream HER

  9. Upstream LER

  10. Downstream HER

  11. Downstream LER

  12. No radial pumps

  13. No C Pumps Upstream (support tube)

  14. Upstream LER

  15. No Upstream Q4 Pump (support tube)

  16. Upstream LER

  17. No Q4 pump with ion pump

  18. Q5 not pumping

  19. Q5 Outgassing

  20. No Q4 pump with ion and frangible pump

  21. Q5 not pumping with Frangible Link Pump

  22. Q5 outgassing with Frangible Link Pump

  23. No C Pumps Upstream (support tube)

  24. Upstream LER

  25. Q4 and HER Q5 outgassing(support tube)

  26. Upstream HER

  27. Upstream LER

  28. No Q4 and HER Q5 outgassing(support tube)

  29. Upstream HER

  30. Upstream LER

  31. Next Steps • Test other possible combinations • Finish the HER • Upstream • Downstream • Recalculate outgassing numbers • Check pump speed numbers • screen conductances

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