1. Vacuum Considerations on ESS-DTL Carlo Roncolato 06/09/2012 Istituto Nazionale Fisica Nucleare Laboratori Nazionali di Legnaro

2. Summary of Considerations

3. Typical DTL Tank Layout (LINAC 4 Example) A. Dallocchio Suitbert Ramberger One available port per module either RF WG or Ion Pump Helicoflex Sealing for Vacuum Tightness & RF Continuity Sealing Features: metal (low outgassing) exchangable (maintenance)

4. Summary of Considerations

5. DTL Tank 2 DTL Tank 1 Surface Estimation Inter-tank End Flange Beam Entrance MEB T All Metal Gate valve Quads Interta nk Sectio n RF Input 65 (+ 2 Halfs) Drift Tubes equipped w/ 33 PMQ (45 mm) Pressure Gauge Inter-module Flange ~ 2 m 652 mm Ion Pump Tank 1 Lateral Surface (Module 1÷ 4) 16.29 m 2 2x End Plates 0.66 m 2 Drift Tubes (66 Cells) 3.46 m 2 Total Copper SurfaceTank1 20.41m 2 PMQ Surface ( 33 Items ) 933 cm 2

6. DTL Tank 3 DTL Tank 2 DTL Tank 4 RF Input 35 (+ 2 Halfs) Drift Tubes equipped w/ 18 PMQ (80 mm) 28 (+ 2 Halfs) Drift Tubes equipped w/ 14 PMQ (80 mm) Ion Pump Tank 2 Lateral Surface (Module 1÷ 4) 15.62 m 2 2x End Plates 0.66 m 2 Drift Tubes (66 Cells) 2.64 m 2 Total Copper SurfaceTank1 18.92m 2 PMQ Surface ( 33 Items ) 955 cm 2 Tank 3 Lateral Surface (Module 1÷ 4) 15.62 m 2 2x End Plates 0.66 m 2 Drift Tubes (66 Cells) 2.64 m 2 Total Copper SurfaceTank1 18.98m 2 PMQ Surface ( 33 Items ) 754 cm 2

7. DTL Tank 4 Spokes Cavities 24 (+ 2 Halfs) Drift Tubes equipped w/ 13 PMQ (80 mm) All Metal Gate valve Pressure Gauge Ion Pump Tank 4 Lateral Surface (Module 1÷ 4) 15.82 m 2 2x End Plates 0.66 m 2 Drift Tubes (66 Cells) 2.13 m 2 Total Copper SurfaceTank1 18.61m 2 PMQ Surface ( 33 Items ) 653 cm 2 DTL Total Copper SurfaceTank1 77 m 2 PMQ Surface ( 33 Items ) 3300 cm 2 Dipole Diag Box

8. PMQ Outgassing Estimation (CERN) G. Vandoni

9. Summary of Considerations

10. Vacuum Equipment Example (CERN) G. Vandoni Target Pressure2.00E-07mbar Port Efficiency60% Tank1Tank2Tank3Tank4 Gas Load 7.35E-057.13E-056.43E-056.01E-05mbar Lt/s Pumping Speed Needed 367356322300Lt/s Pumping Speed to Install 612594536501Lt/s Rough Pumping Speed Estimations

11. Summary of Considerations