1. 1 IPN Orsay / Division Accélérateurs The Spoke cryomodule Vacuum aspects P. DUTHIL on behalf of the IPNO team ESS Lund February 19 th 2013

2. 2 ESS Lund – Vacuum meeting - February 19 th 2014 Introduction1/3  T HE S POKE SECTION OF THE ESS LINAC CavityFrequency (MHz) Total number of cavities Cavities per cryomodule Section length (m) Double Spoke 35226254m

3. 3 ESS Lund – Vacuum meeting - February 19 th 2014 Introduction2/3  O VERVIEW OF THE S POKE CRYOMODULE Thermal shield Vacuum vessel Cold tuning system Cavity Instrumentation port Tie-rod C/W transition Gate valve RF power coupler Double walled tube Alignment Monitoring lenses Alignment diagnostic window Dished end Burst disk Alignment support Helium level gauge Active Magnetic shielding Cryogenic subcooler Cryogenic valve Alignment target Biphasic pipe Safety valve

4. 4 ESS Lund – Vacuum meeting - February 19 th 2014 Introduction3/3  O VERVIEW OF THE S POKE CRYOMODULE Global dimensions : Length : 2.86m Diameter : 1.3m Weight : 2300kg

5. 5 ESS Lund – Vacuum meeting - February 19 th 2014  V ACUUM PID Vacuum PID1/1 Beam vacuum (p< 10 -9 mbar) Insulation vacuum (p< 10 -5 mbar) Cryogenic distribution Penning gauge S POKE CRYOMODULE PT 808 PT 808 PT 808 PI 808 Two position valve Control valve Pressure safety valve Secondary vacuum pump PT 808 Pressure transmitter PI 808 Pressure indicator Legend: Primary vacuum pump PT 808 Rotary vane pump Turbomoleular pump Relief plate Manometer Gate valve Pirani + penning gauges (combined… no spec needs)

6. 6 ESS Lund – Vacuum meeting - February 19 th 2014  S OME FEATURES Beam vacuum (p< 10 -9 mbar) 1/3 Total volume: 246 L Internal surface: 4.1 m² Internal surface minimum quality:Chemical etching, HPR Interfaces: - cold: 14 x CFDN40, 6 x CFDN63, 4 x CFDN100 (facing vacuum) - warm: 2 x CFDN63, 2 x CFDN100 (facing P atm ) - all with copper gaskets

7. 7 ESS Lund – Vacuum meeting - February 19 th 2014  T HE GATE VALVES VAT48: 48236-APJ1 Pneumatic 2 positions with indicators Electrovalve can be placed (far) away from the cryomodule (radiation) VAT48: 48236-APJ1 Beam vacuum (p< 10 -9 mbar) 2/3

8. 8 ESS Lund – Vacuum meeting - February 19 th 2014 Control command can be removed for cryostating (valve is blocked in closed position and leaktight)  T HE GATE VALVES Standard (small) dish end on the beam pipe Standard dish end to close the vacuum vessel Beam vacuum (p< 10 -9 mbar) 3/3

9. 9 ESS Lund – Vacuum meeting - February 19 th 2014  V ACUUM VESSEL Interfaces: Polymer O-rings (material TBD): 2 x OR1200x6.99 (TBC) 2 x OR506.86x6.99 2 x OR395x6 2 x OR322x5 2 x ISOKDN400 3 x ISOKDN250 1 x ISOKDN320 4 x ISOKDN160 6 x ISOKDN100 12 x ISOKDN63 52 x ISOKDN40 L~28.75 m (prototype) Insulation volume : ~ 2 870 L (volumes of internal components removed) Internal surface: ~ 17.1 m² Internal surface quality: stainless steel, assembly hall cleanness; oil free Cryomodule volume : ~ 3 250 L Pumping port: ISOK DN100 Insulation vacuum (p< 10 -5 mbar) 1/4

10. 10 ESS Lund – Vacuum meeting - February 19 th 2014  T HERMAL SHIELD (50 K) Surface: ~ 19 m² (2 sides = recto/verso) Surface quality:Aluminum; assembly hall cleanness; possible presence of vac. grease (sensors), ~ 9.5m² covered with MLI (30 layers)  570 m² Insulation vacuum (p< 10 -5 mbar) 2/4

11. 11 ESS Lund – Vacuum meeting - February 19 th 2014  C OLD MASS (2K) String of cavities Magnetic shield External surface: ~ 5 m² External surface quality: assembly hall cleanness; possible presence of vac. grease (sensors), ~ 5 m² covered with MLI (10 layers)  100 m² Surface: ~ 7.1 m² (2 x metal sheets layers, 4 x half shells, 2 x flat ends  recto/verso) Surface quality: assembly hall cleanness; possible presence of vac. grease (sensors), NOT covered with MLI Insulation vacuum (p< 10 -5 mbar) 3/4

12. 12 ESS Lund – Vacuum meeting - February 19 th 2014  C OLD MASS (2-5 K) Cryogenic distribution (may be subjected to small changes) Internal Volume (to be pumped and He conditioned): ~137 L External surface: ~1 m² External surface quality: stainless steel, assembly hall cleanness; possiblepresence of vac. grease (sensors), ~ 1 m² covered with MLI (10 layers)  20 m² Insulation vacuum (p< 10 -5 mbar) 4/4

13. 13 ESS Lund – Vacuum meeting - February 19 th 2014  G ASES Needs1/1 Helium (or other gases) for leak testing? Compressed air for electro-pneumatic valve actuation Helium and pumps for cryogenic distribution conditioning (Ultra pure) nitrogen and filtering system for cavities (re)fill in  O THERS  cf. Presentation of Pierre BOSLAND Medium & High Beta cryomodules

14. 14 ESS Lund – Vacuum meeting - February 19 th 2014  W HAT SHOULD ( SHALL ) BE DISCUSSED Insulation vacuum Pump down time O-ring material Out-gassing, permeation values (for sizing) Instrumentation/signal feedthroughs (warm and cold) Sensors ( general subject) Beam vacuum No sensors except for the coupler (vacuum gauge and pick-up) Pumping system: - for the prototype tests  CNRS - for the machine  ESS Procedures (to defined requirements) Especially if related to the cavities Cryogenic distribution Internal sensors: LHe level gauges only (see insulation vacuum) Helium guard Conclusion 1/1