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CERN, February 2014

CERN-MAX IV collaboration on vacuum design. Pedro Costa Pinto on behalf of the CERN-MAXIV team: S. Calatroni , P. Chiggiato , L. Ferreira, M. Mensi , D. Letant-Delrieux , S. dos Santos, M. Taborelli , CERN-TE-VSC E. Al Dmour , Marek Grabski , Pedro Tavares, MaxLab . .

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CERN, February 2014

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  1. CERN-MAX IV collaboration on vacuum design Pedro Costa Pinto on behalf of the CERN-MAXIV team: S. Calatroni, P. Chiggiato, L. Ferreira, M. Mensi, D. Letant-Delrieux, S. dos Santos, M. Taborelli, CERN-TE-VSC E. Al Dmour, MarekGrabski, Pedro Tavares, MaxLab. CERN, February 2014

  2. OUTLOOK Brief introduction to MAX IV The vacuum system CERN contribution (phases 1,2 and 3) Summary 1 2 3 4 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  3. “The MAX IV source will be the most brilliant synchrotron light source in the World and will by far exceed the performance of other third generation synchrotron radiation facilities.” “MAX IV sources will, in particular, facilitate imaging and microscopy methods with unprecedented spatial resolution and simultaneous sensitivity to chemical, electronic, geometric, magnetic, etc. structure.” Brief introduction to MAX IV 1 https://www.maxlab.lu.se/node/1055 2015 2013 https://www.maxlab.lu.se/node/1385 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  4. “The MAX IV source will be the most brilliant synchrotron light source in the World and will by far exceed the performance of other third generation synchrotron radiation facilities.” “MAX IV sources will, in particular, facilitate imaging and microscopy methods with unprecedented spatial resolution and simultaneous sensitivity to chemical, electronic, geometric, magnetic, etc. structure.” Brief introduction to MAX IV 1 https://www.maxlab.lu.se/node/1055 “…It is also a very energy efficient facility due to the technical design of the accelerator and the buildings.” 2015 “The total power consumption of magnets in the 3 GeV MAX IV is about half of that in the MAX II ring even though the MAX IV facility is five times bigger.” “The smaller magnets, the lower frequency used in the RF cavities and the NEG coating in the storage rings makes the MAX IV less energy consuming than any other synchrotron.” https://www.maxlab.lu.se/node/1385 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  5. 20 1 19 2 18 3 17 Brief introduction to MAX IV 4 1 16 5 15 6 14 7 13 8 9 12 11 10 https://www.maxlab.lu.se/node/1055 20 SECTORS (ACHROMATS) 3 GeV ring Pedro Costa Pinto, CLIC workshop 2014, CERN.

  6. Limited space for vacuum pumps The vacuum system 2 Bellows welded to the chamber => difficult to clean Narrow gap antechambers hard to coat Cu chambers NEG coated NEG coating CERN – MAX IV collaboration on the design/construction of vacuum chambers Pedro Costa Pinto, CLIC workshop 2014, CERN.

  7. The vacuum system 2 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  8. The vacuum system 2 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  9. U1, VC3 Welded bellows Standard vacuum chambers Chamber body The vacuum system 2 Beam direction Cooling for corrector area Inside diameter: 22 mm, Total length: 2.5 m, Bent part: Arc length 1 m, Bending angle 30, Bending radius 19 m. Ribs Welded bellows Distributed cooling Bent part Cooling for corrector area Pedro Costa Pinto, CLIC workshop 2014, CERN. Beam direction

  10. VC2L VC2B complex vacuum chambers The vacuum system 2 VC1 VC2A Beam direction Pedro Costa Pinto, CLIC workshop 2014, CERN.

  11. complex vacuum chambers Vacuum chamber for emittance measurement The vacuum system 2 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  12. 3 phases: CERN contribution 3 Phase 1: Define global strategy and prepare the route for the production of standard chambers by licensed companies/institutes. Phase 2: R&D to set coating procedure/technology for the complex chambers and compatibility with manufacturing techniques. ID 22 mm Phase 3: Coat at CERN the complex chambers. Pedro Costa Pinto, CLIC workshop 2014, CERN.

  13. 1- Define the type of Cufor the beam pipes: OFS (resistance to thermal cycling, as for the Long Straight Sections of the LHC) 2- Define surface treatment procedures to ensure compatibility between the assembling techniques and the NEG coating. CERN contribution: phase 1 3 3- Degreasing, etching and quality control of the 300 copper tubes before start mechanical assembling. ID 22 mm Pedro Costa Pinto, CLIC workshop 2014, CERN.

  14. completed 1- Define the type of Cufor the beam pipes: OFS (resistance to thermal cycling, as for the Long Straight Sections of the LHC) 2- Define surface treatment procedures to ensure compatibility between the assembling techniques and the NEG coating. CERN contribution: phase 1 3 3- Degreasing, etching and quality control of the 300 copper tubes before start mechanical assembling. 4- define coating procedure for standard chambers, coat prototype, measure pumping speed and make know how available to external companies (for series production); thickness distribution OK Composition OK Activation OK Pumping speed OK ID 22 mm ID 22 mm Courtesy Marek Grabski, MaxLab. Pedro Costa Pinto, CLIC workshop 2014, CERN.

  15. 5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber. CERN contribution: phase 2 3 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  16. 5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber. CERN contribution: phase 2 3 thickness distribution OK Composition OK Activation “delayed” in the photon antechamber => under investigation Pedro Costa Pinto, CLIC workshop 2014, CERN.

  17. 5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber. CERN contribution: phase 2 6- evaluate compatibility of mechanical assembly techniques with NEG coating: on wire eroded parts and on brazing. 3 Wire eroded chamber tested: OK (adhesion + activation). NEG-coating Pedro Costa Pinto, CLIC workshop 2014, CERN.

  18. 5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber. CERN contribution: phase 2 6- evaluate compatibility of mechanical assembly techniques with NEG coating: on wire eroded parts and on brazing. 3 Copper-Stainless Steel brazing: adhesion OK activation not tested because the sample was manipulated the same way as the copper-copper brazing. Copper-Copper brazing: adhesion OK activation: NOT ACTIVATED (strong carbon contamination and Si; origin not yet clarified; sample manipulation?) Pedro Costa Pinto, CLIC workshop 2014, CERN.

  19. 7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the coating production foreseen for March. CERN contribution: phase 3 3 VC1 and VC2L will be coated in the systems for the LHC => in concurrence with LS1 (priority given to LS1 activities!) Pedro Costa Pinto, CLIC workshop 2014, CERN.

  20. 7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the production foreseen for March. CERN contribution: phase 3 3 VC2A VC2B VC1 and VC2L will be coated in the systems for the LHC => in concurrence with LS1 (priority given to LS1 activities!) VC2A and VC2B will have a dedicated coating system (under construction) Pedro Costa Pinto, CLIC workshop 2014, CERN.

  21. 7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the production foreseen for March. CERN contribution: phase 3 3 Pedro Costa Pinto, CLIC workshop 2014, CERN.

  22. 7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the production foreseen for March. CERN contribution: phase 3 3 8- Assist MAX IV for the activation of the NEG in the ring. Pedro Costa Pinto, CLIC workshop 2014, CERN.

  23. Phase 1 was completed: all tubes treated at CERN and know how for standard chambers transferred. Summary Phase 2 is reaching the end: coating strategy for complex chambers defined; still under investigation are the delayed activation on photon chamber and the activation of the NEG on the brazing. 3 Phase 3 is in preparation: production shall start in March for VC2L and April for VC2A, VC2B and VC1. End of production foreseen for the end of the year. The overlap of with LS1 activities delayed strongly the R&D and production for MAX IV. (4 months delay) In spite of the LS1, we took the risk to go ahead with this project because it was an opportunity to acquire know how on coating small aperture beampipes. Early the NEG coating is considered in the design phase, smoother and less risky will be the integration of this technology in the fabrication process. Thank you for your attention  Pedro Costa Pinto, CLIC workshop 2014, CERN.

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