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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 . . - PowerPoint PPT Presentation
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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.
Vacuum, Surfaces & Coatings GroupTechnology Department
Pedro Costa Pinto, CLIC workshop 2014, CERN.
1 Brief introduction to MAX IV
2 The vacuum system
3 CERN contribution (phases 1,2 and 3)
4 Summary
OUTLOOK
Vacuum, Surfaces & Coatings GroupTechnology Department
1 Brief introduction to MAX IV“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.”
https://www.maxlab.lu.se/node/1055
2015
“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.”
https://www.maxlab.lu.se/node/1385
2013
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum, Surfaces & Coatings GroupTechnology Department
1 Brief introduction to MAX IV“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.”
https://www.maxlab.lu.se/node/1055
2015
“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.”
https://www.maxlab.lu.se/node/1385
“…It is also a very energy efficient facility due to the technical design of the accelerator and the buildings.”
“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.”
“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.”
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum, Surfaces & Coatings GroupTechnology Department
1 Brief introduction to MAX IV
https://www.maxlab.lu.se/node/1055
Circumference (m) 528
Nr of straight sections 20
Injection full energy, top-up
Stored current (mA) 500
Horizontal emittance (nm rad) 0.2 - 0.3
Vertical emittance (nm rad) < 0.008
Horizontal beam size (σ µm) 42- - 52
Vertical beam size (σ µm) < 6
3 GeV ring20 SECTORS (ACHROMATS)
1 23
456
789101112
1314
151617
1819 20
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum, Surfaces & Coatings GroupTechnology Department
2 The vacuum system
CERN – MAX IV collaboration on the design/construction of vacuum chambers
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Limited space for vacuum pumps
NEG coating
Cu chambers NEG coated
Bellows welded to the chamber => difficult to clean
Narrow gap antechambers hard to coat
Vacuum, Surfaces & Coatings GroupTechnology Department
2 The vacuum system
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum, Surfaces & Coatings GroupTechnology Department
2 The vacuum system
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum, Surfaces & Coatings GroupTechnology Department
2 The vacuum system
Standard vacuum chambers
Distributed cooling
Ribs
Cooling for corrector
area
Cooling for corrector area
Welded bellows
Welded bellows
Chamber body
Inside diameter: 22 mm, Total length: 2.5 m,
Bent part: Arc length 1 m, Bending angle 30, Bending radius 19 m.
Beam direction
Bent part
U1, VC3
Beam direction
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum, Surfaces & Coatings GroupTechnology Department
2 The vacuum system
complex vacuum chambers
Beam direction
Pedro Costa Pinto, CLIC workshop 2014, CERN.
VC1
VC2A
VC2BVC2L
Vacuum, Surfaces & Coatings GroupTechnology Department
2 The vacuum system
complex vacuum chambers
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Vacuum chamber for emittance measurement
Vacuum, Surfaces & Coatings GroupTechnology Department
3 phases:
3 CERN contribution
ID 22 mm
Pedro Costa Pinto, CLIC workshop 2014, CERN.
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.
Phase 3: Coat at CERN the complex chambers.
Vacuum, Surfaces & Coatings GroupTechnology Department
1- Define the type of Cu for the beam pipes: OFS (resistance to thermal cycling, as for the Long Straight Sections of the LHC)
3 CERN contribution: phase 1
2- Define surface treatment procedures to ensure compatibility between the assembling techniques and the NEG coating.
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.
Vacuum, Surfaces & Coatings GroupTechnology Department
1- Define the type of Cu for the beam pipes: OFS (resistance to thermal cycling, as for the Long Straight Sections of the LHC)
3 CERN contribution: phase 1
2- Define surface treatment procedures to ensure compatibility between the assembling techniques and the NEG coating.
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);
ID 22 mm
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Courtesy Marek Grabski, MaxLab.
thickness distribution OKComposition OK
Activation OKPumping speed OK
ID 22 mmcompleted
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 2
Pedro Costa Pinto, CLIC workshop 2014, CERN.
5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber.
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 2
Pedro Costa Pinto, CLIC workshop 2014, CERN.
5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber.
thickness distribution OKComposition OK
Activation “delayed” in the photon antechamber => under investigation
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 2
Pedro Costa Pinto, CLIC workshop 2014, CERN.
5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber.
6- evaluate compatibility of mechanical assembly techniques with NEG coating: on wire eroded parts and on brazing.
NEG-coatingWire eroded chamber tested: OK (adhesion + activation).
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 2
Pedro Costa Pinto, CLIC workshop 2014, CERN.
5- develop coating technology for complex chambers: on going; problems with “delayed activation” in photon antechamber.
6- evaluate compatibility of mechanical assembly techniques with NEG coating: on wire eroded parts and on brazing.
Copper-Copper brazing:adhesion OK
activation: NOT ACTIVATED(strong carbon contamination and Si; origin not yet
clarified; sample manipulation?)
Copper-Stainless Steel brazing:adhesion OK
activation not tested because the sample was manipulated the same way as the copper-
copper brazing.
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 3
Pedro Costa Pinto, CLIC workshop 2014, CERN.
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.
VC1 and VC2L will be coated in the systems for the LHC => in concurrence with LS1(priority given to LS1 activities!)
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 3
Pedro Costa Pinto, CLIC workshop 2014, CERN.
VC2A and VC2B will have a dedicated coating system (under construction)
VC2AVC2B
VC1 and VC2L will be coated in the systems for the LHC => in concurrence with LS1(priority given to LS1 activities!)
7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the production foreseen for March.
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 3
Pedro Costa Pinto, CLIC workshop 2014, CERN.
WeeksFEBRUAR
Y6
7 8 9 MARS10 11
VCa-b Pumping system
First test on two plates
XPS analysis Test XPS
analysis
VC2l Test hollow cathode
XPS Activation
First chamber Production
VC1 Drawing of supports(Max IV team) Building supports
12 13 April14 15 16 17
Neg Coating of extension
Construction of the table
Production(XPS ok)
Production
Production
Weeks
May18 19 20 21 22 June
23
VCa-b Production
VC2l Production END
VC1 Production
24 25 26 July27 28 29
Productin END
Production
30 32Augus
t32
33 34 35
Production
WeeksSeptemb
er36
37 38 39 October40 41
VCa-b
VC2l
VC1 Production
42 43Novemb
er44
45 46 47
Production END
7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the production foreseen for March.
Vacuum, Surfaces & Coatings GroupTechnology Department
3 CERN contribution: phase 3
Pedro Costa Pinto, CLIC workshop 2014, CERN.
8- Assist MAX IV for the activation of the NEG in the ring.
7- coating of the complex chambers at CERN (21xVC1 + 21xVC2A + 21xVC2B + 21xVC2L + 1x chamber for emittance measurements). Beginning of the production foreseen for March.
Vacuum, Surfaces & Coatings GroupTechnology Department
3 Summary
Pedro Costa Pinto, CLIC workshop 2014, CERN.
Phase 1 was completed: all tubes treated at CERN and know how for standard chambers transferred.
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.
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.
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
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.