First design of a PS2 prototype vacuum chamber Edgar Mahner thanks to Sebastien Blanchard, Cedric Garion, Giuseppe Foffano PS2 meeting, 11.06.2009 1 Edgar Mahner • Main magnet apertures (baseline) • Vacuum chamber geometry for dipoles – optimization parameters – geometry, FE model, behavior under vacuum – first prototype fabrication • Possible bakeout solutions • Conclusions
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Main magnet apertures (baseline) Vacuum chamber geometry for dipoles optimization parameters
First design of a PS2 prototype vacuum chamber Edgar Mahner thanks to Sebastien Blanchard, Cedric Garion, Giuseppe Foffano. Main magnet apertures (baseline) Vacuum chamber geometry for dipoles optimization parameters geometry, FE model, behavior under vacuum first prototype fabrication - PowerPoint PPT Presentation
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Edgar Mahner 1
First design of a PS2 prototype vacuum chamberEdgar Mahner
thanks to Sebastien Blanchard, Cedric Garion, Giuseppe Foffano
PS2 meeting, 11.06.2009
• Main magnet apertures (baseline)• Vacuum chamber geometry for dipoles
– optimization parameters– geometry, FE model, behavior under vacuum– first prototype fabrication
• Possible bakeout solutions• Conclusions
Edgar Mahner 2
PS2 main magnet apertures
• Proposal for outer dimensions of the vacuum system in the main magnets, now including alignment and heating jackets!– Status 16.04.2009 (MB, PS2 meeting)– Dipoles half sizes: 60 mm horizontal, 40 mm vertical– Quadrupoles half sizes: 65 mm horizontal, 45 mm vertical – First consideration for a PS2 prototype dipole vacuum chamber by C. Garion
PS2 meeting, 11.06.2009
Dipole gap:80 120 mm2
Dipole length: 4.20 m
Installation/alignment:≈1 mm (tbs)
Bakeout system:≈5 mm thick (tbs)
Maximum outer dimensions of the dipole vacuum chamber: ≈68 108 mm2
– Safety factor with respect to the yield stress? – But: eddy current forces have to be
estimated during the magnet ramp (1.7 T/s) and considered for the design.
Obtained beam apertures– Vertical 62.7 mm– Horizontal 103.8 mm– not including geometrical
tolerances of the vacuum chamber
= 53.9 mm
= 31
.35
mm
2
C. Garion (April 2009)
Edgar Mahner 6
PS2 prototype vacuum chamber – to be coated
PS2 meeting, 11.06.2009
G. Foffano (June 2009)
Three chambers for coating tests (Cu, a-C, TiZrV)316LN st.st. (2 mm wall thickness)3020 108 68 mm3 (with two DN 150 CF)Reduced length fabrication is possible @ CERN
DRAFTunder discussion with EN-MME
Edgar Mahner 7
PS2 prototype vacuum chamber under vacuum
PS2 meeting, 11.06.2009
G. Foffano (June 2009)
Concept: the vacuum chamber is flat, under vacuum it becomes slightly biconcave small aperture reduction
Edgar Mahner 8
Possible bakeout solutions for PS2 dipoles
PS2 meeting, 11.06.2009
S. Blanchard (June 2009)
Blue: dipole vacuum chamberRed: dipole gap (120 80 mm2)
Blue: dipole vacuum chamberRed: dipole gap (120 80 mm2)
• Conclusions – A 5 mm thin bakeout system, which was a first assumption, needs development work to increase its reliability
(problems found in LHC (warm magnets) with 4.3 mm system); a 6.7 mm thin bakeout system is o.k. (good experience, e.g. in LEIR).
– A 1 mm gap between the bakeout equipment and the dipole magnet seems (too) small, risk to damage it during closure of the upper magnet cover.
– Important assumption (agreed with GdR): bolted-type PS2 dipoles and quadrupoles, avoids to slide vacuum chambers with heating elements into magnets, no need to cut/weld flanges (very important in many aspects)
– Next steps: material/dimensions/fabrication methods/tolerances of vacuum chambers, deformation under vacuum as well as bakeout options need more studies to optimize for maximum beam aperture but also to build a (very) reliable system.