Conceptual Layout and Integration in High Luminosity Insertions
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The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
Conceptual Layoutand Integration in High Luminosity
InsertionsV. Baglin (TE-VSC)
6th HL-LHC Technical CommitteeCERN – 10th June 2014
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Outline• Vacuum performances
• Layout generalities
• Key areas:• Experiments• TAS-Q1• IT• Q3-D1• LRBB• TAN-D2• D2, Q4, Q5, Q6• Crab cavities• Masks
• ConclusionsV. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
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Vacuum Performances• Layout must ensure vacuum performances
• Vacuum stability: beam current, ion desorption
• Low background to the experiments
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
H2_eq / m3 mbar
<LSS1 or 5> ~ 5 1012 10-10
<ATLAS> ~ 1011 10-11
<CMS> ~ 5 1012 10-10
A. Rossi, CERN LHC PR 783, 2004.
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Layout Generalities• Sectorisation at each cold to warm transition:
• Lowest unbaked length at RT required• Decoupling RT and cryogenic systems
• Instrumented sector valve assembly
• Cryogenic system with perforated beam screen
• Room temperature system with NEG coating• Fully bakeable 200/250 deg, 50 deg/h• A roughing system every ~ 20 m• Instrumentation• Ion pumps every 28 m (to be review for HL-LHC)• Dedicated pumping for uncoated chambers• ID 80, 212 are standard aperture (100, 130 )
• Integration studies must take into account mobile systems (bakeout, pumping groups) and installation/desinstallation of components.
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
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Experiments• Complex and dedicated vacuum chambers: Be, Al (ATLAS) and stainless steel (CMS).
• NEG coated
• Minimised thickness flanges with helicoflex gaskets
• Adapted/dedicated supporting system
• Dedicated remote tooling at TAS
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Q1R5IP5
CMS forward chamber
TAS
TAS remote toolingInside FIN (fin iron nose)
RF bridge repair 18-1-2012
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Experiments for HL-LHC• For HL-LHC:
• Be, Al material• NEG coated, no RF bridges• Issue with flange connection, robustness and radiation. • Impose “quick” flange concept• Review/redesign TAS remote tooling• Mechanical supporting system to be compatible with
detector maintenance (no personnel intervention must be required)
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
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TAS-Q1• 2 sectors valves to decouple the experiments
and allow pumping, Ne venting
• NEG coated
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
ITTAS BPM
To be redesigned for HL-LHC to allow remote tooling
No room for personal to work !(even to take a picture !)
VAX area
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IT• Perforated shielded beam screen
• a-C coated beam screen
• Active cooling (~ 40-60 K)
• Cold/warm transition
• Interconnects length to be compatible with vacuum stability
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Under study, definition
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Q3-D1• Longest unbaked length in LHC : ~ 1.3 m !
•Weak area
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
HL-LHC has the sector valve assembly at D1
DFBX-Q3
D1
HL-LHC layout
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LRBB• Do not exist in LHC.
• Already sectorised
• Must be bakeable
• Material and layout to be studied and designed
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Must be compatible with background to experiments
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TAN-D2• Short distance between TAN-D2 to accommodate all
components (7.43 m)
• Integration of all components (collimators, BPM, vacuum system) not properly done during LHC construction
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Redesign of collimator’s envelope taking into account mobile equipment : bake out + pumping groups
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TAN-D2 for HL-LHC
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
This version must allow 5th axis and remote tooling
• Current layout with added mask (TCA)
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D2,Q4, Q5,Q6 for HL-LHC
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
• Re-use sector valve assembly
• a-C coated beam screen (5 – 20 K ?)
• 1. 9 K cold mass
• R-use Q4LHC cold warm transition for Q5HL-LHC
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Crab cavities between D2-Q4
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Collimation must be in the same sector as the 2nd beam to use it as a cryotrap protecting the cavities
• Q4 and Q5 sectorised
• Collimation sectorised
•Module sectorised
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Crab cavities between D2-Q4
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Layout study and designImpact of electron cloud and synchrotron radiation on crab modules ?
• Vacuum valves inside insulation vacuum: not inserted into sector valve chain
• Interconnects: one sector valve + instrumentation + cavity roughing
• 2nd non accelerated beam at cryogenic temp (2.0 K) => need beam screen / shadowing
Examples of HL-LHC crab cavities
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Other Masks and Collimators
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
Re-use of standard equipments
• Room temperature
• Bakeable to 250 deg, 50 deg/h
• Room is available
TCLIM -6R2TCL -6L1
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Conclusions• Conceptual layout well advanced
• Objective to:• Have vacuum performances compatible with HL-
LHC (1.12 A per beam, 2.2 1011 ppb, 2748 b)• 2.24 A in the IP instead of 1.16 A for LHC !• Above vacuum stability design margin !
• Review/redesign and develop along the LSS the remote tooling• Re-use vacuum equipments from LHC
V. Baglin – 6th HL-LHC Technical Committee – CERN – 10/6/2014
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The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
Thank you for your attention
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The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.