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Workshop Objectives &
Highlights fromDaresbury Meeting
Erk Jensen, CERN
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights 2
Workshop Charge• Compact Cavity RF Test results and performance validation (MS1)
• Results of successful cavity prototype tests including relevant issues and their mitigation. Develop evaluation criteria for performance in view of the LHC!
• Cryomodule & RF system development for SM18, SPS tests & LHC (MS2)• Discuss conceptual designs maximizing the common platform with fruitful
exchange of design ideas. Assess complexity of the cryomodule from design, fabrication and integration aspects. Mitigation of issues such as compatibility, CERN standards, material choices etc.
• Preparation for the beam tests in the SPS and future road-map (MS3)• Assess the feasibility of the present construction schedule and adapt to the
evolving machine schedule. This demonstration and a coherent plan is crucial for the construction of (8+2) LHC modules.
09-Dec-2013
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
Highlights from Daresbury Meeting• We could observe good progress on all fronts, but identified
some critical items (Coupler feed-through for SPS CM)• In order to stay consistent with the needs and without
changing nominal kick (3.4 MV), we changed from 3 to 4 cavities /IP /beam /side; i.e. now total 32 cavities!
• The collaboration across the Atlantic works very well! Thanks to all!
• Our planning: Be ready with SPS CM by winter 2015/16! This is very challenging – but it should remain challenging! Maybe we were too optimistic; we will present a more realistic schedule …
09-Dec-2013 3
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights 4
Hot News: LHC schedule beyond LS109-Dec-2013
LHCb b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
Injectorso o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
t
LHCo o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
Injectorso o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
LHCb b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
Injectorsb b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o b b b b b b b b b b b b o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
2015 2016 2017 2018 2019Q4 Q1 Q2
2020 2021Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q3 Q4
2022 2023 2024 2025 2026 2027 2028
Q1 Q2 Q3 Q4 Q1 Q2Q3 Q4 Q1 Q2 Q3 Q4Q1 Q2 Q3
Q1 Q2 Q3 Q4Q1 Q2 Q3 Q4 Q1 Q2 Q1 Q2 Q3 Q4
2029 2030 2031 2032 2033 2034
Q3 Q4 Q1 Q2 Q3 Q4Q1 Q2 Q3 Q4 Q1 Q2Q3 Q4
Q2 Q3 Q4 Q1 Q2 Q32035
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q4Q2 Q3 Q4 Q1 Q2 Q3Q4 Q1 Q2 Q3 Q4 Q1
No Linac4 connection during Run2 - only EYETS*) (19 weeks) LS2 starting in 2018 (July) 18 months + 3months BC (Beam Commissioning)
LS3 LHC: starting in 2023 => 30 months + 3 BCinjectors: in 2024 => 13 months + 3 BC
Run 2 Run 3
Run 4
LS 2
LS 3
LS 4 LS 5Run 5
LHC schedule approved by CERN management and LHC experiments spokespersons and technical coordinatorsMonday 2nd December 2013
LHC schedule approved by CERN management and LHC experiments spokespersons and technical coordinatorsMonday 2nd December 2013
*) Extended Year End Technical Stop
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights 5
SPS CM: Common design approach09-Dec-2013
UK 4-Rod
US Double QW
Conclusion – A common design approach to accommodate all the 3 cavity designs has been successfully developed.
• External Envelope• Cryogenic Interface• Cryogenic Process• Alignment (external and Internal) • …….
Challenges – Couplers and Tuners and their locations for the three designs are different.
US RF Dipole
For illustration only Shrikant Pattalwar
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights09-Dec-2013
Phase modulation & crabbing
6
CC1 CC2IP
Ideal crabbingBunch phase error (late arrival)
Good news: No loss of luminosity,but some offset of luminous region!
But: Crab Cavities must be phase synchronized!
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
We clearly identified as highest priority:
Get ready for SPS test on time!• To get there, we will have to advance the
engineering on the SPS CM!• plan:
• Dec 9-11, 2013: LHC-CC13 – things to progress for that!• Feb 6th, 2014: CM Status update meeting • March 2014: Freeze design• April 2014: Advisory committee for endorsement, release• Then: start procurement, cut metal
09-Dec-2013 7
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
Situation with LARP• Thanks! We wouldn’t be where we are w/o LARP!• Budget reduction? – exact scope to be refined.• SBIR: dressed of (RFD, DQW)• LARP commitment: 1 CM (SPS) containing 2 cavities.• FNAL started with SPS-CM (for RFD)
• due to changes of priorities at FNAL, progress was less than I had hoped for.
• Shrikant will look into the tuner implementation.
• CERN offers help with engineering/design! We invite LARP labs to use it!
• CERN has an interest to keep all 3 designs to advance the project!
09-Dec-2013 8
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
Down-selection?• LARP internal review (June 2013) pushed for a “down -
selection” asap,• we think what they really need is to contain the cost.
09-Dec-2013 9
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
The advantage of diversity • Friendly competition – mutual push• Complementarity• Comparing methods – comparing results• Consolidation of tools• We learn from trying
09-Dec-2013 10
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
One of these 3?
No – the choices are:
• Can we afford to keep these 3 designs?• Can we afford to discontinue one?• Can we afford to keep only one?
What are the choices?
09-Dec-2013 11
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
What about our defined milestone?• We formulated: “Initial Compact Crab Cavity down-selection, leaving at least two CC options for technical design and prototyping”.
• This was not meant to eliminate valid contenders!• We have done this
down-selection:
09-Dec-2013 12
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
Can we make a choice in 2014?• Yes: The choice is “increase our chances for success!”, i.e.
• continue with the 3 different, complementary designs until we can decide which cavity (cavities) can go in the LHC.
• We will propose criteria for this latter selection and agree on them with all involved (+ advisory committee?)
• We will decide what will go in the LHC after we have done relevant tests.
09-Dec-2013 13
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
Tests
• Vertical tests• Tests of dressed cavity• Low power RF tests of cavity in CM• RF tests of fully equipped cavity (HOM damping, power coupler)
• Test with beam in SPS
09-Dec-2013 14
relevant
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights 15
More highlights from Daresbury Meeting
09-Dec-2013
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights
My Daresbury conclusions• We must concentrate on preparing for the SPS tests first!
• This requires the freeze of the CM design soon!• CERN wishes to keep the 3 cavity proposals alive and supports them while they are valid.
• We count on LARP for continued support – may have to refine the exact scope. (for SPS, no change!)
• The decision which cavity can go into the LHC will have to be based on results of relevant tests – criteria to be established.
• Thanks to all!
09-Dec-2013 16
LHC-CC13, CERN EJ: Objectives&Daresbury Highlights 17
Now let’s have a constructive LHC CC-13 !
09-Dec-2013