workshop objectives & highlights from daresbury meeting erk jensen, cern

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


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


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!


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


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


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


The advantage of diversity • Friendly competition – mutual push• Complementarity• Comparing methods – comparing results• Consolidation of tools• We learn from trying

09-Dec-2013 10


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


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


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


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


More highlights from Daresbury Meeting

09-Dec-2013


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


Now let’s have a constructive LHC CC-13 !

09-Dec-2013

workshop objectives & highlights from daresbury meeting erk jensen, cern

Documents

lhc schedule

lhc modules

lhccc13 things

cern ej

lhc experiments spokespersons

cern management

cern standards

realistic schedule