Introduction to Summary of the X-band resource estimation exercise W. Wuensch Collaboration meeting 34 November 2011

Very brief, personal, view of the current status of the technical program and a look to the next years PETS - Easily making specifications. We need to test more often and in more realistic conditions. Accelerating structures – Probably close enough to specifications to go forward on a baseline, which means adding all details, statistics and lifetime. Big question is what happens with beam loading. We are still learning a LOT about life at 100 MV/m and have many refinements, optimizations and alternatives to work through. rf components – Diverse zoo of components, healthy and growing. High-power test capability – Still struggling. KEK recovered from the earthquake and has a steady, even expanding, program planned. SLAC winding down for us. CERN very promising now but still not there. CTF3 restricted to specialized system tests not high rep rate component tests. Breakthrough with new ideas on using medium power sources? High-gradient studies – Major elements of multi-scale picture of breakdown can now be simulated. Starting to produce direct predictions of dependencies, scaling laws and surface preparation techniques. Uncovering the effect of surface current on gradient. Specialized experimental set-ups getting closer to rf conditions.

Plus a secondary objective Our primary objective over the next five years Validate with enough statistics, fully-featured, ‘project-ready’, cost and performance optimized X-band system components for the CLIC main linacs. Plus a secondary objective Nurture an ecosystem of X-band and high-gradient collaborators, applications and suppliers.

This has lead to defining the following five work packages to help coordinate the work and resources among many groups and laboratories   Name WP Holder X-band Technologies RF-DESIGN X-band Rf structure Design A.Grudjev, I. Syratchev Walter Wuensch RF-XPROD X-band Rf structure Production G.Riddone RF-XTESTING X-band Rf structure High Power Testing S.Doebert RF-XTESTFAC Creation and Operation of x-band High power Testing Facilities E.Jensen (placeholder) RF-R&D Basic High Gradient R&D S.Calatroni We think the following program will fulfill our objective and will require the indicated resources. This needs to brought in line with the reality of the resources we will actually get, perhaps re-prioritizing, refined and made more precise. HELP!

Updated – now includes crab cavity rf system WP: RF-DESIGN Workpackage leaders: A.Grudiev, I. Syratchev Purpose/Objectives/Goals Deliverables (incl. approx. resource estimate) Schedule   Task 1: Design of X-band high gradient accelerating structures Contribution and follow-up to parameter evolution of CLIC project; optimization of designs for higher gradient and low breakdown rate as well as for lower cost and higher RF-to-beam efficiency: BDR investigation, pulsed surface heating investigation, couplers, wakefield measurements, wakefield suppression, special rf test structures etc. Better designs, new designs for new construction scenario or energy staging 2012-2016 Task 2: Design of PETS Refinement of designs, optimized ON/OFF Task 3: Design of auxiliary components WFM, Rf networks, breakdown monitors Task 4: Test definition and analysis Contribution to definition of high power test program, contribution to data analysis, integration of test results Task 5: Design of X-band crab cavity RF system Design of crab cavity and the corresponding high power RF system Additional information or comments: could be link to more information Link to other WPs/activities: This WP is linked to WPs BPH-BASE, BPH-SIM, BPH-ML, CTF3-003, BTS-001, CTC-004 and RF-XXXs Key partners: already engaged or potential as known Estimated resources (needed): 2012 2013 2014 2015 2016 Total Material (kCHF) 200 250 300 1350 Personnel (FTE) 5 6 29 Resource comment: Updated – now includes crab cavity rf system

WP: Production- Workpackage leader: G.Riddone Purpose/Objectives/Goals Deliverables (incl. approx. resource estimate) Schedule   Task 1: Construction of baseline accelerating structures Test structures for statistical and long term high-power testing with all damping features and high power couplers (for SATS and Test modules in CLEX) è we have to make sure that we count all the structures. including those for the CLEX modules 3 generations of test structures, total quantity 48, total cost ~6 MCHF. 12 in 2013, 12 in 2014, 12 in 2015, 12 in 2016 Task 2: Supply of small series development prototypes and/or medium power test structures Test structures for full features (4), wakefield monitor equipped (4), optimized high-power design (8), different machine energy optima (4), optimized process (8), develop DDS (2) and choke (2), compressor (2) Typically 12 variants in series of 4 structures each, total quantity 40, total cost ~6 MCHF. 8 structures per year Task 3: Supply baseline PETS (note: most PETS fabrication accounted elsewhere, e.g. TBL) PETS for statistical and long term high-power testing 4 PETS, total cost 0.2 MCHF. 2 in 2013, 1 in 2014, 1 in 2015 Task 4: PETS for ON/OFF testing PETS for on/ off test 2 generations 0.1 MCHF Task 5: Alternative fabrication method Explore alternative fabrication methods Structure fabricated with alternative procedure 2012-2016 Task 6: Baseline to pre-series development Take the fully tested x band rf Systems and evolve their production techniques to an industrialized process 2015 onwards Additional information or comments: could be link to more information Link to other WPs/activities: This WP is integrated to WPs CTF3-002, CTF3-003 and CTF3-004 Key partners: already engaged (CEA-IRFU, HIP, Dubna-JINR, Greece, Spain) or potential (Greece, Pakistan) Estimated resources (needed): 2012 2013 2014 2015 2016 Total Material (kCHF) 3000 3100 3300 3400 15800 Personnel (FTE) 9 11 12 53 Resource comment:

WP: Test areas Workpackage leaders: Erk Jensen Purpose/Objectives/Goals Deliverables (incl. approx. resource estimate) Schedule   Task 1: High-power test stands Task 2: Medium power, high rep rate test stand Task 3: Test stand operation Task 4: Additional information or comments: could be link to more information Link to other WPs/activities: This WP is linked to WPs Key partners: already engaged or potential as known Estimated resources (needed): 2012 2013 2014 2015 2016 Total Material (kCHF) Personnel (FTE) Resource comment:

WP: Testing Workpackage leader: Steffen Doebert Purpose/Objectives/Goals Deliverables (incl. approx. resource estimate) Schedule   Task 1: High power testing of x-band structures at CERN Test x-band structures at 12 GHz at CERN, access structure performance as a function of processing and fabrication parameters completed structutre tests and data analysis (1 FTE per teststand ) 2012-2016 Task 2: High power testing of x-band structures elsewhere (KEK/SLAC) Follow up structures testing elsewhere, provide resources, coordinate colaboration agreements,give technical input for testing and data analysis completed structure tests and data analysis (1 FTE at SLAC, 1 FTE at KEK) Task 3: Maintain overall testing schedule inline with R&D goals and priorities transparent structure testing planning updated testing schedule (0.2 FTE) Task 4: Maintain and coordinate globla data analysis and document results overview of the results to document achievements and draw conclusions data analysis, publications, 'database', (0.3 FTE) Task 5: Feedback to structure design and test stands Optimise the structure design and test stands Additional information or comments: Link to other WPs/activities: This WP should have a close link to RF-testfac to coordiante the needs Key partners: KEK, SLAC, CEA Estimated resources (needed): 2012 2013 2014 2015 2016 Total Material (kCHF) 200 250 1200 Personnel (FTE) at CERN 3 5 7 9 33 Resource comment: FTE elsewhere 2 10

WP: High-gradient Workpackage leaders: S. Calatroni, W. Wuensch Purpose/Objectives/Goals Deliverables (incl. approx. resource estimate) Schedule   Task 1: dc spark test areas 1 kHz range repetition rate, large area testing, fully instrumented dc spark systems 2 systems for a total cost of 0.5 MCHF First system operational 2012, second system operational 2014 Task 2: Theoretical and experimental studies of high-gradient and high-power phenomena Basic understanding of high-gradient and high-power phenomena including breakdown, pulsed surface heating, high-power rf design dynamic vacuum and dark current. Data analysis of existing experiments, new experiments proposal, computations, reports Task 3: Application of high-gradient and high-frequency technology to other projects Create technology base for compact normal conducting accelerators. Reports on high-gradient X-band applications Additional information or comments: could be link to more information Link to other WPs/activities: This WP is linked to WPs RF-xprod, RF-xtesting Key partners: already engaged or potential as known: SLAC, KEK, Helsinki Univ., Upssala Univ., IAP Sumy (Ukraine), Wueppertal U. Estimated resources (needed): 2012 2013 2014 2015 2016 Total Material (kCHF) 200 1000 Personnel (FTE) 1 Resource comment:

General impression of the X-band session yesterday Our activity hasn’t met in as complete a group since the CLIC workshop in 2009. The session yesterday gave me the impression that the X-band activity is really going strong. It surprised even me. The usual suspects from a few years ago have to a large extent been replaced by new faces with corresponding new ideas, initiatives etc. The collaboration is spontaneously covering the whole activity. Plus we can see significant effort directed at our most critical issue - test capacity. The information we received yesterday even allows us to project:

As indicated in the working group Overview of intended x-band test stand development As indicated in the working group Trieste energy linearization cavity PSI energy linearization cavity S. Doebert

Activity broken down by collaborator and work package based on received sheets and/or presentations.   Design Production Test areas Testing High-gradient CEA, Saclay Helsinki/NorduCLIC IFIC, Valencia KEK Lancaster Manchester Oslo/NorduCLIC PSI Trieste Tsinghua Uppsala/NorduCLIC JINR 12 6 5 4 And we still have a pipeline (partial list): Argonne, EPFL, ESA, F4E, Fermilab, Groningen, Sandia, SLAC, Sumy, Tartu, TERA.

And the sum of the template data gives: 2012 2013 2014 2015 2016 Totals Material budget [kCHF at current rate] Design 23 30 136 Production 458 350 320 145 1418 Test areas 795 770 780 110 2565 Testing 200 250 230 1080 High-Gradient 53 55 25 211 1529 1396 1385 560 540 5410 Manpower at institute [FTEyears] 2.8 1.6 11.6 2.7 1.2 10.5 5.2 3 21.6 0.4 1 2 5.8 5.6 3.9 4.6 4.3 22.7 16.7 15 16.3 12.1 72.2 Manpower at CERN [FTEyears] 2.75 1.75 0.75 8.75 1.5 3.25 1.25 8 7.5 7.75 9.5 6.75 4.5 33