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

2. 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.

3. 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.

4. 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!

5. 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
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

6. 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
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:

7. 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:

8. 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 )
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

9. 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:

10. General impression of the X-band session yesterday
Our activity hasn’t met in as complete a group since the CLIC workshop in 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:

11. 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

12. 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.

13. 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