1. Nick Walker (DESY) EU GDE Meeting Oxford 25.10.2005
European XFEL
Nick Walker (DESY)
EU GDE Meeting Oxford

2. EURO-XFEL

3. ILC Projected Time Line
2005
2006
2007
2008
2015…
2010
2012…
GDE process
Baseline Config. Document (BCD)
Ref. Design Report (RDR) + $€¥
TDR
construction
synergy
EU FP7 ??
commissioning
physics
EURO XFEL
preparation
construction
operation

4. 20 GeV SCRF linac Primary focus: consolidate basic TTF technology
successful tech. transfer to industry
cost reduction through industrialisation
need extensive effort to achieve high reliability !!!
High-Gradient programme continues to be a priority for TESLA Tech. Collaboration
Both as part of the ILC and XFEL projects

5. TESLA 9-Cell Cavity R&D Established after 10 years R&D
Leak check
Frequency Tuning
Damage Layer Removal
Furnace treatments
Final Frequency Tuning
Final Surface Preparation
Final Cleaning
Bake-out ° C
Low-Power Acceptance Test
Tank Welding
Assembly for High-Power Operation
High-Power Testing
Established after 10 years R&D
Emphasis on QA/QC
Reliable transfer to industry

6. Electropolishing @ DESY
Results from DESY & KEK Q0
Eacc MV/m
New cavity production (30 cavities) will be put through EP
Significant increase in statistics
Specification / fine tuning of EP parameters (→ XFEL)
→ Module 6 (35 MV/m cryomodule)
High gradient programme also part of XFEL R&D

7. Cavity R&D R&D within Europe funded by XFEL project
Fabrication from large grain or single-crystal Nb discs
May remove the need for electropolishing
( cost!)
JLAB (P. Kneisel)
DESY
DESY
R&D within Europe funded by XFEL project
Mentioned also single-crystal

8. Cavity Package Auxiliaries
INFN blade tuner
SACLAY tuner (type III)
TTF TYPE-III HP Coupler
industrialisation – cost – reliability

9. Fabrication of TTF-3 Couplers
number of couplers
machining & welding
ceramic TiN coating
copper plating
final
e-beam welding
10 prototypes
Desy
FNAL
Industry
12 first series
40 second series
62 TTF-3 couplers have been fabricated to date
52 in industry

10. (XFEL) Coupler Industrialisation
Ongoing study at Orsay, France
TTF-3 (baseline)
XFEL coupler
4 diagnostics removed
Motorized tuning

11. (XFEL) Coupler Industrialisation
Ongoing study at Orsay, France
XFEL coupler
Reduced part count
Design simplification
Tolerance studies
Assembly processes
Mounting sequences

12. LLRF

13. Lorentz Force Detuning Compensation

14. LLRF

15. Cryomodule (CM) Variants
Main European emphasis is on - industrialisation - reliability - cost optimisation
TTF CM already 3rd generation

16. The FNAL Modulator
3 modulators have been developed, built and delivered to TTF by FNAL since 1994
They are continuosly in operation under different operation conditions
7 modulators have now been constructed by European Industry
Baseline
ILC recommended baseline
FNAL Modulator at TTF

17. Baseline Klystrons Specification: 10MW MBK 1.5ms pulse 65% efficiency
Thales
CPI
Toshiba
Baseline
ILC recommended baseline

18. Summary XFEL preparation pushing SCRF R&D linac tech. R&D in Europe
Industrialisation
Cost reduction
Reliability
Much overlap with ILC
XFEL specs. and ILC baseline very similar
High-gradient programme remains part of XFEL programme