# Presentation: 503680

## European Activities in Accelerator R&D for the ILC

- Nick Walker (DESY)
- LCFOA workshop21.9.2005

## Foreword

- This talk is primarily about ILC activities in Europe. However...
- it is no longer possible to look at a single region in isolation, and so we must now look at European activities within the global ILC context
- For each (European) topic covered in this talk, there is a similar R&D effort in the other two regions
- and the groups are working together

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## ILC Subsystems

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## ILC Subsystems

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## European ILC R&D

- SCRF linac technology
- >12 years R&D to produce a mature technology
- (reduce $/MeV by factor 20)

- ~20 GeV linac based on TESLA technology

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## TESLA Test Facility (TTF)

- Focus of the TESLA Collaboration (~12 years)
- Represents ~140 M€ investment
- Currently unique facility in the world
- TTF linac (VUV-Free Electron Laser) a test-bed for both European XFEL and ILC

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Main Linac: The Cost Driver

- Biggest single cost item
- Over 10 years of R&D by the TESLA Collaboration has produced a mature technology
- But we’re not quite there yet...

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Main Linac: The Cost Driver

- Primary focus of future R&D
- successful tech. transfer to industry
- cost reduction through industrialisation
- need extensive effort to achieve high reliability !!!
- XFEL project is already driving much of this development within Europe
- but ILC needs 35MV/m
- High-Gradient programme continues to be a priority for TESLA Tech. Collaboration
- Both as part of the ILC and XFEL projects

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## TESLA 9-Cell Cavity R&D

- Leak check
- Frequency Tuning
- Damage Layer Removal
- Furnace treatments
- Final Frequency Tuning
- Final Surface Preparation
- Final Cleaning
- Bake-out 120-130° 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

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Cavity R&D

- Leak check
- Frequency Tuning
- Damage Layer Removal
- Furnace treatments
- Final Frequency Tuning
- Final Surface Preparation
- Final Cleaning
- Bake-out 120-130° C
- Low-Power Acceptance Test
- Tank Welding
- Assembly for High-Power Operation
- High-Power Testing

- Electropolishing (120-150 m)
- 800 °C furnace treatment
- Electropolishing (20-50 m)
- High-pressure rinsing

- _Critical Steps_

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Electropolishing @ DESY

***Q*****0**

***E*****acc**** MV/m**

- Results from DESY & KEK

- 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 programmealso part of XFEL R&D

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Cavity R&D

- Fabrication from large grain or single-crystal Nb discs
- May remove the need for electropolishing
- ( cost!)

- R&D within Europe funded by XFEL project

- JLAB (P. Kneisel)

- DESY

- DESY

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

**Notes:**
Mentioned also single-crystal

## Cavity Package Auxiliaries

- TTF TYPE-IIIHP Coupler

- INFN blade tuner

- industrialisation – cost – reliability

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Fabrication of TTF-3 Couplers

| number of couplers | machining & welding | ceramic TiN coating | copper plating | final
e-beam welding |
| --- | --- | --- | --- | --- |
| 10 prototypes | Desy | FNAL | Industry | Industry |
| 12 first series | Industry | Desy | Industry | Industry |
| 40 second series | Industry | Desy | Industry | Industry |

- 62 TTF-3 couplers have been fabricated to date
- _52 in industry_

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## (XFEL) Coupler Industrialisation

- TTF-3 (baseline)

- 4 diagnostics removed
- Motorized tuning

- XFEL coupler

- Ongoing study at Orsay, France

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## (XFEL) Coupler Industrialisation

- Reduced part count
- Design simplification
- Tolerance studies
- Assembly processes
- Mounting sequences

- XFEL coupler

- Ongoing study at Orsay, France

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Cavity Tuner Mechanisms

- CEA modified TTF tuner
- (available Fall 2005)

- INFN blade tuner

- Both based on experience with existing tuner in TTF
- Both currently being prototyped

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## LLRF

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Lorentz Force Detuning Compensation

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## LLRF

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Cryomodule (CM) Variants

- TTF CM already 3rd generation

- Main European emphasis is on- industrialisation - reliability- cost optimisation

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## SC linac quadrupole R&D

- Large bore (Ø90mm) 60T/m
- Initial quench tests showed limitations
- Modifications currently underway
- Euro XFEL will use TTF-like superferric quads
- May also prove OK for ILC specifications

- CIEMAT (Spain) Cos(2) s.c. quadrupole
- TESLA TDR prototype
- ~70cm long

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## The FNAL Modulator

- FNAL Modulator at TTF

- 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

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Baseline Klystrons

- Thales

- CPI

- Toshiba

- Specification:
- 10MW MBK
- 1.5ms pulse
- 65% efficiency

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Other ILC R&D in Europe

- TESLA technology is Europe’s focus
- TTF
- European XFEL
- CARE programme (funded by EU FP7 programme)
- Europe also supports significant R&D activities in more general ILC R&D
- Sources (polarised e+)
- Damping Rings
- Beam Delivery & IR
- General beam dynamics
- Controls (GAN), Machine Protection, Reliability studies
- Detector R&D (long standing)
- ...

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## The Structure of EUROTeV

- ILC GDI
- Concept

- Beam Delivery System

- Damping Rings

- Diagnostics

- Metrology & Stabilisation

- Global Accelerator Network

- IntegratedLuminosity PerformanceStudies

- Polarised Positron Source

- EUROTeV forms the core of the European ILC activities *beyond* SCRF

- Represents significant resources available to GDE effort

- Total budget29 M€ over 3 yrs
- (EU: 9 M€)

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## The Structure of EUROTeV

- ILC GDI
- Concept

- Beam Delivery System

- Damping Rings

- Diagnostics

- Metrology & Stabilisation

- Global Accelerator Network

- IntegratedLuminosity PerformanceStudies

- Polarised Positron Source

- Total budget29 M€ over 3 yrs
- (EU: 9 M€)

- Major contributor

- National
- initiatives
- eg:

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## Approximate European ILC* 2005/2006 Spending

- * or ILC related

| Area of spend | FTEs | Other funds (k€) | Total (k€) |
| --- | --- | --- | --- |
| Injector | 24.4 | 238 | 1702 |
| SCRF Linac Tech | 107.0 | 9926 | 16346 |
| BDS | 40.7 | 332 | 2774 |
| Diagnostics | 32.9 | 864 | 2838 |
| Beam Dynamics | 21.9 | 77 | 1391 |
| Infrastructure | 54.1 | 528 | 3774 |
| Totals | 281.0 | 11965 | 28825 |

- Assuming an average of 60k€/FTE/Yr

- Currently under review

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## ILC Projected Time Line

- Nick Walker - LCFOA @ FNAL

- 21.09.2005

## ILC Projected Time Line

- synergy

- EU FP7 ??

- Nick Walker - LCFOA @ FNAL

- 21.09.2005