Strategy for SCRF in next decade

2007Develop SCRF Centre of Excellence at TRIUMF industrial (PAVAC) and scientific collaborators (ILC, TTC)

ILC, 1.3 GHz (20/80)

Construct γ,F electron linac. Guarantees, pre-eminence of TRIUMF-ISOL facility for further decade.

Project establishes β=1 competence and capacity.

SPL @ LHC, 350 MHz

2010, a time for better-informed decision making

(Equipment contributions)

2015: long-term outlook?

Collaboration & diversification: 4th Generation Light Source

100 mA, multi-GeV, high brilliance

Compact light source (1.3 GHz) with CLS

Focus of next two years shall be to master 1.3 GHz SCRF, and to concentrate on those areas that have greatest overlap with ILC:

Single-cell production, 9-cell cavity fabrication, R&D on single-crystal elliptical cavity, process control, etc.

To qualify PAVAC as a N. American supplier. (A major achievement)

Finalize specification of the fission driver during this time – building on accrued expertise.

Infrastructure: build vertical cryostat compatible with 140 MHz and 1.3 GHz cavities; co-opt the 2nd Linde TC50 cryo-system that will be available 2 years in advance of delivery of λ/4 hi-beta cavities; purchase test equipment, etc.

Manpower: additional resources will be required.

Combination of machining & e-beam welding (PAVAC) and design, processing (clean room, BCP, HPR), SCRF test equipment and trained expert personnel (TRIUMF) will position us uniquely as a lab with SCRF expertise covering the entire range 0 <β<1.

Nascent SCRF Centre of Excellence positions TRIUMF to:

Build fission driver in 4 yr time frame

Collaborate on spoke cavities for CERN-SOLDE

Collaborate on (β=1) cavities for CLS

TRIUMF/PAVAC to become the major Canadian centre for: ILC (β=1) cavity production and/or for 350 MHz (β<1) cavities for CERN SPL.

Fission driver is a high power & beamload, large emittance, long bunch, low HOM loss linac. ERL main linac is converse of that.

Nor is there a match to ERL/FEL users requirements:•Very high-current short bunches (ps) with very low emittance (nm)•High-energy electron linac (several GeV) for hard x-ray production.

Conclusion: There is not sufficient overlap of the ERL (& IR-FEL) technical specification with the fission driver to proceed with an ERL addition.

However: CLS interested in Compact Light Source based on “inverse” Compton scattering with requirements:

High-current low-emittance electron gunLow-energy electron linac: 25 – 250 MeV (i.e. several γ,F modules)Tera-watt pulsed laser, e.g., TI-Sapphire or CO2.

Could be subject of future collaboration with Canadian Light Source, which could second personnel to TRIUMF for weeks or months to participate in SCRF studies (pending MoU).

Fate of the ERL and IR-FEL addition

Future additions• Vertical cryostat with bath insert for single cavity and nine cell cavity

tests• 1.3GHz test area – clean room?

– Overhead crane, shielded rf test bunker – Possible area in ISAC-II vault

• 2K cryo system– Phase II 500W 4K system will be available from 2007-2009 for cold

tests– Require sub-atmospheric pumping system plus recovery/scrubbing

system• Outside clean room

• 1.3GHz rf test equipment– LLRF control board– Amplifier– Test equipment

• Signal generator, freq counter, Power meter, scope, spectrum analyzer– Ancillaries

• cables, connectors, mixers, attenuators, phase shifters• Grad students and post-docs from ILC collaboration

Future Possible Light Source - 3• ICS (“Inverse” Compton Scattering)

– Concept:• Use 180º backscatter of laser photons from relativistic electron beam• Use Tera-watt pulsed lasers matched to high-current low-emittance electron

bunch– Proof-of-Principle:

• Demonstrated at Duke, UCLA, BNL, Frascati, etc.• Under development or construction at MIT, U Tokyo, U Hawaii

– Requirements:• High-current low-emittance electron gun• Low-energy electron linac: 25 – 250 MeV• Tera-watt pulsed laser, e.g., TI-Sapphire or CO2

– Pros:• “low” cost – comparable to high-end x-ray beamlines• Competitive for some time-resolved experiments• Possible to tailor design to suit particular types of experiments

– Cons:• Least developed concept for x-ray production• Brightness determined by electron beam emittance, hence limited by low

beam energy