# Presentation: 160759

## SMTF status and Fermilab Perspectives

- Shekhar Mishra

- Goal: Develop U.S. Capabilities in high gradient and high Q superconducting accelerating structure in support of the International Linear Collider and other accelerator projects of interest to U.S.

- Fermilab is ready to provide the leadership in forming a U.S.
- collaboration to develop SCRF high gradient technology in coordination
- with the international community.

## Participating US Institutions

- Argonne National Laboratory (ANL)
- Brookhaven National Laboratory (BNL)
- Cornell University
- Fermilab
- Jefferson Laboratory (JLAB)
- Lawrence Berkeley National Laboratory (LBNL)
- Los Alamos National Laboratory (LANL)
- MIT-Bates Laboratory
- National Superconducting Cyclotron Laboratory (MSU)
- Oak Ridge National Laboratory/(SNS)
- Stanford Linear Accelerator Center (SLAC)

- TESLA Collaboration Meeting

## Future US Superconducting RF Projects

- International Linear Collider (ILC)
- The Rare Isotope Accelerator (RIA) (located at Argonne or MSU) would use a SCRF linac. RIA will also help drive the development of SCRF in US industry.
- Proton driver (8 GeV High Intensity Proton Superconducting Linac at Fermilab or BNL).
- Upgrades (12 GeV) of JLAB electron linac, the extensions of the FEL and the proposed ELIC (Electron Light Ion Collider)
- SNS (Spallation Neutron Source) upgrades to achieve higher beam power ~ 4 MW.
- Fourth generation light sources at ANL, BNL, Cornell, JLAB, LBNL, and MIT using SCRF linac technology for ERL_s_ (energy recovery linac) or FELs (free electron laser).
- Brookhaven plans to use ERLs for electrons colliding with RHIC heavy ion beams (E-RHIC) and for electron cooling of the RHIC beams.

- TESLA Collaboration Meeting

## Superconducting Module Test Facility

-  A consortium of US laboratories and universities are proposing to construct a Superconducting RF Module Test Facility (SMTF) under the Fermilab leadership.
-  The facility would fill in the gaps in the existing SCRF infrastructure present at the US laboratories.
-  It will facilitate state-of-the-art developments in high gradient and high Q SCRF cavities.
-  Fermilab is commencing a new initiative in Superconducting RF (SCRF) research and development as part of the program to participate in the International Linear Collider (ILC) and to build a Proton Driver.

- TESLA Collaboration Meeting

## Specific Goals for SMTF

- Demonstration of superconducting cavities with > 35 MV/m accelerating gradients operating at 1.3 GHz, in pulsed operation with a 1% duty factor and with high beam loading.
- Facilitate the formation of a U.S. SCRF accelerator collaboration that will eventually develop, along with our international partners, a design for the ILC main linac.
- Demonstration of high gradient, pulsed mode, <1 cavities at 325 MHz for Proton Driver and related applications.
- Demonstration of 20 MV/m CW operations for light source applications.
- Development of U.S. industrial capability for the fabrication of high performance SCRF cavities and associated infrastructures.

- TESLA Collaboration Meeting

## SMTF Facility Vision

- High gradient pulsed test area: Accelerate beam to ~ 1 GeV utilizing high performance accelerating cavities (> 35 MV/m, Q> 1e10).
- An electron beam source (ILC quality beam) and accompanying diagnostics
- Low beta pulsed test area: Perform high power rf testing of <1 accelerating structures in pulsed mode (~1% duty factor).
- CW test area: Perform high power rf testing of <1 accelerating structures in pulsed mode (~1% duty factor).
- All of these areas will includes rf, cryogenics, contols, and safety infrastructure to support the facility.

- TESLA Collaboration Meeting

## ILC Goals

- > 35 MV/m and Q>1e10

- Low Dark Current

- TESLA Collaboration Meeting

## Phases of SMTF

- Phase 1:
- Installation of infrastructure culminating in the rf power tests of a single ILC cryomodule within the high gradient pulsed test area.
- This cryomodule is anticipated to be provided by DESY.
- Relocation and recommissioning of the Fermilab NICADD Photoinjector in the SMTF.
- Phase 2a:
- Initate beam tests of a single ILC cryomodule utilizing the photoinjector.
- Commission the low beta and CW test areas.
- Phase 2b:
- A complete ILC rf unit, consisting of four high performance cryomodules, fabricated by the SMTF collaboration with industrial partners.
- Install, and operate this rf unit with beam
- Phase 3: At the end of Phase II a very significant facility will exist with opportunities for evolution in a variety of directions.
- We anticipate that future development of the facility beyond Phase 2b will be determined in consultation with the ILC Global Design Initiative
- The status of the Proton Driver or other projects of interest to U.S. laboratories and funding agencies.

- TESLA Collaboration Meeting

## SMTF: Three Phase Approach

- TESLA Collaboration Meeting

## TESLA – Compatible beta < 1 Linac Concept

- Extend the cost-effective TESLA RF fan-out to proton and ion (beta < 1) linacs
- Field demonstration of fast ferrite phase shifters for individual cavity control with shared Klystron
- Develop a standard set of beta<1 cavities at TESLA-compatible frequencies
- 1300 MHz beta<1 cavities in TESLA cryomodules
- 325 MHz spoke resonators operated in pulsed mode
***Possibility of forming TESLA-like collaboration to share design and prototype effort ?***

- TESLA Collaboration Meeting

## How to start

- Use DESY cryomodule to get started
- In parallel:
- Develop capabilities to build >35 MeV/m cavities in US industry (Start with Tesla design)
- Beta <1 cavities design
- Builds tuners, input & HOM couplers etc
- Establish definition and pipeline for processing
- Vertical & Horizontal Dewar tests
- String assembly at US laboratories
- Develop industrial partners
- Construct cryomodules
- Final Assembly of cavity and cryomodule
- Testing at SMTF

- TESLA Collaboration Meeting

## Meson Area at Fermilab

- Run transfer line to this point

- Cryogenics Upgrade Plan

-  Needs for phase 12b) is 60 Watts at 2K
-  80K liquid nitrogen, 4.5 K gaseous helium and 2.0K superfluid helium
-  The cryogenic plant at Meson is capable of providing up to 60 Watts of 2 deg K He.
-  In about 1 year the 60 Watt system can be operational.
-  Phase 3 requires nx100 Watts refrigerator: Long lead time (2 years)

- SMTF

- TESLA Collaboration Meeting

## FNAL Meson Area SMTF Layout Example

- TESLA Collaboration Meeting

## A0 Photoinjector

- Upgrade Plans

- Present FNPL

- TESLA Collaboration Meeting

## ILC Injector for SMTF

- Phase 1 Cryomodule

- Phase 2a

- SMTF

- TESLA Collaboration Meeting

## RF Power

- RF power with two different frequencies initially 1.3 GHz and 325 MHz and CW
- We plan to be able to accommodate one complete ILC RF unit (36 cavities) at the SMTF facility for ILC.
- Additional RF power will be needed for Horizontal test stand.
- Each RF unit is powered by one 10 MW klystron. 1.3 GHz klystrons would be purchased from one of the three vendors used by DESY
- Klystrons: 5 klystron types (5 MW Thales, 10MW MBK, 300 KW Phillips (all at 1.3 GHz), 80 KW 3.9 GHz CPI, 3.9 GHz 4 KW CW klystron CPI
- Fermilab designed modulator is adequate for test facility
- If we use 8-cavity cryomodule then need:
- 3 large modulators High Power (5-10 MW)
- 2 small 3.9 GHz modulators, Low Power (300-80KW)

- TESLA Collaboration Meeting

## SMTF Expression Of Interest (EOI)

- Participating institutions are writing a EOI for the SMTF.
- This EOI is a outline of a plan that this collaboration wants to undertake in USA.
- The SMTF collaboration is going to meet at JLab on Sept. 30th 2004 to discuss the EOI.
- The EOI will be submitted to the Fermilab Director in the first week of Oct. 04.
- We anticipate that after some consultation with the DOE, Fermilab will respond with guidance on the next steps by the end of  Oct. 04.

- TESLA Collaboration Meeting