TIARA : Test Infrastructure and Accelerator Research Area

Test Infrastructure and Accelerator Research Area
Preparatory Phase

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WP7: ICTF R&D Infrastructure



ICTF : Ionisation Cooling Test Facility

The principal objective of this work package is to deliver detailed design reports of the RF power infrastructure upgrades that the Ionisation Cooling Test Facility at the Rutherford Appleton Laboratory requires for it to become the world's laboratory for ionization cooling R&D. See more information below.

WP7 Deliverables

Nb Name  Description Type Lead beneficiary Planned month Achieved month
D7.1 RFSySV-Spec Report on the design and specification of ICTF RF power distribution system for MICE Step V Report STFC 15 16
D7.2 RFAmp1-Test Report on commissioning of the first RF amplifier system in the ICTF Hall Report STFC 33 36
D7.3 RFSysVI-Spec Report on the design and specification of ICTF RF power distribution system for MICE Step VI Report STFC 36 16
D7.4 RF_Ampl-DR Design report of a 3 MW power amplifier Report CERN 36 36


WP7 Milestones

Nb Name Description Type Lead beneficiary Planned month Achieved month
MS27 RFSysReq Report on RF system layout and requirements Report STFC 8 10
MS28 SymDiac Simulation of Diacrode complete Report CERN 19 25



Further information on WP7 objective


Muon storage rings have been proposed for use as sources of intense high-energy neutrino beams at the Neutrino Factory and as the basis for multi-TeV lepton-antilepton collisions at the Muon Collider. To optimize the performance of such facilities requires the phase-space compression (cooling) of the muon beam prior to acceleration and storage. The short muon-lifetime makes it impossible to employ traditional techniques to cool the beam while maintaining the muon-beam intensity.  Ionization cooling, a process in which the muon beam is passed through a series of liquid-hydrogen absorbers followed by accelerating RF-cavities, is the technique proposed to cool the muon beam. A globally unique Ionisation Cooling Test Facility (ICTF) is under construction at the Rutherford Appleton Laboratory to provide the infrastructure required to allow the first steps in an ionization-cooling R&D programme to be carried out.


The ICTF presently serves the international Muon Ionisation Cooling Experiment (MICE) collaboration by providing a muon beam and the necessary infrastructure to carry out the first steps of the MICE programme. MICE is a collaboration of roughly 150 physicists and engineers from Europe, Japan, and the USA. The international MICE collaboration will provide the equipment that makes up the MICE cooling channel and the muon spectrometer systems. The value of these contributions has been estimated to be ~€40M. The goal of the MICE collaboration is to construct a single lattice cell of the Neutrino Factory cooling channel and to measure its performance in a variety of beam conditions and lattice configurations. The collaboration seeks to carry out the experiment in time for the results to inform the decision point (roughly 2012) on the future direction of the neutrino programme in Europe as identified by the Strategy Session of CERN Council. The importance of the MICE experiment and the ICTF to the European accelerator R&D programme is widely recognized and resources to allow Transnational Access to the facility have been approved by the Commission through the EuCARD Integrating Activity.



It is planned that the MICE experiment will be built up in six 'Steps'. Step I, which is being carried out at the moment, will perform a detailed characterization of the ICTF muon beam to establish that it can deliver the range of emittance and momentum required by the experiment. It is anticipated that Step I will be complete by the end of summer 2010. The muon spectrometer system will be implemented in Step II (first quarter 2010) and Step III (third quarter 2010) and the first liquid-hydrogen absorber and focus-coil (AFC) system will be implemented in Step IV (2011). Step V will add a first section of linac and a second AFC module and is expected to be complete in the second quarter of 2012/13. The upgrades to the ICTF that will be carried out within TIARA-PP will therefore enable Step V of MICE to be implemented and the first demonstration of ionization cooling to be made. The final configuration of the experiment will be reached at Step VI (2013) with the inclusion of the second section of linac and the third AFC module.  logo-eucard.png

The design of the infrastructure that is required for the ICTF to serve MICE up to Step IV is in hand, supported by the STFC. The work within TIARA-PP described below is required to allow the detailed design and specification of the RF power distribution system by which the ICTF can support Step V of MICE. In addition, by carrying out the design work required to further upgrade the RF power infrastructure, the ICTF will be able to support Step VI of MICE as part of the TIARA distributed network of European infrastructures for accelerator R&D.


A future Muon Collider would require an even more aggressive ionization cooling system that would reduce the size of the beam in all six phase-space dimensions. Various schemes have been proposed to achieve this. The US Muon Collider Task Force (MCTF) and Neutrino Factory and Muon Collider Collaboration (NFMCC) have taken the lead in the development of conceptual and engineering designs for 6D cooling lattices. The NFMCC and the MCTF are now collaborating under the umbrella of the US Muon Accelerator Programme (MAP). One particular proposal, MANX, which is based on a helical transport channel filled with high-pressure hydrogen gas, has already been proposed as a possible user of the ICTF once the MICE experiment has been completed. The MANX collaboration has initiated discussion of the implementation of the experiment at the ICTF using the MICE spectrometer systems with the MICE collaboration and resources have been made available in the US for design work on the 6D cooling experiment to continue.




While no decision has yet been reached on use of the ICTF by MANX, their interest demonstrates the broad applicability and generic value of the Ionisation Cooling Test Facility at the Rutherford Appleton Laboratory as an accelerator R&D infrastructure to be included in TIARA. It is the only facility in the world capable of providing the necessary infrastructure to develop the technologies required for muon cooling for the Neutrino Factory and Muon Collider communities. MICE is expected to be completed by 2014 after which the six-dimensional (6D) ionization cooling R&D programme will be initiated. It is likely that the 6D cooling programme will take 10 years to complete. Therefore it is crucial that the ICTF infrastructure be sustainable until at least 2024. It is therefore essential that preparations are made to replace the triode-based amplifiers in a future upgrade. For this reason, it is proposed to carry out a design study of a novel Diacrode-based high-power amplifier that will form the basis of a future upgrade to the ICTF RF power system.


The work that will be carried out in this work package will allow the ICTF to realize its full potential as the world's ionization-cooling R&D infrastructure. The upgraded ICTF will become part of the internationally-open TIARA network of infrastructures for accelerator R&D in Europe, allowing Europe to contribute a unique facility to the international accelerator R&D effort and ensuring continued European leadership in this area.



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