ILC Spain - contribution to the accelerator


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ILC Spain meeting - attended by group leaders of the Spanish network for future colliders and Steinar Stapnes, Nobuhiro Terunuma, Akira Yamamoto, Hitoshi Yamamoto

The first half of the meeting was devoted to a discussion of the European strategy for particle physics that was approved by the CERN council on June 19th. The strategy document is linked to the agenda and everyone is encouraged to form his/her own opinion. Alberto presented the main passages relevant to the ILC, his interpretation and that of the CERN director. The renewed priority of a Higgs factory as the next large-scale installation is good news for the ILC. Timely construction of the ILC in Japan is deemed compatible with the European strategy and Europe is expected to make a contribution if the project goes ahead. It remains unclear how this will affect the plan for an installation in Europe, with some insisting on the complementarity between ILC and FCCee, while others would take the existence of a Higgs factory outside Europe as a reason to go directly to FCChh. Clearly, if Japan and its international partners cannot reach an agreement soon, Europe (and China) will launch their own (circular) Higgs factory projects.

In the discussion that follows, Steinar reviews the steps taken at CERN towards a formal agreement between KEK and CERN. It is unclear at this point how the existing efforts on physics and detectors at CERN will be re-organized. An "ILC platform" - modelled on the CERN neutrino platform that acts as a European hub for DUNE and HyperK - would be desirable. Apart from the organizational advantages of a central platform, recognition of the ILC as a CERN project, will help to drive home that the ILC is embedded in the European strategy, which is an important argument in the light of funding in Spain and other countries. At this stage a "higgs factory platform" seems more likely.

The second half of the meeting is devoted to the three proposals for Spanish contributions to the ILC accelerator:

- Ibon presents an update of the plan of ESS/Bilbao for a contribution to the extraction lines and beam dump systems. There are clear overlaps with the work done for the ESS in Lund and ESS is in a good position to take on this project. The effort on the extraction guarantees a good coordination of the last elements of the beam line and the beam dump design and gives ESS a chance to develop several aspects of the accelerator. A meeting with the responsible groups (KEK, CERN beam dump group) is to be arranged in the near future.

- Francis briefly discusses ideas for a contribution by ALBA to the damping rings. The main innovative aspect is the use of permanent magnets, which can lead to a significant power saving (up to 10% of total power of the facility). An important aspect that requires further work is the impact of radiation on the magnetization. The Daresbury group has developed a solution for CLIC based on permanent magnets, and Steiner has shared some of the relevant sources after the meeting.

- Luis presents the CIEMAT/IFIC plan for a contribution to the LINAC. Apart from the baseline design in NbTi, an option with higher-temperature superconductor (MgB2) is being explored, that will enhance the robustness of the system against heat deposited by photo-emission electrons accelerated by upstream cavities. The groups have started to analyse the design challenges, potential industry partners and cost of the main components (combined magnet + power supply, BPM + electronics).

Akira uploaded additional slides to clarify several aspects of the design, including an alternative combined magnet design with a smaller maximum field and estimates for the heat load due to the dark current.

The accelerator R&D groups are putting together lists of companies to demonstrate the Spanish industrial capacity. Erik Fernandez has circulated a brief summary of the European strategy among members of Induciencia, with an invitation for companies interested in the ILC to contact Erik. With interested parties we will assess whether all industrial capacities find a good match in the plan prepared by the public institutes.

Given the good progress in the three proposals, we hope to present a first draft of a document that outlines the Spanish contribution to the ILC in the next meeting. The next meeting will be announced as soon as a draft can be circulated within the network.


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