Director's Corner

ILC Pre-Lab preparation on the accelerator

| 26 February 2021

Superconducting RF cavities for ILC (Credit: Rey.Hori/KEK)

Superconducting RF cavity design for the ILC (Credit: Rey.Hori/KEK)

The International Development Team (IDT) was established in August 2020, and its Working Group 2 has been conducting preparatory accelerator work for the ILC Pre-Lab. Working Group 2 currently has about 40 members.

In the Pre-Lab, the following accelerator-related tasks are expected to be performed:

(1) Technical preparations.

(2) Final technical design and documentation.

(3) Preparation and planning of deliverables.

(4) Civil engineering and infrastructure.

We will need more people to help us prepare for the ILC construction to carry out the above-mentioned tasks, and training and educating such staffs are necessary. In WG2, we created four subgroups: electron and positron sources, ML/SRF for accelerating beams to high energy using superconducting radio-frequency (SRF) technology mainly at the main linac (ML), DR/BDS/Dump for damping ring (DR) and collision point area, and civil engineering and infrastructure.

Approximately 120 SRF cavities (corresponding to roughly 1 percent for the ILC) will be manufactured worldwide during the preparation period, and their performance will be evaluated. A total of six cryomodules will be made in Asia, the Americas, and Europe, and transported by sea to to Japan, and we will ensure that there is no performance degradation and that the modules are made according to global specifications. Two schemes for the positron source are currently under consideration: the undulator scheme and the electron-driven scheme. The target to create positrons and a magnetic focusing system to efficiently collect them will be considered for both schemes, and prototypes of certain components will be made. The positron generation scheme will be down-selected during the preparation period.

A total of 18 topics were proposed and summarised in the Technical Preparation Document. Each will be evaluated in an internal review organised by the IDT Executive Board. The preparatory period efforts are expected to be in-kind contributions that will be shared by each region and institute and will be implemented with their own budgets. The Technical Preparation Document is intended to be used as reference material for budget requests.

The final design will be based on the 2013 Technical Design Report and incorporate the results of further R&D, leading to the Engineering Design Report. The ILC construction cost will also be confirmed based on the Technical Design Report.

Preparation and planning for mass production will be discussed in each region based on the technical preparation activities .

The candidate sites’ underground civil engineering plan, based on the geology of the Kitakami area, and a summary of discussion for the strategic environmental assessment are available to the public. Additionally, a subsequent project phase assessment and geological survey of the construction route will be conducted during the preparation period.

The ILC is an international project. Researchers and engineers from around the world will be involved in ILC construction and its operation. It is important to develop human resources, who will play a major role in ILC construction as technical preparations and detailed designs are developed.

ILC collaborators will meet remotely in March during the 2021 International Workshop on Future Linear Colliders (LCWS2021). And together with the entire ILC family, our working group will help ensure a smooth transition to the ILC Pre-Lab.


Shinichiro Michizono

Shinichiro Michizono (KEK) leads the ILC accelerator design efforts as Chair of Working Group 2 of the ILC International Development Team.
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