The main objective for WP 1 “LHC consolidation, upgrades and R&D for future hadron machines” was the integration of the European and Japanese efforts on the LHC high luminosity upgrade into a construction project for the upgrade hardware. This covered aspects of high-field magnet development and wide-band RF systems (also in view of J-PARC upgrades and FCC).
Work in WP 1 has in general progressed on all fronts, with numerous E-JADE-supported secondments in both directions; the maybe most important achievement being the large Japanese contributions to the operation, upgrade and other activities of the ATLAS experiment and the construction, test and re-assembly of the D1 short prototype beam separation dipole magnet for the High Luminosity LHC upgrade.
WP 2 covered work at the Accelerator Test Facility (ATF2) at KEK operating an electron damping ring with ultra-low transverse emittance. The main objective of this work package was to demonstrate solutions and methods for final focus systems for future linear colliders.
Work package 2 has made excellent progress, commanding by far the highest number of E-JADE secondments. Important achievements of WP 2 are the assessment of the role of higher-order aberrations for the beam size, better understanding of wakefield sources at the ATF2, a full proof-of-principle demonstration of an orbit feed-forward scheme based on ground motion sensors placed on top of quadrupoles, a full characterisation of the vertical beam halo distribution, including reliable theoretical modelling, as well as first time measurements of the momentum distribution with a newly developed combined YAG/OTR monitor, using a new experimental technique, first-time non-invasive beam size measurements with the newly developed ODR/OTR monitor and substantial improvements in the achieved stabilisation of the beam at the interaction point using the IP-BPM and FONT intra-train beam-feedback systems.
WP 3 “Linear collider targeted R&D” had as main objectives the development of the site-specific design for the International Linear Collider (ILC) in Japan and a project implementation plan involving European participation at an appropriate level. Concretely, a completed preparation phase with a site-specific design and the preparation of the construction were envisaged during the E-JADE project duration. However, WP 3 has suffered from the unforeseen delay of the ILC project.
WP3 achievements comprise a detailed study of the various integration issues that will be encountered at the proposed Kitakami site and a detailed assessment of the ILC baseline change from a 500 GeV to a 250 GeV machine. This together with restating the case of how important positron polarization is for the ILC physics case are a key outcome of WP3 – together with the above-mentioned European preparation plan (“EIPP”) that was submitted in June 2018.
There is also a long-standing collaboration between Europe and KEK on the development and testing of 12 GHz copper RF structures for use at a CLIC-based linear collider. During 2015-16, the two test stands at KEK and CERN had been used to characterise CLIC accelerating structures.
WPs 4 and 5 also successfully executed their programmes, with major achievements being the installation of CERN-KEK offices, the implementation and execution of the envisaged communication strategy including numerous actions at all beneficiaries and partner institutions, and the evaluation of the secondment success based on a tool implemented for the purpose.
