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MUSE Report Summary

Project ID: 690835
Funded under: H2020-EU.1.3.3.

Periodic Reporting for period 1 - MUSE (Muon campus in US and Europe contribution)

Reporting period: 2016-01-01 to 2017-12-31

Summary of the context and overall objectives of the project

The Muon Campus at the Fermi National Laboratory (FNAL), USA, is hosting two world class experiments dedicated to the search for signals of new physics. Muon (g-2) will determine with a ten-fold improvement the anomalous magnetic moment of the muon while Mu2e will improve by four orders of magnitude the sensitivity on the search for the as-yet unobserved Charged Lepton Flavour Violating (CLFV) process of a neutrinoless conversion of a muon to an electron. European research institutions have a leading role in both detector development and construction and in the calibration and analysis of the data. The results from the FNAL experiments complement those from similar CLFV searches being carried out in Europe and produce very fruitful collaborations in this field. Through an involvement in both the US and the European programs, European institutes are at the forefront of the search for evidence of new physics in the muon sector.

The goal of the MUSE project is to establish new collaborations among European groups participating in the Muon Campus activities and to strengthen the already existing partnership with FNAL. MUSE coordinates the activities of about 70 researchers from four European research institutes and three small/medium-sized enterprises, promoting international and intersectoral collaboration by means of secondments of personnel, thus enhancing European contribution and visibility in this activity.

State-of-the-art detectors are being designed, built and commissioned. The Mu2e crystal calorimeter has to provide unprecedented timing performance for low energy electrons in the presence of a strong magnetic field, exploiting solid state photosensors, and the Mu2e high-purity germanium detector needs to record X-rays at rates and in radiation levels surpassing previous experiments. The Muon (g-2) straw-tracking system measures the muon beam profile with an accuracy in the vertical plane of better than 10 mrad and efficiently identifies pileup and lost-muon events. A laser monitor system is a common effort of the two experiments, with the need for Muon (g-2) to reach an accuracy at the sub-per mil level. The existing EU infrastructures for testing radiation hardness and characterizing the detector components make the European contribution significantly stronger.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

The Muon Campus is a unique world-leading facility providing the most intense pulsed-muon beams which will be exploited as one of the cleanest probes for new physics: both Muon (g-2) and Mu2e experiments will search for the evidence of new fundamental interactions beyond those predicted by the Standard Model. Fermilab is progressing on schedule on the construction of the infrastructures for the accelerator complex and for the experiments. The work connected to the detectors is progressing as planned. In Muon (g-2), MUSE researchers are involved in the straw-tracking system and in the laser calibration. Both detectors components were installed inside the experiment and commissioned with the first muon beam in June 2017. Calibration techniques have been outlined and are being refined. The first physics run is planned for the beginning of February 2018. Mu2e detectors of interest to MUSE are the crystal calorimeter and the Mu2e high-purity germanium Stopping Target Monitor. Both detectors are currently completing the prototyping stage and are moving to the production phase, in line with the scheduled plan.

In the framework of the project, it is important to underline the new-born collaboration among MUSE partners for the irradiation tests. Dedicated campaigns took place at the ELBE facility in HZDR since the start of the action. MUSE researchers from all EU research institute, together with US colleagues, tested the radiation hardness of calorimeter components and the functionality of the Stopping Target Monitor of the Mu2e experiment.

The European research groups participating in the Muon Campus experiments successfully profited from the mutual exchange of skills triggered by MUSE existence, sharing and consolidating different area of expertise in advanced technologies. Notable examples are the already mentioned common work on irradiation damage, the participation of Muon (g-2) laser experts in the design of the Mu2e laser system and the transfer of knowledge on latest generation silicon photosensors for the development of detectors able to monitor online high-intensity laser plasma experiments. Besides the activities among research institutes already discussed, transfer of knowledge takes advantage from the presence of industrial partners, thus enforcing inter-sectoral exchanges.

Networking among institutes, trainings of personnel, dissemination and outreach are important aspects of the project. A lot of effort has been dedicated to these activities. This has produced an intense transfer of knowledge among participants and a high visibility of the project both towards the scientific community and the general public.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

Technological challenges adopted to have state-of-the-art detectors, able to operate in the unique environment of the FNAL Muon Campus, find application in different fields. Remarkable examples are the development of electronics components able to survive in high radiation environments, which is an R&D common to space applications, and EMC (Electro-Magnetic Compatibility) compliant equipment that are used in medical instrumentation. Another field of interest for medical imaging is the development of large-area Silicon photosensors able to work in the deep-UV region, opening the possibility of adding timing information to the standard PET imaging.

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