On Wednesday, 29 June 2022, the next important stage in the preparation of the project of the liquid-argon system of the Near Detector (ND-LAr DUNE) was completed, namely, the Preliminary Design Review (PDR) was successfully passed.

It took two years to approach this stage: in 2020, the detector concept had to be approved, and in 2021―2022, the system readiness tested within the ND-LAr consortium, and the cost of works agreed upon.

PDR is a basic stage of any experiment. At this point, the engineering design of the project is actually approved for the first time. In case of the ND-LAr, reviewers highly appreciated the quality of the design of all the systems, including of the light redout system, an area of JINR responsibility.


Dune1Screenshot of the report by N. Anfimov (Zoom) during the Preliminary Design Review

The next step, the final approvement, or the Final Design Review (FDR) of the entire ND-Lar detector, is planned in two years. Meanwhile, all systems in full size are to undergo complicated tests. At present, tests of scaled-down module versions are being prepared at the Fermi National Accelerator Laboratory (FNAL, the US). The research scientist of the DLNP Experimental Department of Particle Physics Alexandr Selyunin (we reported about his activities earlier), along with his colleagues from other institutions, prepared for operation the electronics made at JINR.

b_700_0_16777215_00_https___lh3.googleusercontent.com_CiArADDjr6JA0W6gaU7nBQ2XE8TJDsLeWXCYj5Kx99Z6xVvSu3UCSce_IAJo43hO9uFi4DK3PbG4436UAewdpLSiWG_amNL0SG4Yc3NbNL_OLzU8lBKU0gIzGS0WqNN0Mdsx4p_aqOcFeQGHi.jpegLivio Calivers (Bern) and Alexandr Selyunin (Dubna) at FNAL


b_700_0_16777215_00_https___lh6.googleusercontent.com_CgzVK9dcKlIY3ksVDcx8oG-DC2V6rFWcIdwYvnhndO-QOTmzDTqBQzyhkxdv9INiB43VkxaaZqTJ7YZpC7z5PdjMI_6ZR2wEYBaM2BjJn84l_wmFECR4L7C0Qq8JsEqOb9cx8v5YHGmhhyjWr.jpegAlexandr Selyunin preparing electronics at FNAL


General requirements for equipment with the FNAL beam are very strict. The use of literally everything, every bolt and every fuse, has to be justified, which is already done to a necessary extent considering our system in the CERN EDMS service. CAD models of detectors, Gerber files, lists of components, testing procedures, possible risks, cost estimation characteristics and purchasing records, detector modelling and test results were uploaded here.

The completion of the assembly of the four-module (2x2) system is planned at the University of Bern involving the JINR group whereupon the system will be transported to the FNAL and tested there. Thus, in 2023, the R&D stage will be finished. This stage was envisaged in the NOvA/DUNE project approved by JINR. Over the next seven years, JINR will be able to participate in the international mega science DUNE experiment fully prepared. 

Nikolay Anfimov

Responsible for the light readout system at the ND-LAr DUNE detector,
Head of the Sector of Research Methodology,
DLNP Experimental Department of Particle Physics