RD50

RD50
Name	RD50
Type	Research consortium
Founded	1998
Location	CERN, Geneva
Fields	Semiconductor radiation detectors, Materials science, High-energy physics

RD50

RD50 is an international research collaboration focused on the development of radiation-tolerant semiconductor detectors for high-energy physics experiments and related applications. The collaboration brings together physicists, engineers, materials scientists, and technologists from major laboratories and universities to address challenges posed by high-radiation environments in particle accelerators and space missions. Activities span sensor design, irradiation testing, device fabrication, simulation, and technology transfer to experiments at large facilities.

History

The collaboration formed in response to demands from experiments at CERN and planned upgrades at the Large Hadron Collider after early experience from LEP. Founding participants included groups from DESY, SLAC National Accelerator Laboratory, Fermilab, and several European universities. Over time the consortium expanded to include institutes involved in upgrades for the ATLAS and CMS experiments and detector R&D for the High-Luminosity Large Hadron Collider. RD50 has been shaped by interactions with projects such as the ALICE upgrade, the LHCb tracker developments, and national laboratory programs at Brookhaven National Laboratory and TRIUMF.

Mission and Objectives

The primary objective is to design and validate semiconductor detector technologies that maintain performance after extreme ionizing and non-ionizing doses anticipated in future runs of the Large Hadron Collider and proposed colliders like the Future Circular Collider. Goals include understanding radiation-induced defects in silicon and alternative materials, developing robust pixel and strip sensors, and enabling reliable operation in experiments such as ATLAS and CMS. RD50 also aims to transfer mature technologies to industry partners and experiments at facilities like ESS and space agencies such as ESA.

Research and Activities

Research programs cover defect spectroscopy, device simulation, sensor prototyping, and accelerated aging studies at irradiation facilities. Key activities take place at irradiation centers such as the Paul Scherrer Institute, Jožef Stefan Institute, and the Institute of Nuclear Physics Polish Academy of Sciences, with beam tests at facilities including CERN SPS, DESY II, and Frascati National Laboratories. RD50 works on materials like float-zone silicon, magnetic Czochralski silicon, silicon carbide, and gallium nitride, and on sensor concepts including 3D silicon sensors, Low-Gain Avalanche Detectors (LGADs), and monolithic active pixel sensors used in experiments such as Belle II. Simulation and modelling efforts use tools developed at CERN and in university groups at University of Oxford, University of Manchester, and Universität Hamburg.

Organizational Structure

RD50 operates through working groups and coordination committees drawing members from national laboratories, universities, and institutes such as CERN, DESY, Fermilab, Brookhaven National Laboratory, KEK, and CEA. Governance typically involves an elected spokesperson, technical coordinators, and task leaders representing topics like defect characterization, sensor development, and qualification testing. Regular plenary meetings and topical workshops are held alongside conferences such as IEEE Nuclear Science Symposium, Vertex Detector Workshop, and workshops at ICTP.

Collaborations and Partnerships

RD50 collaborates with major experiments and collaborations including ATLAS, CMS, ALICE, LHCb, and detector consortia for proposed projects like the International Linear Collider. Partnerships extend to industrial foundries and companies such as Infineon Technologies, STMicroelectronics, Micron Technology, and specialized vendors engaged via programs at CERN and national procurement offices. The collaboration engages with standards and test-beam infrastructure at institutions like SLAC National Accelerator Laboratory and coordinates with national funding agencies such as EPSRC and European Research Council-funded projects.

Impact and Contributions

RD50 has contributed to the qualification of sensor technologies adopted in upgrades for ATLAS and CMS tracker systems and to the maturation of LGADs used in timing detectors. Publications from RD50 groups have influenced defect engineering approaches in silicon and promoted alternatives like silicon carbide for harsh environments relevant to ITER diagnostics and space missions by ESA and NASA. The collaboration’s test campaigns at facilities including the Paul Scherrer Institute and CERN SPS provided data underlying radiation damage models used by detector collaborations and manufacturers.

Funding and Membership

Membership comprises university groups, national laboratories, and research institutes from Europe, North America, and Asia, including University of Liverpool, Imperial College London, University of California, Berkeley, Massachusetts Institute of Technology, Tata Institute of Fundamental Research, University of Tokyo, and National Taiwan University. Funding sources include grants from agencies such as European Commission programs, national research councils like STFC, DFG, ANR, and institutional support from host laboratories like CERN and DESY. Internal resources are supplemented by collaborative project funding tied to upgrades of experiments such as HL-LHC and to technology development contracts with industrial partners.

Category:Particle physics collaborations