CERN Radiation to Electronics

CERN Radiation to Electronics
Name	CERN Radiation to Electronics
Caption	Radiation testing at CERN test facilities
Established	1954
Location	Meyrin, Geneva
Type	Particle physics infrastructure and electronics reliability program

CERN Radiation to Electronics

The CERN Radiation to Electronics program is an institutional effort at CERN to assess, quantify, and mitigate the impact of ionizing and non‑ionizing radiation on electronic devices and systems used in high‑energy physics facilities. It supports accelerator projects such as the Large Hadron Collider and experiments like ATLAS, CMS, ALICE and LHCb by providing radiation qualification, testing beams, and expertise for radiation‑tolerant design. The program interfaces with international bodies, industrial partners, and academic groups to maintain reliability in the presence of complex radiation fields.

Overview

The programme coordinates radiation effects studies across accelerator infrastructure including the Super Proton Synchrotron, Proton Synchrotron, and the Injector complex while collaborating with national laboratories such as DESY, SLAC, Fermilab, Brookhaven, TRIUMF, RAL, and GSI. It engages semiconductor manufacturers like Intel, TSMC, NVIDIA, AMD, Infineon Technologies, and STMicroelectronics and standards organizations including IEEE, JEDEC, and IEC. The programme contributes to upgrades such as the High-Luminosity Large Hadron Collider and detector projects like Muon g-2, NA62, and neutrino initiatives including DUNE and CNGS.

Radiation Sources and Types Affecting Electronics

Radiation environments encompass primary beams from facilities like the Large Electron–Positron Collider (historic), secondary particle fields from beam interactions with targets and collimators, and background radiation around detectors such as ALICE Inner Tracking System and ATLAS Inner Detector. Key radiation types include ionizing photons from synchrotron radiation and bremsstrahlung, hadrons (protons, neutrons, pions) produced in beam‑matter interactions, heavy ions from fragmentation, and charged particles from cosmic ray showers influenced by Earth's magnetic field. Radiation spectra are characterized by energy distributions relevant to displacement damage (non‑ionizing energy loss) and single‑event effects from high‑LET particles encountered near targets, collimators, and beam dumps like those at the CERN Neutrinos to Gran Sasso era infrastructure.

Effects on Electronic Components and Systems

Electronics can exhibit total ionizing dose degradation, displacement damage, and single‑event phenomena. Devices such as bipolar transistors, CMOS integrated circuits, power MOSFETs, gallium nitride devices, optoelectronics from firms like Hamamatsu and photodetectors including SiPM arrays used in LHCb RICH detectors show parametric shifts under cumulative dose. Field‑programmable gate arrays from vendors like Xilinx and Altera can experience single‑event upsets, single‑event latchup, and configuration corruption. Digital systems, readout electronics for experiments such as ATLAS Tile Calorimeter and CMS ECAL, and control systems for accelerators like SPS are vulnerable to transient errors and long‑term failure modes. Radiation also affects optical transceivers used in systems integrating components from Finisar and Broadcom.

Testing and Characterization Methods

Characterization uses dedicated irradiation facilities including the CERN CHARM and related beamlines, proton test beams, neutron spectra from spallation sources, and heavy‑ion facilities like GANIL, HIMAC, RIKEN, and NSRL. Methods include total ionizing dose tests with gamma sources, displacement damage equivalent fluence assessments using 1 MeV neutron equivalents referenced to ASTM and JEDEC approaches, and single‑event effect cross‑section measurements with mono‑energetic ion beams from cyclotrons and synchrotrons. Test procedures align with practices from ESA and NASA for space electronics, leveraging dosimetry from instruments like RadFETs and activation foil measurements. Data analysis involves Weibull fits, cross‑section scaling, and Monte Carlo simulations using toolkits such as GEANT4, FLUKA, and MCNPX.

Mitigation Techniques and Hardening Strategies

Mitigation uses design practices including error detection and correction, triple modular redundancy, watchdog timers, and radiation‑tolerant layout techniques applied to ASICs developed with foundries used by MOSIS and collaborations like Europractice. Hardening approaches include use of Silicon on Insulator processes, hardened libraries, enclosed layout transistors, and guard rings employed in CERN‑designed chips for FEAST and GigaBit Transceiver families. System‑level strategies involve shielding with materials studied at CERN Materials Research programs, redundancy across systems like trigger and data acquisition for ATLAS TDAQ, and thermal management to reduce annealing variations documented in accelerator operations such as LEP upgrades.

Monitoring, Qualification, and Standards

Operational monitoring combines real‑time dose measurement using beam loss monitors from vendors like Berthold Technologies and radiation sensors integrated into accelerator control rooms, together with periodic qualification per standards from IEC and IEEE. Qualification campaigns are organized in coordination with collaborations such as RD50 and RD53 which define metrics for silicon detector radiation hardness. Board‑level qualification follows procedures from industrial bodies like JEDEC while firmware and software qualification adopt practices from ISO frameworks used by control systems such as SCADA deployments in accelerator facilities.

Operational Experience and Case Studies

Operational lessons derive from incidents and upgrades at facilities including lessons learned after long shutdowns for the LHC upgrades, failure investigations for readout electronics in CMS during early runs, and mitigation successes in the ATLAS pixel detector refurbishment. Case studies include qualification of power converters for the LHC magnet circuits, radiation testing campaigns for the HL‑LHC upgrade optical links, and collaborative efforts with industry for radiation‑tolerant commercial parts used in cryogenics control for experiments like ALICE and CMS Muon System.

Category:CERN