LINAC 2
Generated by GPT-5-miniExpansion Funnel Raw 38 → Dedup 0 → NER 0 → Enqueued 0
| LINAC 2 | |
|---|---|
 | |
| Name | LINAC 2 |
| Type | linear accelerator |
| Location | CERN, Meyrin |
| Operational | 1978–2013 |
| Energy | 50 MeV |
| Particles | H− ions |
| Status | decommissioned |
LINAC 2 LINAC 2 was a proton linear accelerator located at CERN in Meyrin, serving as an injector for the Proton Synchrotron complex and Super Proton Synchrotron. It delivered beams of H− ions at nominal energies used for transfer to the Proton Synchrotron Booster and subsequently to Large Electron–Positron Collider and Large Hadron Collider injector chains. The facility interfaced with institutions such as the European Organization for Nuclear Research, and contributed to programs involving collaborations with DESY, Fermilab, and the Paul Scherrer Institute.
Design and Technical Specifications
LINAC 2 was designed as a three-stage radio-frequency accelerating structure including an ion source, low-energy beam transport, and drift tube linac sections. The ion source technology incorporated designs similar to those used at Brookhaven National Laboratory and Los Alamos National Laboratory, producing H− ions extracted at a few tens of kilo-electronvolts for injection into the radio-frequency quadrupole. The accelerating fields operated at frequencies aligned with standards developed at CERN and resonant techniques comparable to systems in the Stanford Linear Accelerator Center program. Vacuum systems and RF power chains paralleled engineering practices from Max Planck Institute for Nuclear Physics collaborations. Diagnostics and beam instrumentation referenced prototypes from Institut Laue–Langevin projects.
History and Development
The project originated within planning efforts at CERN during the 1970s when upgrades to the Proton Synchrotron injector chain were required to meet demands from experiments at the Intersecting Storage Rings and later the Super Proton Synchrotron. Design reviews involved input from the European Committee for Future Accelerators and workshops attended by engineers from CERN, DESY, and Istituto Nazionale di Fisica Nucleare. Commissioning milestones were reported alongside developments at contemporary facilities such as CERN Proton Synchrotron Booster expansions and influenced upgrade paths for the Large Electron–Positron Collider. LINAC 2 entered routine operation in 1978 and played a sustained role through accelerator programs related to NA48, UA1, and other experimental collaborations.
Operation and Performance
In operation, LINAC 2 routinely produced beam currents and pulse structures matched to transfer requirements for the Proton Synchrotron Booster and downstream machines like the Proton Synchrotron and Super Proton Synchrotron. Performance metrics such as transmitted current, emittance, and reliability were benchmarked against injector standards set by Fermilab and Brookhaven National Laboratory. Operational teams included personnel seconded from CERN departments and visiting engineers from European Organization for Nuclear Research partner institutes. Maintenance cycles coordinated with schedules for experiments at CERN facilities including ALICE and LHCb when injector availability impacted run planning.
Upgrades and Modifications
Over its operational lifetime, LINAC 2 underwent incremental upgrades in RF systems, ion source technology, and control electronics analogous to modernization programs at DESY and KEK. Modifications addressed beam intensity and reliability to satisfy evolving needs of the Large Hadron Collider injector chain and influenced the design of its successor projects such as LINAC4. Upgrade activities involved collaborations with engineering groups from Istituto Nazionale di Fisica Nucleare, CERN accelerator divisions, and technical support from industrial partners in Switzerland and France. Retrofitting of diagnostics and power supplies reflected technological advances driven by research at Max Planck Institute for Physics and reported outcomes in workshops held by the European Committee for Future Accelerators.
Applications and Experiments
LINAC 2 supplied beams for a wide range of accelerator-based experiments at CERN, enabling research programs in particle physics that supported experiments like NA48, UA2, and pre-injector phases for LHC experiments including ATLAS and CMS. Its role as an injector affected beam time allocation for test beams used by detector development groups from European Organization for Nuclear Research member states and partner laboratories such as Paul Scherrer Institute and DESY. The facility also provided training opportunities for engineers and physicists associated with universities including University of Geneva and ETH Zurich.
Safety and Radiation Protection
Radiation protection at LINAC 2 followed regulatory frameworks established by Swiss Federal Nuclear Safety Inspectorate and International Atomic Energy Agency guidelines applicable to accelerator facilities. Shielding, interlock systems, and controlled access procedures were implemented in coordination with CERN safety units and occupational health services, aligning with practices used at Fermilab and Brookhaven National Laboratory. Decommissioning preparations referenced standards used by European Organization for Nuclear Research for radiological surveys and waste management, collaborating with national agencies in France and Switzerland for compliance.