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| Linac1 | |
|---|---|
| Name | Linac1 |
| Location | CERN |
| Type | Linear accelerator |
| Inaugurated | 1959 |
| Decommissioned | 1992 |
| Energy | 50 MeV |
| Operator | CERN |
Linac1 was the first high-energy linear accelerator installed at CERN and served as a primary injector for early proton accelerators, contributing to foundational experiments in particle physics and accelerator technology. It connected operations spanning Proton Synchrotron commissioning, beam dynamics studies, and the development of later facilities such as Linac2 and PS Booster. Linac1's construction, operation, and legacy intersected with leading institutions and figures in mid-20th century accelerator science.
Linac1's conception arose during planning at CERN alongside projects like the Proton Synchrotron and the Synchro-Cyclotron to provide high‑intensity proton beams for experiments at institutions including École Polytechnique, University of Oxford, University of Cambridge, and Imperial College London. The machine was built during an era of collaboration among facilities such as Harwell, Saclay, and Brookhaven National Laboratory, with design influences from the work of Rolf Widerøe and technological exchange with Stanford Linear Accelerator Center. Commissioning in 1959 enabled participation in experiments associated with the Bubble Chamber program, the CERN PS research agenda, and early studies that later informed the Large Electron–Positron Collider planning. Over its operational life Linac1 interfaced with networks of institutions including Max Planck Society, ETH Zurich, and University of Milan for detector tests and beamtime allocations.
The linac employed a drift-tube linear accelerator structure originally inspired by concepts developed by Ernest Lawrence and Rolf Widerøe. Its accelerating cavities, RF power systems, and vacuum infrastructure reflected engineering collaboration among workshops at CERN, Philips, and firms like Thomson-CSF. The RF source used klystrons and modulators similar to components produced by THOMSON and tested at facilities including DESY and SLAC National Accelerator Laboratory. Beam transport and focusing used quadrupole magnets modelled after designs validated at Brookhaven and Argonne National Laboratory. Control systems incorporated early implementations of techniques later standardized at Institut Laue-Langevin and Fermilab.
Linac1 delivered protons at an extraction energy around 50 MeV into the Proton Synchrotron and later into the PS Booster. Typical beam currents and pulse structures were coordinated with experiments at CERN's ISR era facilities and detector groups from University of Geneva, University of Edinburgh, and University of Glasgow. Beam diagnostics and emittance measurements employed instrumentation developed in collaboration with teams from CERN experimental groups and external partners such as CERN’s BE/ABP groups, while timing and synchronization referenced standards used by European Space Agency laboratories and radiofrequency schemes aligned with practices at Imperial College London.
Throughout its service Linac1 underwent staged upgrades influenced by developments at CERN and partner laboratories. Modifications to RF power chains and vacuum systems paralleled innovations tested at DESY and SLAC National Accelerator Laboratory, while beam intensity and reliability improvements aligned with requirements from the PS Booster commissioning and experiments led by groups at University of Birmingham, University of Liverpool, and University College London. Collaborative projects with industry partners such as Philips and Thomson-CSF supported replacement of components and incremental modernization consistent with evolving standards at CERN accelerator divisions.
Linac1 served as an essential injector in the CERN accelerator chain, feeding the Proton Synchrotron and assisting the commissioning of the PS Booster and experiments destined for the Intersecting Storage Rings. Its operation enabled physics programs involving detector collaborations from institutions such as CERN, University of Manchester, University of Birmingham, ETH Zurich, and CEN Saclay. The machine informed the design choices for successor injectors like Linac2 and impacted planning for the Super Proton Synchrotron and later projects including the Large Hadron Collider injector chain.
Beams from Linac1 supported early bubble chamber exposures, hadron spectroscopy, and cross-section measurements conducted by collaborations involving University of Cambridge, Imperial College London, University of Oxford, CERN research groups, and international partners such as Institut de Physique Nucléaire de Lyon. Its operational data contributed to studies cited by teams at Max Planck Institute for Physics, LAL Orsay, and University of Rome La Sapienza, and provided test beams for detector R&D that benefited projects at DESY and SLAC National Accelerator Laboratory. Technical know-how from Linac1 fed into accelerator physics literature and influenced training of personnel who later worked at Fermilab, Brookhaven National Laboratory, and KEK.
Linac1 was decommissioned in the early 1990s as Linac2 and other injector upgrades superseded its capabilities; the transition mirrored broader modernization efforts across CERN facilities and international centers such as DESY and SLAC National Accelerator Laboratory. Its components, personnel expertise, and operational experience left a legacy evident in injector design at CERN, pedagogy at universities including ETH Zurich and Imperial College London, and archival materials preserved in institutional records at CERN and partner laboratories. The machine's contributions influenced subsequent accelerator projects including the PS Booster improvements and informed engineering practices adopted by Fermilab and Brookhaven National Laboratory.
Category:CERN accelerators