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The '''Universal Linear Accelerator (UNILAC)''' is a [[heavy ion]] [[linear particle accelerator|linac]] based at the [[GSI Helmholtz Centre for Heavy Ion Research]] near [[Darmstadt]], [[Germany]]. It can provide beams of accelerated [[ion]]s of elements from [[hydrogen]] to [[uranium]] with energies up to 11.4 [[MeV]] / [[atomic mass unit|u]].<ref>{{cite journal|last=Barth|first=W.|coauthors=Bayer, W.; Dahl, L.; Groening, L.; Richter, S.; Yaramyshev, S.|title=Upgrade program of the high current heavy ion UNILAC as an injector for FAIR|journal=Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|date=NaN undefined NaN|volume=577|issue=1-2|pages=211–214|doi=10.1016/j.nima.2007.02.054|bibcode = 2007NIMPA.577..211B }}</ref>
The main branch consists of two ion source terminals followed by a [[Radio Frequency Quadrupole]] and by an Interdigital linac [[IH linac accelerator]] resonating at 36 MHz up to the energy of 1.4 MeV/u. The main part then is operated by a classical [[linac]] of the Alvarez type which resonates at 108 MHz. Final energy adjustmnet can be performed in the last section consisting of a series of single-gap resonators. This solution was proposed for maximum flexibility in beam energy.
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