The '''Uni'''versalUniversal '''L'''inearLinear Accelerator (UNILAC)'''Ac'''celerator is a [[heavy ion]] [[linear particle accelerator|linac]] based at the Heavy[[GSI Ion ResearchHelmholtz Centre ([[Gesellschaftfor fürHeavy Schwerionenforschung|'''GSI'''Ion Research]]) near [[Darmstadt]], [[Germany]]. It can provide beams of accelerated [[ion]]s of elements from [[Hydrogenhydrogen]] to [[Uraniumuranium]] with energies up to 11.4 [[MeV]] / [[atomic mass unit|u]].
The main branch consists of two ion source terminals followed by a [[Radio Frequency Quadrupole (RFQ)]] and by an IntergidigitalInterdigital 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.
The UNILAC is used both to send beams of heavy ions to experiments and to load the [[SIS18]] Heavy-Ion Synchrotron (Schwer-Ionen-Synchrotron) with high-energy ions.
