NC Linac

In the first stage of the REX-ISOLDE normal conducting linac the ions are accelerated from 5 keV/u to 300 keV/u by a 4-rod RFQ. In order to match the beam from the RFQ into the acceptance of the IH (Interdigital H-type) structure a section consisting of two magnetic quadrupole triplet lenses and a rebuncher is required. The beam is accelerated to 1.2 MeV/u in the IH structure.

The high-energy section (1.2 – 2.2 MeV/u) of the linac consists of three 7-gap resonators. These spiral resonators are designed and optimised for synchronous velocities of β = 5.4%, 6.0% and 6.6%. Each resonator has a single resonance structure, which consists of a copper half-shell and three arms attached to both sides of the shell. All linac structures are operated at 101.28 MHz.

In the spring of 2004 an additional 9-gap IH structure, operating at a frequency of 202.56 MHz was installed in the high-energy section of the linac. This provides ions accelerated to 3 MeV/u.

RF controls \\cern.ch\dfs\Departments\AB\Groups\RF\Machines\Linacs
2022 According to Cristiano we can only go to a pulse length of 1.0 ms (flat top), which is already decided. RF linac following the table below at 20Hz.

Desynchronize/synchronise REXEBIS with Linac
https://isoldeop.web.cern.ch/faqs/how-pass-linac-standalone-mode-1hz

9GAP and IHS tripped
https://isoldeop.web.cern.ch/faqs/9gap-and-ihs-tripped