Paper VT-TuP7
ARIEL RIB Transport line Vacuum System

Tuesday, October 31, 2017, 6:30 pm, Room Central Hall

The vacuum system of the Radioactive Isotope Beam (RIB) transport line is part of the Advanced Rare IsotopE Laboratory (ARIEL) at TRIUMF. This beam line will accept three simultaneous RIBs and transmit two of them to low energy experimental facilities and one to further accelerators. The RIBs will consist of ions of exotic radioactive species with masses ranging from 6 to 238 amu and energies from 10 to 60 keV. RIBs will be extracted from two new ARIEL target stations and one of two existing ISAC target stations. In ISAC, and one of the ARIEL target stations, targets materials ranging from metals, oxides, carbides to actinide compounds are irradiate by 50kW, 500 MeV protons from TRIUMF’s main cyclotron. The second ARIEL target will make use of 100 kW, 35 to 50 MeV electron beam which is converted to high-energy gamma rays in a thin layer of gold. These gamma rays are used for photodisintegration of beryllium oxide or photo photofission of uranium carbide. The beam line will be built on two floors. The lower floor will contain Medium and High Resolution mass Spectrometers (MRS and HRS) having 1:5,000 and 1:20,000 resolution, respectively. The upper floor will contain charge breeding equipment to provide a typical mass to charge ratio of 7 to allow further acceleration of heavier isotopes. The design pressure is 3· 10^-8 Torr for singly charged beams and 1· 10^-8 Torr for highly charged ion beams based on beam loss calculations. The system will use turbo pumps and scroll pumps to achieve the vacuum. Individual components of beam line and beam steering equipment were tested to determine their conductance in molecular flow, and the model of the vacuum profile was created. A 14.5 m prototype section of beam line was built and used to validate the profile model. The beam line is divided into isolable sections, and each section will have a standard vacuum pumping station to facilitate controls and interlocks.