| AVS 65th International Symposium & Exhibition | |
| Vacuum Technology Division | Wednesday Sessions |
| Session VT-WeM |
| Session: | Vacuum Technology Developments |
| Presenter: | Geoff Hodgson, TRIUMF, Canada |
| Authors: | G. Hodgson, TRIUMF, Canada B. Barquest, TRIUMF, Canada |
| Correspondent: | Click to Email |
The ARQB is an installation on the RIB (Radioactive Ion Beam) beamline in the new ARIEL (Advanced Radioactive IsotopE Laboratory) facility. The ARQB accepts continuous radioactive beam from future proton and electron-excited targets in the basement of ARIEL, and from existing targets in TRIUMF’s ISAC facility. The buncher creates 10 to 100 Hz bunches for injection into the EBIS (Electron Beam Ion Source) for charge breeding. The ARQB is held at roughly +60 kV to electrostatically deaccelerate the beam to 150 keV at the injection optics. Between the ARQB and the EBIS, is a pulsed drift tube that reduces the ground potential beam energy to roughly 15 keV.
The cooling and bunching takes place in the core of the buncher in 0.05 mbar and ~80K helium. Helium is supplied through a stepper-controlled variable leak valve. Cooling is provided by a cryocooler thermally bonded to a copper jacket around the quadrupole core. The quadrupole electrodes and support structures create a differential pumping barrier between the core and the body of the ARQB chamber, which is expected to be held at 7e-4 mbar with one turbo pump. The injection and extraction electrodes create a second layer of differential pumping volumes, where pressure is expected to be 5e-5 mbar.
The design is based on the BECOLA beam cooler and buncher at Michigan State University. Vacuum testing is expected to start May 2018, and first stable isotope beam injected in October 2018. First radioactive beam from ISAC is expected in early 2019, and first beam from the ARIEL target in 2021.