Illustration of the TITAN setup showing the three traps (RFQ, EBIT, and MPET) and the transfer beam lines. The ion optics from the switch yard to the EBIT can be switched from injection to extraction settings. A fast TOF gate enables to separate one ion species for the injection into MPET.
TOF spectra of ions extracted from the EBIT at 2 keV transport energy, 10 mA/2.5 keV electron beam current/energy, and t breed ≈30 ms. (a) Selection of a single ion species with the new fast ion gate. For the gray filled spectrum the BNG was permanently on ground potential and thus open, for the solid line spectrum it was biased and only switched to ground for 400 ns to let 85Rb9 + pass. (b) Comparison of charge breeding with 85Rb injection to the background of the EBIT due to ionization of residual gas. (c) Charge bred radioactive 76Rb and 75Rb delivered from ISAC.
Sketch of the trap structure (top) and the potential shape following from typical voltage settings (bottom). The two end caps can be switched between two voltages for capturing the injected SCIs and extracting HCIs. The potential on the central DT can be ramped up during the charge breeding process which preferentially pushes low mass ions (residual gas) out of the trap.
TOF spectra of ions extracted from the EBIT at 1.5 keV transport energy, 70 mA/2 keV electron beam current/energy, and t breed ≈195 ms; (a) comparison of the normal breeding scheme displaying the 84Kr charge state distribution achieved after 195 ms to the accumulation scheme, where the trap is not depleted and reset before the next SCI injection, (b) separation of the two isobars 71Ge and 71Ga by breeding to the neon-like charge state.
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