TITAN's Digital RFQ Ion Beam Cooler and Buncher, Operation and Performance

Abstract

We present a description of the Radio Frequency Quadrupole (RFQ) ion trap built as part of the TITAN facility. It consists of a gas-filled, segmented, linear Paul trap and is the first stage of the TITAN setup with the purpose of cooling and bunching radioactive ion beams delivered from ISAC-TRIUMF. This is the first such device to be driven digitally, i.e., using a high voltage ($V_{pp}=400\mathrm{V}$), wide bandwidth ($0.2<f<1.2\mathrm{MHz}$) square-wave as compared to the typical sinusoidal wave form. Results from the commissioning of the device as well as systematic studies with stable and radioactive ions are presented including efficiency measurements with stable ${}^{133}$Cs and radioactive ${}^{124,126}$Cs. A novel and unique mode of operation of this device is also demonstrated where the cooled ion bunches are extracted in reverse mode, i.e., in the same direction as previously injected.

34 pages, 17 figures

References in corpus (3)

• First Penning-trap mass measurement in the millisecond half-life range: the exotic halo nucleus 11Li
• Verifying the accuracy of the TITAN Penning-trap mass spectrometer
• First experimental determination of the charge radius of ${}^{74}$Rb and its application in tests of the unitarity of the CKM matrix

Cited by in corpus (28)

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• Opportunities for Fundamental Physics Research with Radioactive Molecules
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• Precision mass measurements of neutron-rich scandium isotopes refine the evolution of $N=32$ and $N=34$ shell closures
• New determination of double-beta-decay properties in 48Ca: high-precision Q-value measurement and improved nuclear matrix element calculations
• Breakdown of the Isobaric Multiplet Mass Equation for the A = 20 and 21 Multiplets
• Extinction of the N=20 neutron-shell closure for 32Mg examined by direct mass measurements
• Precision mass measurements of ${}^{125-127}$Cd isotopes and isomers approaching the $N=82$ closed shell
• The TITAN in-trap decay spectroscopy facility at TRIUMF
• Mass Measurements of Neutron-Rich Gallium Isotopes Refine Production of Nuclei of the First r-Process Abundance Peak in Neutron Star Merger Calculations
• Summit of the N=40 Island of Inversion: precision mass measurements and ab initio calculations of neutron-rich chromium isotopes
• Mass measurements of neutron-rich Rb and Sr isotopes
• Mapping the $N=40$ Island of Inversion: Precision Mass Measurements of Neutron-rich Fe Isotopes
• Investigating nuclear structure near $N=32$ and $N=34$: Precision mass measurements of neutron-rich Ca, Ti and V isotopes
• Precision mass measurements of magnesium isotopes and implications on the validity of the Isobaric Mass Multiplet Equation
• High-precision $Q_{EC}$-value measurement of the superallowed ${\beta }^{+}$ emitter ${}^{22}$Mg and an evaluation of the $A=22$ isobaric triplet
• Improvements to TITAN's Mass Measurement and Decay Spectroscopy Capabilities
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• Refined topology of the N = 20 island of inversion with high precision mass measurements of ${}^{31-33}$Na and ${}^{31-35}$Mg
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• Sensitivity Increases for the TITAN Decay Spectroscopy Program
• Low-Background In-Trap Decay Spectroscopy with TITAN at TRIUMF
• A Novel Transparent Charged Particle Detector for the CPET Upgrade at TITAN
• Stacked-Ring Ion Guide for Cooling and Bunching Rare Isotopes