Off-line Commissioning of the St. Benedict Radiofrequency Quadrupole Cooler-Buncher

D. P. Burdette; R. Zite; M. Brodeur; A. A. Valverde; O. Bruce; R. Bualuan; A. Cannon; J. A. Clark; C. Davis; T. Florenzo; A. T. Gallant; J. Harkin; A. M. Houff; J. Li; B. Liu; J. Long; P. D. O'Malley; W. S. Porter; C. Quick; R. Ringle; F. Rivero; G. Savard; M. A. Yeck

doi:10.1016/j.nima.2025.171187

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arXiv · 2504.08021

Off-line Commissioning of the St. Benedict Radiofrequency Quadrupole Cooler-Buncher

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Abstract

The St. Benedict ion trapping system, which aims to measure the $\beta-\nu$ angular correlation parameter in superallowed-mixed mirror transitions, is under construction at the University of Notre Dame. These measurements will provide much-needed data to improve the accuracy of the $V_{ud}$ element of the CKM matrix. One of the major components of this system is the radio frequency quadrupole cooler-buncher, which is necessary to create low-emittance ion bunches for injection into the measurement Paul trap. The off-line commissioning of the cooler-buncher, using a potassium ion source, determined that the device could produce cooled ion bunches characterized by a 50-ns full-width-half-maximum time width. The commissioning results also determined the trapping efficiency to be 93(1)$\%$ and the trapping half-life to be 20.0(5) s.

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D. P. Burdette, R. Zite, M. Brodeur, A. A. Valverde, O. Bruce, R. Bualuan, A. Cannon, J. A. Clark, C. Davis, T. Florenzo, A. T. Gallant, J. Harkin, A. M. Houff, J. Li, B. Liu, J. Long, P. D. O'Malley, W. S. Porter, C. Quick, R. Ringle, F. Rivero, G. Savard, M. A. Yeck. 2025-04-10. Off-line Commissioning of the St. Benedict Radiofrequency Quadrupole Cooler-Buncher. https://doi.org/10.1016/j.nima.2025.171187

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