1. A field programmable gate array-based time-resolved scaler for collinear laser spectroscopy with bunched radioactive potassium beams
- Author
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Georg Bollen, Ryan Ringle, J. A. Rodriguez, Shen Zhao, D. Tarazona, M. Hughes, Stefan Schwarz, P. F. Mantica, K. Cooper, Chandana Sumithrarachchi, M. Davis, Kei Minamisono, David J. Morrissey, D. M. Rossi, R. Strum, K. Hammerton, B. R. Barquest, and C. A. Ryder
- Subjects
Physics ,Isotopes of potassium ,Beamline ,Stable isotope ratio ,law ,Cyclotron ,Photodetector ,Atomic physics ,Spectroscopy ,Instrumentation ,Hyperfine structure ,Beam (structure) ,law.invention - Abstract
A new data acquisition system including a Field Programmable Gate Array (FPGA) based time-resolved scaler was developed for laser-induced fluorescence and beam bunch coincidence measurements. The FPGA scaler was tested in a collinear laser-spectroscopy experiment on radioactive (37)K at the BEam COoler and LAser spectroscopy (BECOLA) facility at the National Superconducting Cyclotron Laboratory at Michigan State University. A 1.29 μs bunch width from the buncher and a bunch repetition rate of 2.5 Hz led to a background suppression factor of 3.1 × 10(5) in resonant photon detection measurements. The hyperfine structure of (37)K and its isotope shift relative to the stable (39)K were determined using 5 × 10(4) s(-1) (37)K ions injected into the BECOLA beam line. The obtained hyperfine coupling constants A((2)S(1/2)) = 120.3(1.4) MHz, A((2)P(1/2)) = 15.2(1.1) MHz, and A((2)P(3/2)) = 1.4(8) MHz, and the isotope shift δν(39, 37) = -264(3) MHz are consistent with the previously determined values, where available.
- Published
- 2014