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The SPectrometer for Ice Nuclei (SPIN) is a commercially available icenucleating particle (INP) counter manufactured by Droplet MeasurementTechnologies in Boulder, CO. The SPIN is a continuous flow diffusion chamberwith parallel plate geometry based on the Zurich Ice Nucleation Chamber andthe Portable Ice Nucleation Chamber. This study presents a standarddescription for using the SPIN instrument and also highlights methods toanalyze measurements in more advanced ways. It characterizes and describesthe behavior of the SPIN chamber, reports data from laboratory measurements,and quantifies uncertainties associated with the measurements. Experimentswith ammonium sulfate are used to investigate homogeneous freezing ofdeliquesced haze droplets and droplet breakthrough. Experiments withkaolinite, NX illite, and silver iodide are used to investigateheterogeneous ice nucleation. SPIN nucleation results are compared to thosefrom the literature. A machine learning approach for analyzing depolarization data from the SPIN opticalparticle counter is also presented (as an advanced use). Overall, we report that the SPIN is able to reproduceprevious INP counter measurements

The SPectrometer for Ice Nuclei (SPIN): an instrument to investigate ice nucleation