Cosmic-ray isotope measurements with HELIX
July 06, 2021
Recent discoveries of new features in Galactic cosmic-ray fluxes emphasize the importance of understanding the propagation of cosmic rays. HELIX (High Energy Light Isotope eXperiment) is designed to improve the measurements of light cosmic-ray isotopes, including the propagation clock isotope 10Be and stable secondary isotope 9Be, which will be essential to study the propagation of the cosmic rays. The magnetic spectrometer of HELIX consists of a 1 Tesla superconducting magnet containing a high-resolution gas drift chamber as a tracking detector and two velocity measuring detectors: a time-of-flight detector and a ring-imaging Cherenkov detector. While the HELIX instrument can measure the fluxes of the light isotopes from protons (Z=1) up to neon (Z=10), it is optimized to study the Be flux from 0.2 GeV/n to beyond 3 GeV/n with a sufficient mass resolution to discriminate between 10Be and 9Be. In this talk, I will review the scientific goals and the design of the instrument and report its current status and project plans.
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