Calibration of the aerogel tiles for the helix rich

P. Allison, J. J. Beatty, L. Beaufore, Y. Chen, S. Coutu, E. Ellingwood, M. Gebhard, N. Green, D. Hanna, B. Kunkler, I. Mognet, R. Mbarek, K. McBride, K. Michaels, D. Müller, J. Musser, S. Nutter, S. O'Brien, N. Park, T. RosinE. Schreyer, G. Tarlé, M. Tabata, A. Tomasch, G. Visser, S. P. Wakely, T. Werner, I. Wisher, M. Yu

Research output: Contribution to journalConference articlepeer-review


HELIX (High Energy Light Isotope eXperiment) is a balloon-borne experiment designed to measure the chemical and isotopic abundances of light cosmic ray nuclei, especially the 10Be/9Be ratio over the energy range from 0.2 GeV/n to beyond 3 GeV/n. This is a key measurement for constraining cosmic-ray propagation models. The detector is a mass spectrometer, which is built around a 1 Tesla superconducting magnet and a high-resolution tracking system to determine particle rigidity. Time-of-flight counters and a ring-imaging Cherenkov detector (RICH) are used to measure velocities. The proximity-focused RICH consists of a radiator made of aerogel tiles (refractive index approximately 1.15) and a detector plane of silicon photomultipliers. For discrimination of the 9Be and 10Be isotopes at high energy, the refractive index of the aerogel must be known to a precision of 0.07%. Given the manufacturing tolerances in the production process, the index must be mapped over the lateral extent of aerogel tiles on a fine grid. In this contribution, we describe and show initial results from procedures developed for this task. These include laser-deflection and electron-beam measurements.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2019
Event36th International Cosmic Ray Conference, ICRC 2019 - Madison, United States
Duration: Jul 24 2019Aug 1 2019

All Science Journal Classification (ASJC) codes

  • General


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