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The ISOMAX Magnetic Rigidity Spectrometer

Hams, T. and Barbier, L. M. and Bremerich, M. and Christian, E. R. and Davis, A. J. and deNolfo, G. A. and Geier, S. and Goebel, H. and Gupta, S. K. and Hof, M. and Krizmanic, J. F. and Menn, W. and Mewaldt, R. A. and Ormes, J. F. and Schindler, S. M. and Simon, M. and Streitmatter, R. E. (1999) The ISOMAX Magnetic Rigidity Spectrometer. In: Proceedings of the 26th International Cosmic Ray Conference. Vol.3. International Union of Pure and Applied Physics , pp. 121-124.

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The Isotope Magnet Experiment, (ISOMAX), is a balloon-borne superconducting magnetic spectrometer with a time-of-flight system and aerogel Cherenkov counters. Its purpose is to measure the isotopic composition of the light elements (3 < Z < 8) in the cosmic radiation. Particle mass is derived from a velocity vs. magnetic rigidity (momentum/charge) technique. The experiment had its first flight in August 1998. The precision magnetic spectrometer uses advanced drift-chamber tracking and a large, high-field, superconducting magnet. The drift-chamber system consists of three chambers with 24 layers of hexagonal drift cells (16 bending, 8 non-bending) and a vertical extent of 1.4 m. Pure CO2 gas is used. The magnet is a split-pair design with 79 cm diameter coils and a separation of 80 cm. During the 1998 flight, the central field was 0.8 T (60% of the full design field). Presented are results from flight data, for a range of incident particle Z, on the spatial resolution and efficiency of the tracking system, and on the maximum detectable rigidity (MDR) of the spectrometer. For in-flight data, spatial resolutions of 54 mm for Z=2 and 45 mm for Z=4 are obtained. An MDR of 970 GV/c is achieved for Z=2.

Item Type:Book Section
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URLURL TypeDescription
Christian, E. R.0000-0003-2134-3937
Geier, S.0000-0002-3948-9339
Hof, M.0000-0003-2884-3037
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© University of Utah. Provided by the NASA Astrophysics Data System.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-46
Record Number:CaltechAUTHORS:20150217-133746665
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54878
Deposited By: Deborah Miles
Deposited On:20 Feb 2015 03:21
Last Modified:09 Mar 2020 13:18

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