Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3441k&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
2
Scientific paper
Two calibration neutron monitors were completed in September 2002. We describe the performance of one of them on its voyage with the US/Australian 3NM64 neutron monitor from Seattle to McMurdo, Antarctica, and back, from 4 November 2002 to 19 April 2003. An accompanying paper discusses the calibration of the Sanae and Hermanus neutron monitors with the second calibrator. 2. Introduction At the 27th ICRC in 2001, plans were described by Moraal et al. (2001) to construct a mobile neutron monitor to intercalibrate the world's network of neutron monitors. The main objective of this intercalibration is to derive intensity spectra from differential response functions. This will provide continuous spectral information about cosmic ray modulation to at least one decade higher in energy than is presently available. The design specification was that one should be able to calibrate neutron monitor count rates to within ±0.2% to produce spectra with an acceptable level of uncertainty. The requirements for, and the expected performance of, such a calibrator were described in detail in that paper. Two of these neutron monitors were completed in September 2002, with the following final design: The counter is a 3 He filled tube of the type LND25382, 51 mm in diameter and 652 mm long. It is surrounded by a polyethylene moderator with inner and outer diameters of 60.5 and 99.5 mm, a lead producer with diameters 101 and 193 mm, and finally an outer reflector with diameters 194 and 350 mm. All these cylinders are 653 mm long. The front and back of the counter are covered with 50 mm polyethylene ends with a diameter of 350 mm. The total active length of the monitor therefore is 653 + 100 = 753 mm. Its mass is 201 kg, of which 145 kg is lead. It rests on a cradle with steerable wheels, and the total mass with cradle is 223 kg. The system records the number of counts, baromet-
Bieber John W.
Clem John Mason
Duldig Marc L.
Evenson Paul A.
Humble John E.
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