A superconducting solenoidal spectrometer for a balloon-borne experiment

Details A superconducting solenoidal spectrometer for a balloon-borne experiment A superconducting solenoidal spectrometer for a balloon-borne experiment

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nimpa.443...71a&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 443, Issue 1, p. 71-100.

Physics

40

Scientific paper

The BESS detector is a new type of balloon-borne spectrometer which utilizes various technologies recently developed for collider experiments. The principal scientific objectives include a measurement of cosmic-ray antiproton spectrum, search for anti-nuclei in cosmic radiation, and precise meaurements of cosmic-ray primaries. A thin superconducting solenoidal coil produces a uniform magnetic field of 1T. Cylindrical drift chambers are located inside and outside the coil and perform continuous tracking. The momentum resolution is 0.5% at 1GeV//c. i.e., the maximum detectable rigidity is 200GV. Scintillation counter hodoscopes, placed above and below the solenoid, provide timing and /dE/dx measurements and trigger generation. The timing resolution is 80ps/counter. This cylindrical configuration achieves a large geometrical acceptance of 0.35m2sr which is essential to detect rare cosmic-ray particles. In order to cope with high trigger rate and large data size, intelligent trigger circuits and a fast and parallel data acquision system are also developed. In 1993, the first scientific flight of the BESS apparatus was carried out and the first mass-measured antiprotons were detected at energies below 500MeV

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