The new gas-RICH-counter

This picture shows the hit pattern of the MWPC for an electron of 3.7 GV. We have in the right corner the big ionizing signal of particle, but in the middle the cherenkov-ring is clearly to see.

The Tests in the payload on ground were also succesful. The instrument was launched on may 24th, but the flight had to be stopped after 4 hours due to a leak in the gondola. The data taken during the ascent will be analyzed soon.
We proceeded with the preparations for a flight in september 1997 from Ft. Sumner. Due to problems with the magnet (the first problems in 20 years !) the campagne had to be cancelled. In winter 1997/98 the magnet was repaired.
We headed for Ft. Sumner in the spring of 1998. The CAPRICE2-payload was launched on the 17th may 1998, but due to a failure of the balloon collar the flight was terminated after one hour.
We could recover the experiment in excellent condition and were ready for a new attempt just 10 days later. On the 28th of may 1998 we finally had a successful flight with 22 hours at float (about 120000 ft). ( map of the flight route).

This picture shows how nicely the RICH can separate the particles in combination with the spectrometer. We plot the cherenkov angle vs. the deflection for ascent data of the 1998 flight.

Look what's going on in Ft. Sumner during the spring/fall campaigns at the NSBF Ft. Sumner page .
Check the live SPY-Cam of NSBF Ft. Sumner on launch days.
CAPRICE 97 at launch (20kB JPG) CAPRICE 98 at launch (150 kB GIF)


  • New Mexico State University
  • Tata Institute of Fundamental Research, Bombay
  • Goddard Space Flight Center
  • Royal Institute of Technology, Stockholm
  • Centre de Recherches Nucleaires, Strasbourg
  • Università di Perugia and INFN, Perugia
  • INFN, Laboratori Nazionali die Frascati
  • Università di Firenze and INFN, Firenze
  • Università di Roma II and INFN, Roma
  • Università di Trieste and INFN, Trieste
  • Università di Bari and INFN, Bari

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