Z-trigger system with the BELLE central drift chamber

M. Tomoto, T. Ohshima, S. Suzuki, A. Sugiyama, K. Yoshida, T. Matsumoto, T. Okabe, A. Ishikawa, K. Inami, I. Nagai, M. Hirose, K. Fujimoto, A. Sugi, M. Akatsu, Y. Sakai, S. Uno, Y. Iwasaki, J. Suzuki, N. Ujiie, Y. FujitaK. K. Joo, O. Nitoh, H. Hirano

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We describe the design and performance of a fast Z-trigger system with the BELLE Central Drift Chamber. It utilizes z-position information from the axial/stereo wire hits as well as the cathode strip. This system is essential to reduce the false trigger rate from caused by the spent electrons or positrons interacting with the material around the beam pipe. We tested the performance of the system using cosmic rays in a magnetic field of 1.5 T, provided by a superconducting solenoid. The trigger efficiency was 98% for a single track passing through the interaction region. This trigger was effective in rejecting tracks originating from points more than 10 cm away from the interaction point.

Original languageEnglish
Pages (from-to)416-423
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
Publication statusPublished - 2000 Jun 11
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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