Detectors of TRISTAN experiments

On November 19, 1986, since the first electron-positron collision reaction was observed, TRISTAN has been operated smoothly, and still at present while the beam intensity is increased gradually, experiment is carried out. The results on elementary particle physics obtained so far at TRISTAN have been reported in detail. In this report, the measuring instruments used for the experiment of TRISTAN are described. Generally in the experiment of high energy physics, by measuring the information of the particles generated by elementary particle reaction, namely the kinds of particles energy, momentum vectors and so on, the pursuit of the basic law at the deep level for the interaction among elementary particles is carried out. In the experiment of TRISTAN, it is necessary to do efficient observation over the solid angle as wide as possible. The objects of direct measurement in TRISTAN are only charged particles and photons. There are three measuring instruments in TRISTAN, that is, AMY, TOPAZ and VENUS. The measurement of the momentum of charged particles, calorimeters for measuring energy and the identification of particles are reported. (K.I)