Abstract
Kascade is a large detector which is being built on the site of the Karlsruhe Nuclear Research Centre to study extensive air showers initiated by high energy cosmic ray particles in the atmosphere. The aim of the experiment is to obtain information about the chemical composition of primary cosmic rays in the energy range 500 TeV to 10 PeV, where little if anything is known at present. Special features of Kascade, as compared with previous experiments on extensive air showers, are the capability of registering many variables of a shower simultaneously and a very high rate of sampling. The design of the experiment, its present status and predicted performance are described.