A MULTISTEP AVALANCHE CHAMBER WITH OPTICAL READOUT FOR USE AS A TWO-DIMENSIONAL VUV PHOTON OR PARTICLE TRACK DETECTOR - Gooch, T; Gilmore, R; Jeffery, D; Kwan, W; Llewellyn, T; Mcarthur, I; Malos, J; Tapper, R (NUCLEAR INSTRUMENTS and METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1985)