Abstract
Preliminary results are presented of some tests which have been made to determine the feasibility of using an image-intensifier camera to photograph showers developing within an ionization calorimeter containing large sheets of plastic scintillator. The camera utilizes an EMI 9694B image intensifier, a four-stage cascade type with magnetic focusing. The first three stages of the intensifier are operated with a steady voltage and the last stage is pulsed. In the tests the camera is used to view the shorter edge of a sheet of Pilot Y plastic scintillator 91.5 cm × 183 cm and 2.5 cm thick. Showers of various sizes occurring within the scintillator are simulated by a nanosecond light source of appropriate size inserted into holes in the scintillator. The intensity of the source is calibrated using a photomultiplier to compare the light output of the source with that from single muons traversing the scintillator. All the tests were made with the source near the lens axis. The tests show that with the optical system anticipated to be used in the final application the threshold for shower detection seems to be sufficiently low and the image size sufficiently small to enable the system to be used over the required depth of field to obtain space and energy resolution of showers that occur simultaneously within the calorimeter with energies around 10 TeV.
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