THE USE OF IMAGE INTENSIFIERS WITH STREAMER CHAMBERS.
MICHIGAN UNIV ANN ARBOR DEPT OF PHYSICS
Pagination or Media Count:
A very simple Marx generator and a streamer chamber with an active volume of 9 in x 6 in x 94 in. Streamers of any length down to less than one mm. may be obtained by adjusting the firing delay of a spark gap which shunts the chamber. With the aid of a three stage image intensifier, cosmic ray tracks were successfully recorded on 35 mm. Kodak Tri-X film. Streamers of 5 mm. were recorded comfortably with a front lens opening of f16 while the much fainter 1 mm. streamers require an opening of f4.5 or less. A coincidence pulse from the counters located above and below the chamber initiates the triggering functions of the avalanch transistor, the EFP60, and the 5D21 tube which delivers a 7 kv pulse to the trigger electrode of the first stage of the Marx generator. The 101 mm. Wollensak lens images onto the first cathode of the tube the direct view of the streamers normal to the electric field together with the end view, which is parallel to the field and is reflected to the lens by means of a mirror. A pair of 76 mm. f0.87 Super Farron lenses couples the output of the image intensifier to the film with unity magnification, while the demagnification of the entire system is about 101.