Film protection in the radiographic experiments studying the liner compressed by magnetic field of the disk generator with the mass of /spl sim/100 kg

One of the most effective ways to get the high energy densities state of a substance (pressure and temperature) is a fast compression of cylindrical Al-liners by an ultrahigh magnetic field, used for compression of the materials being studied. VNIIEF has developed a disk explosive magnetic generator (DEMG) with an electrical-explosive way of energy delivery to the load with an imploding liner, that permits to shape in this load the pulses of current with the amplitude from 30 to 35 MA and with a regulated rise time from 1.5 to 4 /spl mu/s. The axial and radial radiography of the compressed liner is the most informative technique, studying the dynamic characteristics of the liner (velocity, symmetry, instabilities, amplitude, etc...). The difficulty in using radiography in the DEMG experiments is connected with a big amount (/spl sim/100 kg) of explosive in the generator and with a high magnetic field in a transmission line from DEMG to the load. This magnetic field accelerates the fragments of a reverse conductor above the liner up to high velocities. The protection system is described, that permits protection of the X-ray film cassettes both from the shock waves effect and from the transmission line conductors fragments. The film protection is ensured by means of fast-operation explosive shutters, the elements of passive protection, and also it is ensured by the use of a capsule of some special shape with the X-ray film placed inside it. This allows provision of a free flight of the capsule out of the explosion zone without any damage to the film.