Explosively driven magnetic compression (MFC) has been object of research for more than three decades. Actual interest in the basic physical picture of flux compression has been heightened by a newly started Multi University Research Initiative. The emphasis is on helical flux compression generators comprising a hollow cylindrical metal liner filled with high explosives and at least one helical coil surrounding the liner. After the application of a seed current, magnetic flux is trapped and high current is generated by moving, i.e. expanding, the liner explosively along the winding of the helical coil. Several key factors involved in the temporal development can be addresses by optical diagnostics: (1) The uniformity of liner expansion is captured by framing camera photography and supplemented by laser illuminated high spatial and temporal resolution imaging. Also, x-ray flash photography is insensitive to possible image blur by shockwaves coming from the exploding liner. (2) The thermodynamic state of the shocked gas is assessed by spatially and temporally resolved emission spectroscopy. (3) The moving liner/coil contact point is a possible source of high electric losses and is preferentially also monitored by emission spectroscopy. Since optical access to the region between liner and coil is not always guaranteed, optical fibers can be used to extract light from the generator. The so gained information will give, together with detailed electrical diagnostics, more insight in the physical loss mechanisms involved in MFC.
|Number of pages||4|
|State||Published - 1999|
|Event||12th IEEE International Pulsed Power Conference - Monterey, CA, USA|
Duration: Jun 27 1999 → Jun 30 1999
|Conference||12th IEEE International Pulsed Power Conference|
|City||Monterey, CA, USA|
|Period||06/27/99 → 06/30/99|