Dynamics of X-Pinches on the Llampuedken Generator at 400kA
- Departamento de Fisica, Pontificia Universidad Catolica de Chile, Casilla 306 Santiago 22 (Chile)
Results on x-pinch experiments in the Llampuedken generator at a current level of 400kA with a rise time of 260 ns are presented. Results from x-pinches of different wire numbers, diameters and of different materials are presented, including Aluminium, Titanium and Deuterated Polystyrene (CD). The matched load for the generator, in terms of x-ray output, was a two wire x-pinch of 125 {mu}m diameter. PIN diode and PCD measurements show x-ray pulses of {approx}2 ns duration with an estimated yield of 15 J from these loads. Time integrated spectra obtained with a defocusing curved crystal spectrometer showing He-like and H-like Aluminium emission are also presented. Time integrated x-ray pinhole cameras show that the x-ray emission comes frequently from several hot spots in the case of Aluminium pinches. The dynamics of the different x-pinches were compared using time resolved VUV frames from a 2 ns exposure MCP camera. This camera clearly shows the different stages of development of the x-pinches including the (vertical) axial jet formation from the crossing point to the electrodes and also horizontal ejection of material from the crossing point around the time of hot spot formation. The VUV frames from Deuterated Polystyrene (CD) x-pinches are markedly different to those obtained in the case of metallic ones. Backlighting of the CD wires in the limbs of the x-pinch by the on-axis jet, show that the limbs remain in high density form for much of the current rise. Furthermore the on axis jet is seen to be very unstable and no efficient pinching is seen at the crossing point.
- OSTI ID:
- 20729238
- Journal Information:
- AIP Conference Proceedings, Vol. 808, Issue 1; Conference: 6. international conference on dense Z-pinches, Oxford (United Kingdom), 25-28 Jul 2005; Other Information: DOI: 10.1063/1.2159343; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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