Enhanced and reproducible X-ray emission in a low-energy plasma focusS. Ahmad1, M. Sadiq1, S. Hussain1, M. Shafiq1, P. Lee2, M. Zakaullah1 and A. Waheed3
1 Department of Physics, Quaid-i-Azam University - 45320 Islamabad, Pakistan
2 Natural Sciences Academics Group, National Institute of Education, Nanyang Technological University - 1 Nanyang Walk, 637616, Singapore
3 PINSTECH - P.O. Box 1331, 44000 Islamabad, Pakistan
received 21 July 2005; accepted in final form 2 November 2005
published online 2 December 2005
The effect of pre-ionization by a shunt resistor on X-ray emission performance from a low-energy (2.7) plasma focus is investigated by employing time-resolved and time- integrated detectors. Different shunt resistors are employed and 71 is found the most appropriate in this experiment. It is estimated that with pre-ionization 49.56 of energy is radiated as X-rays, out of which 21.5 is in the form of - lines in 4-geometry. The pre-ionization enhances the X-ray yield, broadens the working gas pressure range and improves the shot-to-shot reproducibility of the system. The pinhole images of X-ray-emitting zones indicate that the dominant X-ray emission is from the anode tip, although the emission from hot spots along the pinch axis also contributes.
52.59.Hq - Dense plasma focus.
52.58.Lq - Z-pinches, plasma focus, and other pinch devices.
© EDP Sciences 2005