Enhancement of soft X-ray emission from a pinch plasma using a rotating plasma for pre-ionization

Ohzu, Akira

doi:10.1016/s0030-3992(00)00084-0

Cited by 10 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[8][9][10][11][12][13][14][15][16] The x-ray emission from a given PF device depends in a rather complicated way upon the design and operating parameters such as the operating voltage and bank energy, [17][18][19] the circuit inductance, 20 the working gas nature and pressure, 12,16,21 the anode dimensions, shape, and material, [22][23][24][25][26][27] the material and configuration of insulator sleeve, 28 and preionization assisted breakdown. 29,30 It is reported that when the plasma focus is operated in hydrogen with small admixture of inert gases, the x-ray emission is strongly enhanced. 9 From the aforementioned works, it is clear that the appropriate choice of various machine parameters can enhance the x-ray yield to many folds.…”

Section: Introductionmentioning

confidence: 99%

Effect of insulator sleeve material on the x-ray emission from a plasma focus device

et al. 2010

View full text Add to dashboard Cite

The effect of insulator sleeve material on x-ray emission from a 2.3 kJ Mather type plasma focus device operated in argon-hydrogen mixture is investigated. The time and space resolved x-ray emission characteristics are studied by using a three channel p-i-n diode x-ray spectrometer and a multipinhole camera. The x-ray emission depends on the volumetric ratio of argon-hydrogen mixture as well as the filling pressure and the highest x-ray emission is observed for a volumetric ratio 40% Ar to 60% H 2 at 2.5 mbar filling pressure. The fused silica insulator sleeve produces the highest x-ray emission whereas nonceramic insulator sleeves such as nylon, Perspex, or Teflon does not produce focus or x-rays. The pinhole images of the x-ray emitting zones reveal that the contribution of the Cu K␣ line is weak and plasma x-rays are intense. The highest plasma electron temperature is estimated to be 3.3 and 3.6 keV for Pyrex glass and fused silica insulator sleeves, respectively. It is speculated that the higher surface resistivity of fused silica is responsible for enhanced x-ray emission and plasma electron temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of insulator sleeve material on the x-ray emission from a plasma focus device

et al. 2010

View full text Add to dashboard Cite

show abstract

“…It has been successfully employed in different fields like lithography (0.9-1.5 keV) [10], microscopy (0.25-2.5 keV) [11] and micromachining (4 keV) [12], radiography and an ion source for material processing and thin film deposition [13]. In the last few years, attempts have been made to enhance X-ray yield from plasma focus by adjusting different parameters, such as capacitor energy, charging voltage, circuit inductance, nature and pressure of working gases, material and shapes of electrodes, proper selection of anode length and insulator, and preionization before initial discharge in addition to normal operating conditions [14][15][16][17][18][19][20]. Enhanced X-ray emission has been observed from stable pinched plasma obtained by minimizing the axial and azimuthally nonuniformities during plasma pinching [21].…”

Section: Introductionmentioning

confidence: 99%

Soft X-ray emission from preionized He plasma in a 3.3 kJ Mather type plasma focus device

Khan

Shafiq

Hussain

et al. 2009

Plasma Devices and Operations

View full text Add to dashboard Cite

Soft X-ray emission from He plasma in a 3.3 kJ plasma focus system is investigated without and with preionization by α particles. Silicon PIN diodes and a multi-pinhole camera with absorption filters are employed for time-resolved and time-integrated X-ray analyzes, respectively. X-ray emission in 4π geometry is measured as a function of He gas filling pressures. The highest soft X-ray yield, of 0.25 ± 0.01 J, is obtained at a filling pressure of 125 Pa without preionization, which increases to 0.50 ± 0.02 J with preionization at a filling pressure of 150 Pa. The total X-ray yield without preionization, 1.50 ± 0.07 J, is observed at a filling pressure of 125 Pa and this is enhanced to 2.44 ± 0.11 J with preionization at a filling pressure of 150 Pa. The preionization makes the focus filament symmetric and enhances its volume.

show abstract

“…It is a well-known fact that the production of stable pinch plasma by minimizing the axial and azimuthal non-uniformities leads to enhanced soft and hard X-ray emission [13]. The reduction of the non-uniformities and the increased stability of the pinch plasma depend on the conditions of pre-ionization before the initial phase of the subsequent discharge [14].…”

mentioning

confidence: 99%

“…The neutron yield was found to increase up to 25% provided the strength of the β-source does not cross a certain critical limit. Akira [13] has studied the enhancement of soft X-ray emission from pinch plasma by using rotating plasma for pre-ionization. The rotating plasma was produced by a pulsed J ×B cross-field discharge between coaxial electrodes.…”

mentioning

confidence: 99%

Enhanced and reproducible X-ray emission in a low-energy plasma focus

Ahmad¹,

Sadiq²,

Hussain³

et al. 2006

Europhys. Lett.

View full text Add to dashboard Cite

The effect of pre-ionization by a shunt resistor on X-ray emission performance from a low-energy (2.7 kJ) plasma focus is investigated by employing time-resolved and time- integrated detectors. Different shunt resistors are employed and 71 MΩ is found the most appropriate in this experiment. It is estimated that with pre-ionization 49.56 J of energy is radiated as X-rays, out of which 21.5 J is in the form of Cu-Kα lines in 4π-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.

show abstract

Enhancement of soft X-ray emission from a pinch plasma using a rotating plasma for pre-ionization

Cited by 10 publications

References 14 publications

Effect of insulator sleeve material on the x-ray emission from a plasma focus device

Effect of insulator sleeve material on the x-ray emission from a plasma focus device

Soft X-ray emission from preionized He plasma in a 3.3 kJ Mather type plasma focus device

Enhanced and reproducible X-ray emission in a low-energy plasma focus

Contact Info

Product

Resources

About