Comparison of Measured and Computed Neutron Yield from PF1000 Plasma Focus Device Operated with Deuterium Gas

2021 ◽  
pp. 109633
Author(s):  
Mohamad Akel ◽  
Pavel Kubes ◽  
Marian Paduch ◽  
Sing Lee
Keyword(s):  
Plasma Focus ◽  
Neutron Yield ◽  
Plasma Focus Device ◽  
Deuterium Gas

Calibration of Activation Counter by a 2.48 kJ Plasma Focus Device

2010 ◽  
Author(s):  
Sahar Rajabi Moghadam ◽  
Fereydoon Abbasi Davani ◽  
Babak Shirani Bidabadi
Keyword(s):  
Neutron Source ◽  
Plasma Focus ◽  
Neutron Yield ◽  
Plastic Scintillator ◽  
Plasma Focus Device ◽  
Removal Method ◽  
Deuterium Gas ◽  
Silver Activation Counter

A silver activation counter has been constructed by plastic scintillator plates along with silver foils for determination the neutron yield of a 2.48kJ plasma focus device, SBUPF1. This counter was calibrated by source removal method with an Am-Be 5 Ci neutron source which was placed above the anode of plasma focus device. Deuterium gas up to 8mbar pressure was injected to this device, and the neutron yield produced by pulsed D-D fusion of plasma focus device was measured by the counter. the neutron yield of SBUPF1 in 8mbar pressure was obtained 3.71±0.32×107 neutrons per shot. This result has relatively agreed with the neutron yield measured by silver activation Geiger counters.

A neutron source with 1014 DT neutron yield

2019 ◽  
Vol 28 (11) ◽  
pp. 1950097 ◽  
Author(s):  
Yasar Ay
Keyword(s):  
Neutron Source ◽  
Plasma Focus ◽  
Neutron Yield ◽  
Pressure Range ◽  
Gas Pressure ◽  
Plasma Focus Device ◽  
Operational Conditions ◽  
Rate Of Increase ◽  
Spherical Plasma ◽  
High Neutron

The developed spherical plasma focus model is used in this study to investigate the optimum neutron yield in terms of the gas pressure, cathode radius and external inductance. The optimum values for these parameters are found separately. Then, the charging voltage is varied from 25[Formula: see text]kV to 35[Formula: see text]kV with 1[Formula: see text]kV increment by using these separately found optimum values to see the rate of increase in neutron yield. While the used gas pressure range is 1–40[Formula: see text]Torr with 1[Formula: see text]Torr increment, cathode radius range is 11.5–17[Formula: see text]cm with 0.5[Formula: see text]cm increment. External inductance is varied from 10[Formula: see text]nH to 150[Formula: see text]nH with 5[Formula: see text]nH increment. The optimum values for gas pressure, cathode radius and external inductance are found to be 26[Formula: see text]Torr, 15[Formula: see text]cm and 75[Formula: see text]nH, respectively. Even though combining these separately found optimum values of pressure, cathode radius and external inductance does not necessarily form an optimized set of operational conditions for the SPF, they lead to a higher neutron yield in that while neutron yield with these separately found optimum values at 25[Formula: see text]kV charging voltage is [Formula: see text] (higher than the measured neutron yield of [Formula: see text] at 25[Formula: see text]kV), it increases to [Formula: see text], when charging voltage is increased to 35[Formula: see text]kV. Using these values shows that spherical plasma focus device can be used as a neutron source with high neutron yield (on the order of [Formula: see text]).

Numerical experimentation on focusing time and neutron yield in GN1 plasma focus machine

2014 ◽  
Vol 32 ◽  
pp. 1460325 ◽  
Author(s):  
Arwinder Singh ◽  
Sing Lee ◽  
Sor Heoh Saw
Keyword(s):  
Plasma Focus ◽  
Neutron Yield ◽  
Experimental Results ◽  
Phase Model ◽  
Current Waveform ◽  
Plasma Dynamics ◽  
Model Code ◽  
Numerical Experimentation ◽  
Deuterium Gas ◽  
Current Trace

In this paper, we have shown how we have fitted Lee's six phase model code to analyze the current waveform of the GN1 plasma focus machine working in deuterium gas. The Lee's 6-phase model codes was later configured to work between 0.5 to 6 Torr and the results of both focusing time and neutron yield was than compared with the published experimental results. The final results indicate that Lee's code, gives realistic plasma dynamics and focus properties together with a realistic neutron yield for GN1 plasma focus, without the need of any adjustable parameters, needing only to fit the computed current trace to a measured current trace.

Current sheath studies in a co-axial plasma focus gun

1972 ◽  
Vol 8 (1) ◽  
pp. 21-31 ◽  
Author(s):  
S. P. Chow ◽  
S. Lee ◽  
B. C. Tan
Keyword(s):  
Plasma Focus ◽  
High Speed ◽  
Dense Plasma ◽  
The State ◽  
Plasma Focus Device ◽  
Dense Plasma Focus ◽  
Current Sheath ◽  
Steady Propagation ◽  
Deuterium Gas

A co-axial plasma focus device is operated in deuterium gas at ambient pressures from 0·2 to 0·7 mm Hg and condenser bank voltages from 10 to 22 kV. Magnetic probing reveals an axisymmetric parabolic current sheath which propagates down the co-axial tube (steady propagation region) and collapses off the end of the co-axial gun forming a dense plasma focus. The state of the plasma just before the focusing action is very much dependent on the velocity in the steady propagation region. This velocity is experimentally studied and compared with a snow- plough theory. The collapsing phase of the current sheath is studied using high speed framing photography and current and voltage measurements. The results indicate a focus of length 1·5 cm and radius less than 1·7 mm.

Effect of cathode structure on neutron yield performance of a miniature plasma focus device

2009 ◽  
Vol 373 (30) ◽  
pp. 2568-2571 ◽  
Author(s):  
Rishi Verma ◽  
R.S. Rawat ◽  
P. Lee ◽  
S. Lee ◽  
S.V. Springham ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Neutron Yield ◽  
Plasma Focus Device ◽  
Yield Performance ◽  
Cathode Structure
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