Axial magnetic field and toroidally streaming fast ions in the dense plasma focus are natural consequences of conservation laws in the curved axisymmetric geometry of the current sheath. II. Towards a first principles theory

2017 ◽  
Vol 24 (11) ◽  
pp. 112502
Author(s):  
S. K. H. Auluck
Keyword(s):  
Magnetic Field ◽  
Conservation Laws ◽  
Plasma Focus ◽  
First Principles ◽  
Dense Plasma ◽  
Axial Magnetic Field ◽  
Dense Plasma Focus ◽  
Current Sheath ◽  
Fast Ions

Current sheath dynamics and X-ray emission studies from sequential dense plasma focus device

2000 ◽  
Vol 28 (4) ◽  
pp. 1263-1270 ◽  
Author(s):  
R. Gupta ◽  
S.R. Mohanty ◽  
R.S. Rawat ◽  
M.P. Srivastava
Keyword(s):  
Plasma Focus ◽  
Dense Plasma ◽  
Plasma Focus Device ◽  
Dense Plasma Focus ◽  
Current Sheath ◽  
X Ray ◽  
Emission Studies

Influence of an external additional magnetic field on the formation of a plasma column in a dense plasma focus

2019 ◽  
Vol 26 (10) ◽  
pp. 102701
Author(s):  
P. Kubes ◽  
M. Paduch ◽  
M. J. Sadowski ◽  
J. Cikhardt ◽  
B. Cikhardtova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Focus ◽  
Plasma Column ◽  
Dense Plasma ◽  
Dense Plasma Focus ◽  
Additional Magnetic Field

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.

scholarly journals Dense Plasma Focus: A question in search of answers, a technology in search of applications

2014 ◽  
Vol 32 ◽  
pp. 1460315 ◽  
Author(s):  
S. K. H. Auluck
Keyword(s):  
Magnetic Field ◽  
Plasma Focus ◽  
Dense Plasma ◽  
Initial Conditions ◽  
Experimental Situation ◽  
Integrated Design ◽  
Axial Component ◽  
Dense Plasma Focus ◽  
Plasma Dynamics ◽  
Energetic Ions

Diagnostic information accumulated over four decades of research suggests a directionality of toroidal motion for energetic ions responsible for fusion neutron production in the Dense Plasma Focus (DPF) and existence of an axial component of magnetic field even under conditions of azimuthal symmetry. This is at variance with the traditional view of Dense Plasma Focus as a purely irrotational compressive flow. The difficulty in understanding the experimental situation from a theoretical standpoint arises from polarity of the observed solenoidal state: three independent experiments confirm existence of a fixed polarity of the axial magnetic field or related azimuthal current. Since the equations governing plasma dynamics do not have a built-in direction, the fixed polarity must be related with initial conditions: the plasma dynamics must interact with an external physical vector in order to generate a solenoidal state of fixed polarity. Only four such external physical vectors can be identified: the earth's magnetic field, earth's angular momentum, direction of current flow and the direction of the plasma accelerator. How interaction of plasma dynamics with these fields can generate observed solenoidal state is a question still in search of answers; this paper outlines one possible answer. The importance of this question goes beyond scientific curiosity into technological uses of the energetic ions and the high-power-density plasma environment. However, commercial utilization of such technologies faces reliability concerns, which can be met only by first-principles integrated design of globally-optimized industrial-quality DPF hardware. Issues involved in the emergence of the Dense Plasma Focus as a technology platform for commercial applications in the not-too-distant future are discussed.

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