Abstract
The magnetic field distribution substantially affects mechanisms for the generation of radiation in Z-pinches. Investigation of the axial component of the magnetic field is one of the important problems in plasma focus studies. The designed magnetic probe is intended to use for the study of current sheet in INTI plasma focus device with energy of about 3.3 kJ. The measurements of the azimuthal component of the magnetic field on the INTI Plasma Focus operated at neon pressures below 1 Torr was carried out using a custom built calibrated magnetic probe. The probe was tested for neon gas under the various lower pressures (i.e., 0.1, 0.3, 0.5 and 0.7, 1, 2, 3, 5 torr etc.). It is observed that the time response of the designed probe is sufficient for the rise time of the magnetic field associated with the current in the axial phase. We also note that the small size of the designed probe is well suited to sense the magnetic field without perturbing the plasma unduly. The probe designed and constructed is also suitable to carryout measurements to obtain axial distributions of trajectory, average axial velocity and magnetic field of the current sheath at a certain radial distances along the axis of the tube.
Highlights
A plasma focus produces plasma of high energy density with emission of intense beams of charged particles and radiation and neutrons when operated in deuterium
The development process of current sheath in the Mather type plasma focus devices can be divided into three main phases as Initial breakdown, Axial acceleration and Radial collapse
In this study we study current sheath dynamics on the INTI plasma focus device (Saw et al, 2010, 2012; Lee et al, 2011) using magnetic probe technique for various gas pressures of neon
Summary
A plasma focus produces plasma of high energy density with emission of intense beams of charged particles and radiation and neutrons when operated in deuterium. It becomes a laboratory for fundamental and applied research related to fusion, neutron production, hard and high brightness soft x-ray production and astrophysical phenomena (Bernard et al, 1998; Soto, 2005; Lee, 2011). The development process of current sheath in the Mather type plasma focus devices can be divided into three main phases as Initial breakdown, Axial acceleration and Radial collapse. The initial gas break down between the inner electrode (anode) and the back plate of the focus tube forms weak current filaments. The current filaments at the inner surface of the outer electrode blend to form a uniform, homogeneous and azimuthally symmetric current sheath which is lifted off the insulator surface by the
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