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Title: STUDIES OF PLASMA HEATED IN A FAST-RISING AXIAL MAGNETIC FIELD (SCYLLA)

Abstract

The Scylla plasma experiment, which employs a rapidly rising magnetic field in a cylindrical mirror geometry to prcduce and heat a deuterium plasma, is described. Experimental studies of the reproducible neutron emission from the hot plasma show that the neutrons are emitted (1) in a symmetrical, bell-shaped time distribution centered on the maximum of the magnetic field, (2) from a limited region with a 2 cm axial length and a 1.5 cm diaraeter centered in the compression coll, and (3) in the radial direction with a narrow spread of energies and no significant anisotropy. The time distribution of the neutron emission is shown to be in agreement with a thermonuclear yield curve calculated for an adiabatic compression by the observed magnetic field. The neutron yield was studied as a function of deuterium pressure, capacitor-bank voltage, and nitrogen impurity. Observations of the space-time distribution of the visible light emission with a streak camera show that a strong radial "shcck" occurs at the beginning of the second half-cycle, very little light is emitted from the plasma "fireball" during the time of neutron emission, and an intense luminous flux is produced during the later stages of the discharge. The energy absorbed in eachmore » half-cycle of the dischange by the gas is presented as calculated from the incremental damping of the driving magnetic field. Observations of hard x- ray emission ( approximately 200 kev) at times of maximum dB/dt for operating pressures in the 5 to 50 micron range are contrasted with the characteristics of the neutron emission in regard to time distribution, pressure, impurities, and rf pre-excitation. Magnetic probe studies of the Scylla discharge are reported and evidence is given that the perturbing effects of the probe dominate the plasma temperature. (auth)« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Los Alamos Scientific Lab., N. Mex.
OSTI Identifier:
4164810
NSA Number:
NSA-14-022493
Resource Type:
Journal Article
Journal Name:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Additional Journal Information:
Journal Volume: Vol: 119; Other Information: Orig. Receipt Date: 31-DEC-60
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
PHYSICS; ABSORPTION; ANGULAR DISTRIBUTION; ANISOTROPY; CAMERAS; CAPACITORS; COILS; CONFINEMENT; CYLINDERS; DENSITY; DEUTERIUM; DISTRIBUTION; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; EMISSION; ENERGY; GASES; HEATING; IMPURITIES; INDUCTION; ISOTROPY; LIGHT; MAGNETIC FIELDS; MAGNETIC MIRRORS; MEASURED VALUES; NEUTRONS; NITROGEN; PHOTOGRAPHY; PINCH; PLASMA; PRESSURE; PROBES; SCHLIEREN; SCYLLA; SHOCK WAVES; THERMONUCLEAR DEVICES; THERMONUCLEAR REACTIONS; VARIATIONS; X RADIATION

Citation Formats

Boyer, K, Elmore, W C, Little, E M, Quinn, W E, and Tuck, J L. STUDIES OF PLASMA HEATED IN A FAST-RISING AXIAL MAGNETIC FIELD (SCYLLA). Country unknown/Code not available: N. p., 1960. Web. doi:10.1103/PhysRev.119.831.
Boyer, K, Elmore, W C, Little, E M, Quinn, W E, & Tuck, J L. STUDIES OF PLASMA HEATED IN A FAST-RISING AXIAL MAGNETIC FIELD (SCYLLA). Country unknown/Code not available. doi:10.1103/PhysRev.119.831.
Boyer, K, Elmore, W C, Little, E M, Quinn, W E, and Tuck, J L. Mon . "STUDIES OF PLASMA HEATED IN A FAST-RISING AXIAL MAGNETIC FIELD (SCYLLA)". Country unknown/Code not available. doi:10.1103/PhysRev.119.831.
@article{osti_4164810,
title = {STUDIES OF PLASMA HEATED IN A FAST-RISING AXIAL MAGNETIC FIELD (SCYLLA)},
author = {Boyer, K and Elmore, W C and Little, E M and Quinn, W E and Tuck, J L},
abstractNote = {The Scylla plasma experiment, which employs a rapidly rising magnetic field in a cylindrical mirror geometry to prcduce and heat a deuterium plasma, is described. Experimental studies of the reproducible neutron emission from the hot plasma show that the neutrons are emitted (1) in a symmetrical, bell-shaped time distribution centered on the maximum of the magnetic field, (2) from a limited region with a 2 cm axial length and a 1.5 cm diaraeter centered in the compression coll, and (3) in the radial direction with a narrow spread of energies and no significant anisotropy. The time distribution of the neutron emission is shown to be in agreement with a thermonuclear yield curve calculated for an adiabatic compression by the observed magnetic field. The neutron yield was studied as a function of deuterium pressure, capacitor-bank voltage, and nitrogen impurity. Observations of the space-time distribution of the visible light emission with a streak camera show that a strong radial "shcck" occurs at the beginning of the second half-cycle, very little light is emitted from the plasma "fireball" during the time of neutron emission, and an intense luminous flux is produced during the later stages of the discharge. The energy absorbed in each half-cycle of the dischange by the gas is presented as calculated from the incremental damping of the driving magnetic field. Observations of hard x- ray emission ( approximately 200 kev) at times of maximum dB/dt for operating pressures in the 5 to 50 micron range are contrasted with the characteristics of the neutron emission in regard to time distribution, pressure, impurities, and rf pre-excitation. Magnetic probe studies of the Scylla discharge are reported and evidence is given that the perturbing effects of the probe dominate the plasma temperature. (auth)},
doi = {10.1103/PhysRev.119.831},
journal = {Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D},
number = ,
volume = Vol: 119,
place = {Country unknown/Code not available},
year = {1960},
month = {8}
}