Runaway-loss induced negative and positive loop voltage spikes in the Aditya Tokamak

Journal Article · Wed Sep 15 04:00:00 EDT 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3474949· OSTI ID:21432278

Paradkar, Bhooshan; Ghosh, J; Chattopadhyay, P K; Tanna, R L; Raju, D; Bhatt, S B; Rao, C V. S.; Joisa, Sankar; Banerjee, Santanu; Manchanda, R; Gupta, C N; Saxena, Y C ^[1]

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1. Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

Negative spikes followed by positive ones in the loop voltage signal during the discharge are observed in the Aditya Tokamak [S. B. Bhatt et al., Indian J. Pure Appl. Phys. 27, 710 (1989)]. These spikes are always accompanied by hard x-ray bursts caused by sudden loss of runaway electrons. The observed growth of m=3 mode seemed responsible for the losses of localized beams of runaway electrons (E{sub {gamma}{approx}1}-5 MeV) from the plasma region around q=3 magnetic surface. The movement of these runaway electrons during their extraction from inside the plasma induces both positive and negative electric fields at those locations. In this paper, a one-dimensional toroidal electric field diffusion model is used to estimate the induced electric field at the plasma boundary, which matches quite well with the observed spikes in loop voltage in both magnitude as well as its temporal evolution.

• OSTI ID: 21432278
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 17; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ADITYA TOKAMAK
CLOSED PLASMA DEVICES
ELECTRIC DISCHARGES
ELECTRIC FIELDS
ELECTRIC POTENTIAL
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HARD X RADIATION
IONIZING RADIATIONS
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC SURFACES
PLASMA
RADIATIONS
RUNAWAY ELECTRONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
X RADIATION