Comparative measurement of the neutral density and particle confinement time in EBT

The neutral density and particle confinement time in the ELMO Bumpy Torus-Scale Experiment (EBT-S) have been determined by two different techniques. These involve a spectroscopic measurement of molecular and atomic hydrogen emissions and a time-decay measurement of a fast-ion population using a diagnostic neutral beam. The results from both diagnostics exhibit identical trends for either estimate, although the absolute values differ by a factor of 2 to 3. The observed variations with fill gas pressure and microwave power from either technique are consistent with measurements of electron density and temperature. In this paper, the measurement techniques are discussed, and the results are compared in the context of consistency with independently observed plasma behaviour.

Download Full-text

Stationary burning: Analysis of profile effects on the required exhaust efficiency and the permitted helium particle confinement time

Journal of Nuclear Materials ◽

10.1016/0022-3115(90)90139-e ◽

1990 ◽

Vol 176-177 ◽

pp. 756-762 ◽

Cited By ~ 13

Author(s):

D. Reiter ◽

G.H. Wolf ◽

H. Kever

Keyword(s):

Confinement Time ◽

Particle Confinement

Download Full-text

Numerical determination of the ambipolar electric field in a stellarator-reactor plasma

Journal of Plasma Physics ◽

10.1017/s0022377800014227 ◽

1989 ◽

Vol 42 (1) ◽

pp. 133-151 ◽

Cited By ~ 2

Author(s):

W. D. D'Haeseleer ◽

W. N. G. Hitchon ◽

J. L. Shohet

Keyword(s):

Electric Field ◽

Parametric Study ◽

Parameter Range ◽

Confinement Time ◽

Numerical Determination ◽

Algebraic Condition ◽

Order Of Magnitude ◽

Numerical Parametric Study ◽

Particle Confinement

A numerical parametric study of the radial ambipolar electric field in a stellarator reactor has been undertaken. With the numerical neoclassical code FLOCS (Flow Code for Stellarators), which is capable of handling both ions and electrons of all relevant kinetic energies, the radial ambipolar field (Er)AMB is determined from the algebraic condition that ion and electron fluxes are equal. As expected, the potential is of the same order of magnitude as the temperature. Somewhat surprisingly at first sight, however, the potential does not change much with the temperature (in the parameter range under consideration), being somewhat insensitive to moderate variations of T. An explanation for this behaviour is presented. Finally, the radial particle fluxes, consistent with the obtained (Er)AMB, and the particle confinement time are computed.

Download Full-text

Anisotropic effects on classical particle confinement time in field-reversed configurations

Plasma Physics and Controlled Fusion ◽

10.1088/0741-3335/37/2/006 ◽

1995 ◽

Vol 37 (2) ◽

pp. 137-143 ◽

Cited By ~ 1

Author(s):

R A Clemente ◽

R G F Cesar

Keyword(s):

Classical Particle ◽

Confinement Time ◽

Particle Confinement ◽

Field Reversed Configurations

Download Full-text

Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D

Nuclear Fusion ◽

10.1088/0029-5515/54/11/114011 ◽

2014 ◽

Vol 54 (11) ◽

pp. 114011 ◽

Cited By ~ 9

Author(s):

B.A. Grierson ◽

K.H. Burrell ◽

A.M. Garofalo ◽

W.M. Solomon ◽

A. Diallo ◽

...

Keyword(s):

Confinement Time ◽

Impurity Particle ◽

Particle Confinement

Download Full-text

New Method of Particle Confinement Time Measurement in RF Traps

Japanese Journal of Applied Physics ◽

10.1143/jjap.39.l246 ◽

2000 ◽

Vol 39 (Part 2, No. 3A/B) ◽

pp. L246-L248 ◽

Cited By ~ 2

Author(s):

Mitsutoshi Aramaki ◽

Youichi Sakawa ◽

Tatsuo Shoji

Keyword(s):

Time Measurement ◽

New Method ◽

Confinement Time ◽

Particle Confinement

Download Full-text

Theoretical calculation of electron density and temperature in the edge of tokamak

Modern Physics Letters B ◽

10.1142/s0217984917501962 ◽

2017 ◽

Vol 31 (17) ◽

pp. 1750196 ◽

Cited By ~ 1

Author(s):

Muhammad Asif ◽

Anila Asif

Keyword(s):

Theoretical Calculation ◽

Electron Density ◽

Langmuir Probe ◽

Temporal Evolution ◽

Edge Plasma ◽

Confinement Time ◽

Electron Density And Temperature ◽

Particle Confinement ◽

Good Agreement ◽

Probe Array

In this work, we use a method based on the concept of particle confinement time [Formula: see text] uniqueness to calculate the electron density and temperature in ohmically heated, edge plasma of the Hefei tokamak-7. Here, with the help of the data taken from Johnson and Hinnov’s table, we have done an extensive work to find electron densities and temperatures that satisfy the [Formula: see text] uniqueness to evaluate the temporal evolution of electron density [Formula: see text] and temperature [Formula: see text]. The results are in good agreement as measured from the Langmuir probe array in previous works.

Download Full-text