Characterization of Plasma Flow Through Magnetic Nozzles

Abstract

FormApproved OMB No.0704-0188 1a. REPORT SECURITY CLASSIFICATION uNCLASSIFIED 2a.SECURITY CLASSIFICATION AUTHORITY 2b. DECLASSIFICATION/ DOWNGRADING SCHEDULE 4. PERFORMING ORGANIZATION REPORT NUMBER(S) 6a. NAME OF PERFORMING ORGANIZATION Los Alamos National Laboratory EcADDRESS (City, State, and ZIP Coda) P.Oo BOX 1663 Los Alaxnos NM87545 6b. OFFICE SYM80L (If app//cab/e) 3a. NAME OF FUNDING I SPONSORING 8b. OFFICE SYMBOL ORGANIZATION {If applicable) 3?. ADDRESS (City, State, and ZIP Code) '

Voigt regularization for the explicit time stepping of the Hall effect term

“…The effect of the Hall term on the plasma motion in the magnetic nozzle is discussed in Gerwin et al (1990). According to Gerwin et al (1990), "if all meridional magnetic field lines are held at the same electric potential, the main effect of the Hall term is to induce a small rotational motion of the plasma."…”

Magneto-Gas Kinetic Method for Nonideal Magnetohydrodynamics Flows: Verification Protocol and Plasma Jet Simulations

“…Using this fully developed axisymmetric jet as the initial condition, numerical results with an externally applied magnetic field are obtained using MGKM. Qualitative comparisons are made between the resulting flow and the theoretical predictions of Davidson [34] and Gerwin et al [35].…”

“…The computational domain is a 200 Â 64 Â 64 Cartesian grid with grid spacing in all directions equal to D=L ¼ 0:005. Gerwin predicts that the primary effect of the Hall term on a magnetic nozzle plasma jet would be to induce an azimuthal velocity [35]. The physics of the Hall term involves the demagnetization of ions, which then may travel across field lines.…”

Integrity of the plasma magnetic nozzle

“…Denoting values in the throat by subscript " t," V // t ≡ Vt = St (6) For simplicity, we shall assume infinite contraction and expansion ratios for the converging-diverging nozzle. It can be demonstrated, however, that a realistic moderate contraction ratio of 2, together with a moderate expansion ratio of 3, yields results very close to those obtained from assuming these ratios to be infinite.…”