Performance of large electron energy filter in large volume plasma device

• DOI: 10.1063/1.4868514
• Publication Date: 2014-03-28T00:32:14Z
• Authors: S. K. Singh; P. K. Srivastava; L. M. Awasthi; S. K. Mattoo; A. K. Sanyasi; R. Singh; P. K. Kaw
• Keywords: Electron temperature

This paper describes an in-house designed large Electron Energy Filter (EEF) utilized in the Large Volume Plasma Device (LVPD) [S. K. Mattoo, V. P. Anita, L. M. Awasthi, and G. Ravi, Rev. Sci. Instrum. 72, 3864 (2001)] to secure objectives of (a) removing presence remnant primary ionizing energetic electrons non-thermal electrons, (b) introducing a radial gradient plasma electron temperature without greatly affecting profile density, (c) providing control on scale length temperature. A set 19 independent coils EEF make variable aspect ratio, rectangular solenoid producing magnetic field (Bx) 100 G along its axis transverse ambient axial (Bz ∼ 6.2 G) LVPD, when all are used. Outside EEF, reduces rapidly 1 at distance 20 cm from center either side target source plasma. The divides LVPD into three distinct regions source, We report that (ne 2 × 1011 cm−3 Te eV) has no detectable gradients can be established with between 50 600 by controlling field. Our observations reveal role is manifested energy dependence transport enhanced caused turbulence