Exploration of low-aspect-ratio tokamak regimes in the CDX-U and TS-3 devices
- and others
In the low-aspect-ratio tokamak regime, a lower q(a) regime (i.e. q(a) {le} 5, A = R/a {approx} 1.5) has been explored in CDX-U, and the ultra-low-aspect-ratio tokamak regime (1.05 {le} A {le} 1.5) has been explored in TS-3. Using a relatively low toroidal magnetic field, plasma discharges with I{sub p} {le} 53 kA, and q(a) {ge} 4 [q{sub cyl}(a) {ge}1] have been obtained in CDX-U. Low q(a), Ohmic plasmas in CDX-U show increasing MHD activity as the edge safety factor is lowered. These modes appear to reduce the current ramp-up rate and, at present, limit the access to even lower q(a) regimes. An experiment carried out in the ULART regime (A {approx} 1.05 {minus} 1.5) on the TS-3 device identifies a threshold of q(a) {ge} 3 with q{sub cyl}(a) < 1 for stability of global tilt/shift modes.
- Research Organization:
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 10111933
- Report Number(s):
- PPPL-CFP-3185; IAEA-CN-60/A5-II-6-2; CONF-940933-25; ON: DE95005540
- Resource Relation:
- Conference: 15. international conference on plasma physics and controlled nuclear fusion research,Madrid (Spain),26 Sep - 1 Oct 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of the ultra low aspect ratio Tokamak ULART
Global stability study of the ultra low aspect ratio tokamak, ULART