DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
Login | Review | Submit | Logout | Help
Questions about this website? Contact Andrew LeBlanc Questions about ROF? Contact Chuck Greenfield
| Title | 323: Separating role of E x B and magnetic shear in stabilization of turbulence (DOE Milestone 166) | ||
| Name: | Keith Burrell ( |
Affiliation: | General Atomics |
| Research Area: | Transport Model Validation | Presentation time: | Not requested | Co-Author(s): | J. Kinsey |
| Description: | The goal of this work is to separate the effects of magnetic shear and
E x B shear on transport in the core of tokamak discharges. | ||
| Experimental Approach/Plan: | Create plasmas with strong negative central magnetic shear by using a
combination of early ECH and NBI heating. The goal is to create a q-profile similar to that in shot 117984. Referece shot used 4.5 MW NBI starting at 50 ms to create strong NCS discharge. Replace as much of this power with ECH as possible (5 gyrotrons desired) in order to minimize input torque. Contrast shots with all co-injected beams with balanced beams to vary the E x B shear while keeping the magnetic shear the same. Determine the effect on transport and core barrier formation. | ||
| Background: | Theoretical calculations indicate that both E x B shear and magnetic
shear can be stabilizing for the microturbulence which drive tokamak transport. Prior to 2006, it was difficult to separate these effects in experiments, since we did not have independent control of the E x B shear in negative central shear discharges. Creation of these discharges requires significant early heating, which required a substantial amount of co-NBI. The co-NBI also produced significant plasma rotation, resulting in increased E x B shear. | ||
| Resource Requirements: | 5 gyrotrons desired. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
Print this page