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 | 224: | ||
| Name: | Pete Politzer ( |
Affiliation: | General Atomics |
| Research Area: | Fully Noninductive High Beta Operation | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Determine the nature of the broadband MHD turbulence that occurs in high beta_p noninductive (HBPNI) plasmas and which limits confinement. | ||
| Experimental Approach/Plan: | Establish an optimized HBPNI discharge. During the early part of the NI phase, when the MHD is active, use the density and Te fluctuation diagnostics in conjunction with magnetics (Mirnov and MSE) to characterize the spatial location, mode structure, and spectral properties of these fluctuations. Correlate the modes with variations in current and pressure profile widths. | ||
| Background: | In HBPNI discharges, the plasma profile evolution in the first second or two of the NI phase is slow, and beta rises slowly as well. During this phase broadband MHD turbulence is seen (noticed after the experiment). After a period of evolution, the MHD turbulence disappears, the confinement improves noticeably, and the beta rises more rapidly. Understading this process will help to eliminate it and improve the ultimate performance of these plasmas. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
Print this page