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 | 96: Determine Adiabatic Electron Response for High-n Modes in QH Plasmas | ||
| Name: | Raffi Nazikian ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Energetic Particles | Presentation time: | Requested | Co-Author(s): | G.J. Kramer, N.N. Gorelenkov, M. VanZeeland, G. Fu, W.W. Heidbrink |
| Description: | Long Pulse QH mode plasmas will be produced (ref. 128530) in order to obtain a long time evolution of the central safety factor. High-n RSAEs will be generated with a large range of poloidal wavenumbers over the range of qmin obtained. Radial scans of the upgraded BES radial array with ECE measurements will be obtained. The radial eigenmode structure of the high-n modes and the ratio of electron temperature to density fluctuations will be determined across the mode radial width. | ||
| Experimental Approach/Plan: | Current in the reverse Ip direction will be generated to obtain the conventional QH mode at high toroidal field (2.0T). Low density will be obtained for ECE measurements. BES radial array measurements will be taken in a scan from the edge to the core. | ||
| Background: | A PRL was published by Nazikian in 2006 on the thermal excitation of high-n RSAEs in DIII-D. Even at this time it was evident that the mode structure may not conform to ideal MHD expectations. More recent studies indicate that there is a major discrepancy between ideal MHD and the measured mode structure. The observations on DIII-D for both Te and ne can contribute fundamental new information on the adiabatic nature of the electrons in these high-n modes and on the role of compression over displacement in the mode characterization. | ||
| Resource Requirements: | QH mode plasma needed. One reproducible discharge required. | ||
| Diagnostic Requirements: | BES, ECE, ... | ||
| Analysis Requirements: | NOVAK, M3D, TRANSP, | ||
| Other Requirements: | -- | ||
Print this page