DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 98: Ion response to Te heat pulses | ||
| Name: | Jim C. DeBoo ( |
Affiliation: | General Atomics |
| Research Area: | Transport | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Improve understanding of ion thermal transport by studying the parametric dependence of the Ti response to Te heat pulses from modulated ECH power in L-mode discharges. | ||
| Experimental Approach/Plan: | Apply modulated ECH power to an MHD-quiet, sawtooth-free, L-mode discharge with the ECH resonant off axis, rho ~ 0.7. Monitor the perturbed ion response to the electron heat pulses with CER. Vary the source strength and coupling conditions to gain insight on the key physics responsible for the ion response. Is the ion response stiff and thus independent of the drive amplitude? Scans could include ECH power to see if the ion response is linear in that driving term, collisionality (density scan to where TEMs are stable) to test if response is tied to TEM activity, and L_Ti (P_nbi scan) and Te/Ti (vary ratio of P_ech to P_nbi)to vary ITG stability. Discussions should be held to determine the best set of parameters to vary in a systematic way to achieve the goal. | ||
| Background: | Many previous modulated ECH experiments have displayed an ion response to electron heat pulses that can not be explained by simple ion-electron collisional coupling. In the past the electron behavior was always the focus of the experiments. This experiment is meant to focus on the ion response and the key physics responsible for the ion response. | ||
| Resource Requirements: | at least 4 gyrotrons | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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