DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 17: Mixed Gas MGI | ||
| Name: | John C. Wesley ( |
Affiliation: | General Atomics |
| Research Area: | Disruptions | Presentation time: | Requested | Co-Author(s): | Team MGI |
| Description: | Conduct systematic study of mixed gas massive gas injection (MGI) using the six-valve MEDUSA injector. eg H2 + 1% to 20% Ar, at Q_in = 2000 torr-l. Quantify effects of variation in low-Z carrier gases (H2, D2 or He) and Ne and/or Ar admixtures. Provide data for integrated model validations of species, impurity radiation and impurity delivery (impurity entrainment) attributes | ||
| Experimental Approach/Plan: | Injection into \'standard\' ca 1 MJ NBI heated target plasma; with a range of mixed gas make-ups. Possible injection quantity or pulse length scans to find optimal or saturation onset levels. Longer-term objective is to determine \'optimal\' carrier and admixture species and concentration. Choice of a limited set of test mixtures TBD before starting campaign(s). Also need pure D2 baseline data if eg D2 + Ar mixtures are used. | ||
| Background: | Two existing DIII-D mixed gas shots show a combination of promising and puzzling results. Lack of systematic data makes comparison with the corresponding pure gas analogs very speculative. Examples we have show significant \'disproportionate\' plasma response effects. Data will support identification of optimal and/or \'tunable\' MGI concepts for eg ITER. | ||
| Resource Requirements: | Standard MGI target plasma (2 beams), MEDUSA injector, supplies of candidate gas mixtures, between shot gas change capability. | ||
| Diagnostic Requirements: | Standard + MGI/disruption-specific diagnostics, fast camera, etc. CO2 interferometer is critical (high n*l) | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | H2 experiments may impact subsequent IC or other species sensitive experiments. Need end of week or H campaign scheduling. | ||
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