Measurements of divertor target plate conditions and their relationship to scrape-off layer transport

Cross-field filamentary transport in the scrape-off layer (SOL) is important for controlling SOL profiles, main-chamber recycling fluxes, and divertor operation. However, questions remain about the extent to which divertor target conditions play a role in setting transport levels. The Alcator C-Mod SOL is well diagnosed and extensively characterized, making it an ideal platform to assess the impact of divertor target conditions on SOL filamentary transport and the resultant upstream profiles, in particular, density shoulder formation. To facilitate the investigation, a set of high heat flux handling, flush-mounted rail Langmuir probes were designed for the Alcator C-Mod divertor. They were validated and proved to be robust, reliable diagnostics. Main chamber SOL fluctuations and density profiles were observed and found to be strongly correlated with divertor target conditions when the core plasma Greenwald fraction was increased.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2019

Author dc:creator

• Kuang, Adam QingYang.

Advisor dc:contributor.advisor

• Brian L. LaBombard.

• Nuclear Science and Engineering.

Statement dc:rights

• MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/127707

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/127707