Role of transport versus fueling upon pedestal density (Q4 Report and Final Report)

Technical Report · Fri Sep 27 00:00:00 EDT 2019

DOI:https://doi.org/10.2172/1567992· OSTI ID:1567992

Mordijck, Saskia ^[1]; Groebner, Rich ^[2]; Hughes, Jerry ^[3]; Diallo, Ahmed ^[4]; Casali, Livia ^[2]; Laggner, Florian ^[4]; Leonard, Tony ^[2]; Moser, Auna ^[2]; Nelson, Oak ^[5]; Osborne, Tom ^[2]; Reksoatmodjo, Richard ^[1]; Rosenthal, Aaron ^[3]; Scotti, Filippo ^[6]; Sontag, Aaron ^[7]; Soukhanovskii, Vlad A. ^[6]; Wang, Huiqian ^[2]

---

1. College of William and Mary, Williamsburg, VA (United States)
2. General Atomics, San Diego, CA (United States)
3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
5. Princeton Univ., NJ (United States)
6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Fueling a future fusion reactor and the effects of fueling upon the pedestal structure is an open physics question that motivates an intensive community effort. The pedestal density is determined by a set of variables that affect both neutral dynamics as well as plasma transport. In this Joint Research Target (JRT) we are focusing on three major aspects that affect the pedestal density due to changes in fueling characteristics. This should indirectly also give us some insight into the plasma transport mechanisms in the pedestal region. The FY19 Joint Research Target brings together US expertise from multiple facilities and institutions to advance progress in this key research area. Contributions are being assembled by a number of US collaborators, in order to leverage high quality archival data from C-Mod and NSTX as well as utilize the unique capabilities of DIII-D. Overall the work explores the importance of localization of ionization as fueling source: that is, is the particle source for the discharge originating mainly in the core, pedestal, or scrape-off layer (SOL)? Specifically we are investigating three techniques for altering this localization: Variation in edge neutral opacity, see section 2, Shallow vs. deep plasma fueling, see section 3, and Closed vs. open divertor configuration, see section 4. To study these physics effects of fueling upon the pedestal structure and SOL, we also have a section highlighting new diagnostic capabilities developed during this JRT in section 1.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); DIII-D National Fusion Facility, San Diego, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: AC52-07NA27344; FC02-04ER54698; FC02-99ER54512; AC02-09CH11466; SC0014264; SC0007880; SC0019302; H11466; AC05-00OR22725
• OSTI ID: 1567992
• Report Number(s): LLNL-TR-791544; 990766; TRN: US2100398
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY