High-resolution Tangential AXUV Arrays for Radiated Power Density Measurements on NSTX-U

Conference · Tue Jul 01 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4870282· OSTI ID:1172627

Delgado-Aparicio, L ^[1]; Bell, R E ^[1]; Faust, I ^[2]; Tritz, K ^[3]; Diallo, A ^[1]; Gerhardt, S P ^[1]; Kozub, T A ^[1]; LeBlanc, B P ^[1]; Stratton, B C ^[1]

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1. PPPL
2. MIT
3. The Johns Hopkins University, Baltimore, MD, 21209, USA

Precise measurements of the local radiated power density and total radiated power are a matter of the uttermost importance for understanding the onset of impurity-induced instabilities and the study of particle and heat transport. Accounting of power balance is also needed for the understanding the physics of various divertor con gurations for present and future high-power fusion devices. Poloidal asymmetries in the impurity density can result from high Mach numbers and can impact the assessment of their flux-surface-average and hence vary the estimates of P[sub]rad (r, t) and (Z[sub]eff); the latter is used in the calculation of the neoclassical conductivity and the interpretation of non-inductive and inductive current fractions. To this end, the bolometric diagnostic in NSTX-U will be upgraded, enhancing the midplane coverage and radial resolution with two tangential views, and adding a new set of poloidally-viewing arrays to measure the 2D radiation distribution. These systems are designed to contribute to the near- and long-term highest priority research goals for NSTX-U which will integrate non-inductive operation at reduced collisionality, with high-pressure, long energy-confinement-times and a divertor solution with metal walls.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: DE-AC02-09CH11466
• OSTI ID: 1172627
• Report Number(s): PPPL-5038
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 4; Conference: 20th Topical Conference on High Temperature Plasma Diagnostics (HTPD 2014), Atlanta, Georgia, June 1-5, 2014; ISSN 0034--6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Diagnostics
impurities
Radiation detectors