A 1D Lyman-alpha profile camera for plasma edge neutral studies on the DIII-D tokamak

Rosenthal, A. M.; Hughes, J. W.; Bortolon, A.; Laggner, F. M.; Wilks, T. M.; Vieira, R.; Leccacorvi, R.; Marmar, E.; Nagy, A.; Freeman, C.; Mauzey, D.

doi:10.1063/5.0024115

Title: A 1D Lyman-alpha profile camera for plasma edge neutral studies on the DIII-D tokamak

Journal Article · Mon Mar 08 00:00:00 EST 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0024115· OSTI ID:1779094

^[1];

^[2];

^[1]; Vieira, R. ^[1]; Leccacorvi, R. ^[1]; Marmar, E. ^[1]; Nagy, A. ^[2]; Freeman, C. ^[2]; Mauzey, D. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

A one dimensional, absolutely calibrated pinhole camera system was installed on the DIII-D tokamak to measure edge Lyman-alpha (Ly-α) emission from hydrogen isotopes, which can be used to infer neutral density and ionization rate profiles. The system is composed of two cameras, each providing a toroidal fan of 20 lines of sight, viewing the plasma edge on the inboard and outboard side of DIII-D. The cameras’ views lie in a horizontal plane 77 cm below the midplane. At its tangency radius, each channel provides a radial resolution of ~2 cm full width at half maximum (FWHM) with a total coverage of 22 cm. Each camera consists of a rectangular pinhole, Ly-α reflective mirror, narrow-band Ly-α transmission filter, and a 20 channel AXUV photodetector. The combined mirror and transmission filter have a FWHM of 5 nm, centered near the Ly-α wavelength of 121.6nm and is capable of rejecting significant, parasitic carbon-III (C-III) emission from intrinsic plasma impurities. To provide a high spatial resolution measurement in a compact footprint, the camera utilizes advanced engineering and manufacturing techniques including 3D printing, high stability mirror mounts, and a novel alignment procedure. Absolutely calibrated, spatially resolved Ly-α brightness measurements utilize a bright, isolated line with low parasitic surface reflections and enable quantitative comparison to modeling to study divertor neutral leakage, main chamber fueling, and radial particle transport.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0014264; AC02-09CH11466; AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1779094

Alternate ID(s):: OSTI ID: 1769540; OSTI ID: 1780989

Journal Information:: Review of Scientific Instruments, Vol. 92, Issue 3; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: A 1D Lyman-alpha profile camera for plasma edge neutral studies on the DIII-D tokamak

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