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

被引：23
|
作者：
Rosenthal, A. M. [1 ]
Hughes, J. W. [1 ]
Bortolon, A. [2 ]
Laggner, F. M. [2 ]
Wilks, T. M. [1 ]
Vieira, R. [1 ]
Leccacorvi, R. [1 ]
Marmar, E. [1 ]
Nagy, A. [2 ]
Freeman, C. [2 ]
Mauzey, D. [2 ]
机构：
[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2021年 / 92卷 / 03期
关键词：
Mirrors - Tokamak devices - 3D printers - Pinhole cameras;
D O I：
10.1063/5.0024115
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A one dimensional, absolutely calibrated pinhole camera system was installed on the DIII-D tokamak to measure edge Lyman-alpha (Ly-alpha) 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 similar to 2 cm full width at half maximum (FWHM) with a total coverage of 22 cm. Each camera consists of a rectangular pinhole, Ly-alpha reflective mirror, narrow-band Ly-alpha transmission filter, and a 20 channel AXUV photodetector. The combined mirror and transmission filter have a FWHM of 5 nm, centered near the Ly-alpha wavelength of 121.6 nm 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-alpha 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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页数：10
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