PMID- 33820041
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20210406
IS  - 1089-7623 (Electronic)
IS  - 0034-6748 (Linking)
VI  - 92
IP  - 3
DP  - 2021 Mar 1
TI  - A 1D Lyman-alpha profile camera for plasma edge neutral studies on the DIII-D 
      tokamak.
PG  - 033523
LID - 10.1063/5.0024115 [doi]
AB  - 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  approximately 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.
FAU - Rosenthal, A M
AU  - Rosenthal AM
AUID- ORCID: 0000000261491136
AD  - MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
FAU - Hughes, J W
AU  - Hughes JW
AUID- ORCID: 0000000348024944
AD  - MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
FAU - Bortolon, A
AU  - Bortolon A
AUID- ORCID: 0000000200940209
AD  - Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
FAU - Laggner, F M
AU  - Laggner FM
AUID- ORCID: 0000000316012973
AD  - Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
FAU - Wilks, T M
AU  - Wilks TM
AUID- ORCID: 000000029675678X
AD  - MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
FAU - Vieira, R
AU  - Vieira R
AD  - MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
FAU - Leccacorvi, R
AU  - Leccacorvi R
AD  - MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
FAU - Marmar, E
AU  - Marmar E
AD  - MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
FAU - Nagy, A
AU  - Nagy A
AD  - Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
FAU - Freeman, C
AU  - Freeman C
AD  - Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
FAU - Mauzey, D
AU  - Mauzey D
AD  - Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Rev Sci Instrum
JT  - The Review of scientific instruments
JID - 0405571
SB  - IM
EDAT- 2021/04/07 06:00
MHDA- 2021/04/07 06:01
CRDT- 2021/04/06 01:00
PHST- 2021/04/06 01:00 [entrez]
PHST- 2021/04/07 06:00 [pubmed]
PHST- 2021/04/07 06:01 [medline]
AID - 10.1063/5.0024115 [doi]
PST - ppublish
SO  - Rev Sci Instrum. 2021 Mar 1;92(3):033523. doi: 10.1063/5.0024115.