Commissioning of the Ly-α pinhole camera diagnostic at DIII-D: Towards inboard and outboard neutral density measurements

the DIII-D team

Commissioning of the Ly-α pinhole camera diagnostic at DIII-D: Towards inboard and outboard neutral density measurements

the DIII-D team

Advanced Tokamak Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The absolutely calibrated LLAMA diagnostic (LLAMA is the Lyman-Alpha Measurement Apparatus) has been recently installed on DIII-D [1, 2] to determine the neutral gas density (n₀) profile and thereby, quantify the edge particle source in deuterium plasmas. In the initial diagnostic commissioning, absolutely calibrated Ly-α brightness profiles were measured at the high field side (HFS) and low field side (LFS) in high confinement mode with forward and reversed toroidal magnetic field (B_t) direction. The deuterium n₀profiles and ionization rate profiles are reconstructed from the inverted Ly-α emissivity profiles, in combination with the electron density (n_e) and electron temperature (T_e) profiles, solving the rate equation system for the deuterium atom occupation density. LLAMA measurements exhibit HFS-LFS asymmetries in pedestal particle source, which depend on the B_tdirection highlighting the importance of scrape-off layer (SOL) drift direction and the necessity to consider the full poloidal particle source distribution in edge transport analyses.

Original language	English
Title of host publication	47th EPS Conference on Plasma Physics, EPS 2021
Publisher	European Physical Society (EPS)
Pages	41-44
Number of pages	4
ISBN (Electronic)	9781713837046
State	Published - 2021
Event	47th EPS Conference on Plasma Physics, EPS 2021 - Sitges, Spain Duration: Jun 21 2021 → Jun 25 2021

Publication series

Name	47th EPS Conference on Plasma Physics, EPS 2021
Volume	2021-June

Conference

Conference	47th EPS Conference on Plasma Physics, EPS 2021
Country/Territory	Spain
City	Sitges
Period	06/21/21 → 06/25/21

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Awards DE-AC02-09CH11466, DE-AC05-00OR22725, DE-FC02-04ER54698 and DE-SC0014264. This material is based upon work supported by the U.S. Department of Energy, Officeof Sci-

Cite this

@inproceedings{79cedf87e0eb48a991ea646fca33fade,

title = "Commissioning of the Ly-α pinhole camera diagnostic at DIII-D: Towards inboard and outboard neutral density measurements",

abstract = "The absolutely calibrated LLAMA diagnostic (LLAMA is the Lyman-Alpha Measurement Apparatus) has been recently installed on DIII-D [1, 2] to determine the neutral gas density (n0) profile and thereby, quantify the edge particle source in deuterium plasmas. In the initial diagnostic commissioning, absolutely calibrated Ly-α brightness profiles were measured at the high field side (HFS) and low field side (LFS) in high confinement mode with forward and reversed toroidal magnetic field (Bt) direction. The deuterium n0profiles and ionization rate profiles are reconstructed from the inverted Ly-α emissivity profiles, in combination with the electron density (ne) and electron temperature (Te) profiles, solving the rate equation system for the deuterium atom occupation density. LLAMA measurements exhibit HFS-LFS asymmetries in pedestal particle source, which depend on the Btdirection highlighting the importance of scrape-off layer (SOL) drift direction and the necessity to consider the full poloidal particle source distribution in edge transport analyses.",

author = "{the DIII-D team} and Laggner, {F. M.} and Rosenthal, {A. M.} and A. Bortolon and Wilks, {T. M.} and Hughes, {J. W.} and F. Effenberg and Shafer, {M. W.} and T. Odstrcil",

note = "Publisher Copyright: {\textcopyright} 2021 47th EPS Conference on Plasma Physics, EPS 2021. All right reserved.; 47th EPS Conference on Plasma Physics, EPS 2021 ; Conference date: 21-06-2021 Through 25-06-2021",

year = "2021",

language = "English",

series = "47th EPS Conference on Plasma Physics, EPS 2021",

publisher = "European Physical Society (EPS)",

pages = "41--44",

booktitle = "47th EPS Conference on Plasma Physics, EPS 2021",

}

the DIII-D team 2021, Commissioning of the Ly-α pinhole camera diagnostic at DIII-D: Towards inboard and outboard neutral density measurements. in 47th EPS Conference on Plasma Physics, EPS 2021. 47th EPS Conference on Plasma Physics, EPS 2021, vol. 2021-June, European Physical Society (EPS), pp. 41-44, 47th EPS Conference on Plasma Physics, EPS 2021, Sitges, Spain, 06/21/21.

Commissioning of the Ly-α pinhole camera diagnostic at DIII-D: Towards inboard and outboard neutral density measurements. / the DIII-D team.
47th EPS Conference on Plasma Physics, EPS 2021. European Physical Society (EPS), 2021. p. 41-44 (47th EPS Conference on Plasma Physics, EPS 2021; Vol. 2021-June).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - the DIII-D team

AU - Laggner, F. M.

AU - Rosenthal, A. M.

AU - Bortolon, A.

AU - Wilks, T. M.

AU - Hughes, J. W.

AU - Effenberg, F.

AU - Shafer, M. W.

AU - Odstrcil, T.

PY - 2021

Y1 - 2021

N2 - The absolutely calibrated LLAMA diagnostic (LLAMA is the Lyman-Alpha Measurement Apparatus) has been recently installed on DIII-D [1, 2] to determine the neutral gas density (n0) profile and thereby, quantify the edge particle source in deuterium plasmas. In the initial diagnostic commissioning, absolutely calibrated Ly-α brightness profiles were measured at the high field side (HFS) and low field side (LFS) in high confinement mode with forward and reversed toroidal magnetic field (Bt) direction. The deuterium n0profiles and ionization rate profiles are reconstructed from the inverted Ly-α emissivity profiles, in combination with the electron density (ne) and electron temperature (Te) profiles, solving the rate equation system for the deuterium atom occupation density. LLAMA measurements exhibit HFS-LFS asymmetries in pedestal particle source, which depend on the Btdirection highlighting the importance of scrape-off layer (SOL) drift direction and the necessity to consider the full poloidal particle source distribution in edge transport analyses.

AB - The absolutely calibrated LLAMA diagnostic (LLAMA is the Lyman-Alpha Measurement Apparatus) has been recently installed on DIII-D [1, 2] to determine the neutral gas density (n0) profile and thereby, quantify the edge particle source in deuterium plasmas. In the initial diagnostic commissioning, absolutely calibrated Ly-α brightness profiles were measured at the high field side (HFS) and low field side (LFS) in high confinement mode with forward and reversed toroidal magnetic field (Bt) direction. The deuterium n0profiles and ionization rate profiles are reconstructed from the inverted Ly-α emissivity profiles, in combination with the electron density (ne) and electron temperature (Te) profiles, solving the rate equation system for the deuterium atom occupation density. LLAMA measurements exhibit HFS-LFS asymmetries in pedestal particle source, which depend on the Btdirection highlighting the importance of scrape-off layer (SOL) drift direction and the necessity to consider the full poloidal particle source distribution in edge transport analyses.

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M3 - Conference contribution

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BT - 47th EPS Conference on Plasma Physics, EPS 2021

PB - European Physical Society (EPS)

Y2 - 21 June 2021 through 25 June 2021

ER -

Commissioning of the Ly-α pinhole camera diagnostic at DIII-D: Towards inboard and outboard neutral density measurements

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