Validating fast-ion wall-load IR analysis-methods against W7-X NBI empty-torus experiment

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Validating fast-ion wall-load IR analysis-methods against W7-X NBI empty-torus experiment. / W7-X Team ; Asunta, O.

In: Journal of Instrumentation, Vol. 14, 07018, 07.2019, p. 1-12.

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@article{b91a75ea12e740a1962ec54235be403e,
title = "Validating fast-ion wall-load IR analysis-methods against W7-X NBI empty-torus experiment",
abstract = "The first neutral beam injection (NBI) experiments in Wendelstein 7-X (W7-X) stellarator were conducted in the summer of 2018. The NBI system is used to heat the magnetically confined plasma by neutralising an accelerated hydrogen ion beam and directing it into the plasma, where the resulting energetic ions release their energy to heat the plasma. The modelling of the NBI fast ion experiments has commenced, including estimation of the shine-through and the orbit-losses. The stellarator has a wide-angle infra red (IR) imaging system to monitor the machine plasma facing component surface temperatures. This work validates the NBI model {"}Beamlet Based NBI (BBNBI){"} and the newly written synthetic IR camera model. The validation is accomplished by comparing the measured and the synthetic IR camera measurements of an experiment where the NBI was injected into the vacuum vessel without a plasma. A good qualitative and quantitative match was found. This agreement is further supported by spectroscopic and calibration measurements of the NBI and and IR camera systems.",
keywords = "Simulation methods and programs, Plasma diagnostics - interferometry, spectroscopy and imaging, Plasma diagnostics - charged-particle spectroscopy, BALMER ALPHA-EMISSION, SYSTEM, BEAMS",
author = "{W7-X Team} and S. Akaslompolo and P. Drewelow and Y. Gao and A. Ali and O. Asunta and S. Bozhenkov and J. Fellinger and Ford, {O. P.} and {den Harder}, N. and D. Hartmann and M. Jakubowski and P. McNeely and H. Niemann and F. Pisano and N. Rust and Sitjes, {A. Puig} and M. Sleczka and A. Spanier and Wolf, {R. C.}",
note = "| openaire: EC/H2020/633053/EU//EUROfusion",
year = "2019",
month = "7",
doi = "10.1088/1748-0221/14/07/P07018",
language = "English",
volume = "14",
pages = "1--12",
journal = "Journal of Instrumentation",
issn = "1748-0221",

}

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TY - JOUR

T1 - Validating fast-ion wall-load IR analysis-methods against W7-X NBI empty-torus experiment

AU - W7-X Team

AU - Akaslompolo, S.

AU - Drewelow, P.

AU - Gao, Y.

AU - Ali, A.

AU - Asunta, O.

AU - Bozhenkov, S.

AU - Fellinger, J.

AU - Ford, O. P.

AU - den Harder, N.

AU - Hartmann, D.

AU - Jakubowski, M.

AU - McNeely, P.

AU - Niemann, H.

AU - Pisano, F.

AU - Rust, N.

AU - Sitjes, A. Puig

AU - Sleczka, M.

AU - Spanier, A.

AU - Wolf, R. C.

N1 - | openaire: EC/H2020/633053/EU//EUROfusion

PY - 2019/7

Y1 - 2019/7

N2 - The first neutral beam injection (NBI) experiments in Wendelstein 7-X (W7-X) stellarator were conducted in the summer of 2018. The NBI system is used to heat the magnetically confined plasma by neutralising an accelerated hydrogen ion beam and directing it into the plasma, where the resulting energetic ions release their energy to heat the plasma. The modelling of the NBI fast ion experiments has commenced, including estimation of the shine-through and the orbit-losses. The stellarator has a wide-angle infra red (IR) imaging system to monitor the machine plasma facing component surface temperatures. This work validates the NBI model "Beamlet Based NBI (BBNBI)" and the newly written synthetic IR camera model. The validation is accomplished by comparing the measured and the synthetic IR camera measurements of an experiment where the NBI was injected into the vacuum vessel without a plasma. A good qualitative and quantitative match was found. This agreement is further supported by spectroscopic and calibration measurements of the NBI and and IR camera systems.

AB - The first neutral beam injection (NBI) experiments in Wendelstein 7-X (W7-X) stellarator were conducted in the summer of 2018. The NBI system is used to heat the magnetically confined plasma by neutralising an accelerated hydrogen ion beam and directing it into the plasma, where the resulting energetic ions release their energy to heat the plasma. The modelling of the NBI fast ion experiments has commenced, including estimation of the shine-through and the orbit-losses. The stellarator has a wide-angle infra red (IR) imaging system to monitor the machine plasma facing component surface temperatures. This work validates the NBI model "Beamlet Based NBI (BBNBI)" and the newly written synthetic IR camera model. The validation is accomplished by comparing the measured and the synthetic IR camera measurements of an experiment where the NBI was injected into the vacuum vessel without a plasma. A good qualitative and quantitative match was found. This agreement is further supported by spectroscopic and calibration measurements of the NBI and and IR camera systems.

KW - Simulation methods and programs

KW - Plasma diagnostics - interferometry, spectroscopy and imaging

KW - Plasma diagnostics - charged-particle spectroscopy

KW - BALMER ALPHA-EMISSION

KW - SYSTEM

KW - BEAMS

U2 - 10.1088/1748-0221/14/07/P07018

DO - 10.1088/1748-0221/14/07/P07018

M3 - Article

VL - 14

SP - 1

EP - 12

JO - Journal of Instrumentation

JF - Journal of Instrumentation

SN - 1748-0221

M1 - 07018

ER -

ID: 36101743