DOUBLE code simulations of emissivities of fast neutrals for different plasma observation view-lines of neutral particle analyzers on the COMPASS tokamak

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10389461" target="_blank" >RIV/00216208:11320/18:10389461 - isvavai.cz</a>

Alternative codes found

RIV/61389021:_____/18:00508697

Result on the web

<a href="https://doi.org/10.1088/1742-6596/992/1/012009" target="_blank" >https://doi.org/10.1088/1742-6596/992/1/012009</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/992/1/012009" target="_blank" >10.1088/1742-6596/992/1/012009</a>

Result language

angličtina

Original language name

DOUBLE code simulations of emissivities of fast neutrals for different plasma observation view-lines of neutral particle analyzers on the COMPASS tokamak

Original language description

Neutral particle analyzers (NPA) measure line-integrated energy spectra of fast neutral atoms escaping the tokamak plasma, which are a product of charge-exchange (CX) collisions of plasma ions with background neutrals. They can observe variations in the ion temperature T-i of non-thermal fast ions created by additional plasma heating. However, the plasma column which a fast atom has to pass through must be sufficiently short in comparison with the fast atom&apos;s mean-free-path. Tokamak COMPASS is currently equipped with one NPA installed at a tangential mid-plane port. This orientation is optimCal for observing non-thermal fast ions. However, in this configuration the signal at energies useful for T-i derivation is lost in noise due to the too long fast atoms&apos; trajectories. Thus, a second NPA is planned to be connected for the purpose of measuring T-i. We analyzed different possible view-lines (perpendicular mid-plane, tangential mid-plane, and top view) for the second NPA using the DOUBLE Monte-Carlo code and compared the results with the performance of the present NPA with tangential orientation. The DOUBLE code provides fast-atoms&apos; emissivity functions along the NPA view-line. The position of the median of these emissivity functions is related to the location from where the measured signal originates. Further, we compared the difference between the real central T-i used as a DOUBLE code input and the T-iCX derived from the exponential decay of simulated energy spectra. The advantages and disadvantages of each NPA location are discussed.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Journal of Physics: Conference Series

ISBN

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ISSN

1742-6588

e-ISSN

1742-6596

Number of pages

6

Pages from-to

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Publisher name

IOP PUBLISHING LTD

Place of publication

BRISTOL

Event location

Sozopol

Event date

Sep 25, 2017

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

000445817300009