First partial pressure measurements using Optical Penning Gauge at the COMPASS tokamak

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00644661" target="_blank" >RIV/61389021:_____/25:00644661 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0920379625002339?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0920379625002339?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.fusengdes.2025.115033" target="_blank" >10.1016/j.fusengdes.2025.115033</a>

Result language
angličtina
Original language name
First partial pressure measurements using Optical Penning Gauge at the COMPASS tokamak
Original language description
The Optical Penning Gauge for partial pressure measurements has been successfully implemented in the lower high-field side diagnostic port of the COMPASS tokamak, demonstrating a cost-effective way for resolving deuterium and helium and enabling measurements on timescales of about ten milliseconds. The procedure of its implementation is described in detail. Calibration data for deuterium and helium are discussed, including the effect of deuterium pressure on the helium channel. Time-resolved measurements of the working gas (deuterium) and the main gaseous impurity (helium) show, how helium, used for glow discharge conditioning and typically amounting to 5 10 % in the shots, is released from the surface of the tokamak vacuum vessel and the plasma-facing components during the subsequent shot. Behavior of both gases in L-mode, ELM-free and ELMy H-mode regimes and even just after the main (high-current high-temperature) discharge is exemplified. Surprisingly long low-current after-discharges (2 3 kA, about 100 ms), predominantly in helium, were observed with the Optical Penning Gauge and confirmed with other diagnostics. Simulations of the breakdown and burn-through phase for COMPASS using the DYON code are introduced, showing reasonable agreement with the measured data.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics

Project
<a href="/en/project/GA19-15229S" target="_blank" >GA19-15229S: The impact of error fields on enhanced confinement regimes in tokamaks</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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