B2.5-Eunomia simulations of Pilot-PSI

Wieggers, R. C.

doi:10.6100/ir741230

Cited by 1 publication

(3 citation statements)

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“…The mechanism driving the increase of radiation during H exposure in presence of N 2 was elucidated by using Eunomia [32], a spatially-resolved 2D Monte-Carlo code developed to simulate the behaviour of neutral particles in the linear plasma devices Pilot-PSI and Magnum-PSI. The code provides the radial atomic H density as a representation of the recombination yield while accounting for a large number of reaction pathways involving H 2 and N 2 species [33].…”

Section: Time-evolution Of Plasma Emissionmentioning

confidence: 99%

“…This position fully blocks the bolometer detector from receiving radiation while neutrals can still diffuse towards the sensors (figure 2). A zero procedure which equilibrates the Wheatstone bridge resulting in ∆U b = 0 is Radial distribution of atomic H in typical Magnum-PSI plasma conditions at a background pressure of 0.3, 0.5 and 1 Pa simulated using Eunomia [32]. The addition of N 2 clearly leads to an increased level of the atomic H fraction in the plasma.…”

Section: Detachment Studiesmentioning

confidence: 99%

“…Figure 5.Radial distribution of atomic H in typical Magnum-PSI plasma conditions at a background pressure of 0.3, 0.5 and 1 Pa simulated using Eunomia[32]. The addition of N 2 clearly leads to an increased level of the atomic H fraction in the plasma.…”

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confidence: 99%

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Plasma radiation studies in Magnum-PSI using resistive bolometry

et al. 2018

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Both the physics of divertor detachment and vapour shielding are characterized by a relatively large amount of radiation produced in the divertor. The linear plasma generator Magnum-PSI is well-suited to study such processes due to its ITER-divertor relevant plasma conditions, simplified geometry and diagnostic accessibility. The need the quantify the plasma radiated power close to the target surface motivated the development of a 4-channel resistive bolometer for Magnum-PSI, and marks the first deployment of such a diagnostic on a linear device. An axially resolved measurement of plasma emission at arbitrary distances from the target surface is now possible. The radial position of the detector can be varied, hereby viewing the full diameter of the plasma column or down to a central region. The overall system design is discussed alongside a comparison of the spectral absorbance of carbon-coated versus non-coated Au/Al bolometer sensors. Despite low electron temperatures of the plasma (1-5 eV), the observed power densities were found to be 10-37 times the sensor noise floor of ∼0.1 W m −2. A synthetic diagnostic based on collisional radiative model calculations from ADAS could well match observed values from H and Ne plasmas while the measured values for Ar and He were more difficult to reproduce. The obtained findings allow for approximate power balance calculations in Magnum-PSI indicating that maximally ∼47 % and ∼14 % of the total power is lost by radiation in the cases of Ar and Ne/He respectively. The results demonstrate the feasibility of resistive bolometry in low temperature high density plasma regions and on long timescales (>450 s) which is of relevance to ITER. Due to long-term temperature drifts which were observed, a planned upgrade involves the installation of a shutter and FPGAbased electronics for increased accuracy.

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Section: Time-evolution Of Plasma Emissionmentioning

confidence: 99%

Section: Detachment Studiesmentioning

confidence: 99%