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Reversed-direction 2-point modelling applied to divertor conditions in DIII-D

J H Nichols, P C Stangeby, A G McLean, J M Canik, A L Moser, M W Shafer, H Q Wang2024年Plasma Physics and Controlled FusionIF 2.2出版社

A predictive form of the extended 2-point model known as the 'reverse 2-point model', Rev2PM, is applied to a range of detachment levels in the open lower divertor of DIII-D, showing that the experimentally measured electron temperature (Te) and pressure (pe) at the divertor entrance can be calculated within 50% from target measurements, if and only if a posteriori corrections for convective heat flux are included in the model. Unlike the standard 2-point model, the Rev2PM calculates upstream scrape-off layer (SOL) quantities (such as separatrix Te and pe) from target conditions (such as Te and parallel heat flux), with volumetric power and momentum losses depending solely on target Te. The Rev2PM is tested against a database of DIII-D inter-ELM divertor Thomson scattering measurements, built from a series of 6 MW, 1.3 MA, LSN H-mode discharges with varied main ion density, drift direction, and nitrogen puffing rate. Measured target Te ranged from 0.4–25 eV over this database, and upstream Te ranged from 5–60 eV. Poor agreement is found between upstream measurements and Rev2PM calculations that assume purely conductive parallel heat transport. However, introducing a posteriori corrections to account for convective heat transport brings the Rev2PM calculations within 50% of the measured upstream values across the dataset. These corrections imply that up to 99% of the parallel heat flux is carried by convection in detached conditions in the DIII-D open lower divertor, though further work is required to assess any potential dependencies on device size or divertor closure.

日本語訳

「リバース2点モデル」(Rev2PM)として知られる拡張2点モデルの予測形式を、DIII-Dのオープン下部ダイバータにおける様々なデタッチメントレベルに適用し、対流熱流束に対する事後補正がモデルに含まれる場合に限り、ダイバータ入口で実験的に測定された電子温度(Te)および圧力(pe)が、ターゲット測定値から50%以内で計算できることを示す。標準の2点モデルとは異なり、Rev2PMは、上流スクレイプオフ層(SOL)の量(例えばセパラトリックスのTeとpe)を、ターゲット条件(例えばTeと平行熱流束)から計算し、体積的パワー損失と運動量損失はターゲットTeのみに依存する。Rev2PMは、主イオン密度、ドリフト方向、および窒素パフ率を変化させた一連の6 MW, 1.3 MA, LSN Hモード放電から構築された、DIII-Dのinter-ELMダイバータThomson散乱測定のデータベースに対して検証される。このデータベース全体で、測定されたターゲットTeは0.4–25 eVの範囲であり、上流Teは5–60 eVの範囲であっだ。純粋に伝導的な平行熱輸送を仮定するRev2PM計算と上流測定値との間には、一致が悪い。しかしながら、対流熱輸送を考慮するための事後補正を導入すると、データセット全体にわたって、Rev2PM計算は測定された上流値の50%以内に収まる。これらの補正は、DIII-Dのオープン下部ダイバータにおけるデタッチメント条件下では、平行熱流束の最大99%が対流によって運ばれることを示唆する。ただし、装置サイズまたはダイバータの閉鎖度に対する潜在的な依存性を評価するには、さらなる研究が必要である。

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diii-d高精度(タイトル一致)

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DivertorDIII-D
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