QUESTにおける水素分子d 3Π準位回転温度を利用したタングステン表面温度計測Estimation of Tungsten Surface Temperature from d 3Π State Rotational Temperature of Hydrogen Molecules in QUEST
米田奈生A，四竈泰一A，F. ScottiB，花田和明C，井口拓己A，出射浩C，恩地拓己C，江尻晶D，井戸毅C，河野香C，彭翊D，大澤佑規D，弥富豪D，木谷彰宏E，工藤倫大E，平賀涼輔E，武田康佑E，R. E. BellF，A. MaanF，R. MajeskiF，小野雅之F，蓮尾昌裕A，中村一男C，永島芳彦C，池添竜也C，長谷川真C，黒田賢剛C，東島亜紀C，永田貴大C，島袋瞬C，新谷一朗C，関谷泉C
Purpose: Development of thermometry less affected by the changes in surface using d 3Π state rotational temperature of H2 (𝑇𝑇rot𝑑𝑑 )
Previous Researches•For graphite wall (TEXTOR) [1]
𝑑𝑑 → 𝑇𝑇wall as 𝑛𝑛e → 0
•For lithium wall (LTX-β)
𝑑𝑑 → 𝑇𝑇wall as 𝑛𝑛e → 0(on the assumption of linear increase in 𝑇𝑇rot
𝑑𝑑 with 𝑛𝑛e)
Questions
•𝑇𝑇rot
𝑑𝑑 → 𝑇𝑇wall as 𝑛𝑛e → 0?
•Is the relation independent from wall materials?
𝑑𝑑 approaches 𝑇𝑇wall as 𝑛𝑛e → 0Result in LTX-β (lithium wall)
Result in QUEST (tungsten wall)
Independent from wall materials
Method
Measured H
emission spectra for tungsten wall of QUEST
Derived radial distribution of 
emissivity
assuming toroidal symmetry
Estimated 
assuming 
a Boltzmann distribution.
Evaluated the increase by electron
collision excitation
For Δ𝑙𝑙 ≪ 1 (for LTX-β)
𝑇𝑇rot𝑑𝑑Δ𝑙𝑙 = 𝑇𝑇wall + 𝐶𝐶e′ � 𝑛𝑛e Δ𝑙𝑙 � Δ𝑙𝑙
𝑇𝑇rot𝑑𝑑𝑙𝑙wall
= 𝑇𝑇wall + �0
𝑙𝑙wall𝐶𝐶e′ � 𝑛𝑛e 𝑙𝑙 𝑑𝑑𝑙𝑙
Increase by electron-collision excitation
Approximation of 𝑇𝑇rot𝑑𝑑
Trotd [K]
1.00.80.60.40.20.0
lwall [m]
Twall = 468 KTwall = 370 K ﬁtted
ﬁtting range
𝑇𝑇rot𝑑𝑑 as a function of 𝑙𝑙wall
京大院工A，LLNLB，九大応力研C，東大新領域D，九大総理工E，PPPLF
𝑇𝑇wall: wall temperature 𝑛𝑛e: electron density
Supported by Mori Manufacturing Research and Technology Foundation (森記念製造技術研究財団), Japan / U. S. Cooperation in Fusion Research and Development (日米科学技術協力事業（核融合分野）), and USDoE contracts DE-AC52-07NA27344 (LLNL) and DE-AC02-09CH11466 (Princeton University).
Agreement of resultswith the model
Results
Poloidal cross section of QUEST
1.51.00.50.0R [m]
 thermocouples
hot walls
(tungsten)
measurement positions of 𝑇𝑇r𝑑𝑑ot
𝑙𝑙wall: distance from the hot wall
[1] E.M. Hollmann, et al., PPCF, 48, 1165 (2006)