Mass spectrometry analysis of the impurity content in N2 seeded discharges in JET-ILW

被引：13

作者：

Drenik, A. ^{[2
]}

Oberkofler, M. ^{[3
]}

Alegre, D. ^{[4
]}

Kruezi, U. ^{[5
]}

Brezinsek, S. ^{[6
]}

Mozetic, M. ^{[2
]}

Nunes, I. ^{[7
]}

Wischmeier, M. ^{[3
]}

Giroud, C. ^{[5
]}

Maddison, G. ^{[5
]}

Reux, C. ^{[8
]}

机构：

[1] JET EFDA, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] EURATOM, Jozef Stefan Inst, Ljubljana 1000, Slovenia

[3] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[4] As EURATOM CIEMAT, Madrid 28040, Spain

[5] Culham Ctr Fus Energy, Abingdon OX14 3DB, Oxon, England

[6] Forschungszentrum Julich, IEF Plasmaphys, EURATOM Assoc, D-52425 Julich, Germany

[7] Assoc EURATOM IST, Inst Plasmas & Fusao Nucl, P-1049001 Lisbon, Portugal

[8] EURATOM, CEA, IRFM, F-13108 St Paul Les Durance, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 463卷

关键词：

Data acquisition - Mass spectrometry - Nitrogen plasma - Methane - Nitrogen - Ammonia;

D O I：

10.1016/j.jnucmat.2014.12.084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Presented are the results of the first mass spectrometry study of impurities at JET with the ILW. Measurements are performed with the newly-installed RGA system that allows for data acquisition in all stages of machine operation. Impurities are predominantly found in the 16-20 AMU range, populated by water, methane and ammonia, and at 28 AMU (CO and N-2). The main contaminants in non-seeded discharges are deuterated methane and water, and nitrogen, which are present only in low amounts, and are likely produced by plasma-surface interaction. During N-2 seeded discharges, signals increase significantly at 28 AMU, but also in the 16-20 AMU range, indicating conversion of nitrogen to ammonia. In subsequent non-seeded discharges, impurity content is reduced by an order of magnitude, however it exhibits a 5-7 discharge-long legacy. (C) 2015 EURATOM. Published by Elsevier B.V. All rights reserved.

引用

页码：684 / 687

页数：4

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