Studies of Be migration in the JET tokamak using AMS with 10Be marker

I. Bykov, H. Bergsåker, G. Possnert, Y. Zhou, K. Heinola, J. Pettersson, S. Conroy, J. Likonen, P. Petersson, A. Widdowson

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

The JET tokamak is operated with beryllium limiter tiles in the main chamber and tungsten coated carbon fiber composite tiles and solid W tiles in the divertor. One important issue is how wall materials are migrating during plasma operation. To study beryllium redistribution in the main chamber and in the divertor, a 10Be enriched limiter tile was installed prior to plasma operations in 2011-2012. Methods to take surface samples have been developed, an abrasive method for bulk Be tiles in the main chamber, which permits reuse of the tiles, and leaching with hot HCl to remove all Be deposited at W coated surfaces in the divertor. Quantitative analysis of the total amount of Be in cm2 sized samples was made with inductively coupled plasma atomic emission spectroscopy (ICP-AES). The 10Be/9Be ratio in the samples was measured with accelerator mass spectrometry (AMS). The experimental setup and methods are described in detail, including sample preparation, measures to eliminate contributions in AMS from the 10B isobar, possible activation due to plasma generated neutrons and effects of diffusive isotope mixing. For the first time marker concentrations are measured in the divertor deposits. They are in the range 0.4-1.2% of the source concentration, with moderate poloidal variation.

Original languageEnglish
Pages (from-to)370-375
Number of pages6
JournalNuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Volume371
DOIs
Publication statusPublished - 15 Mar 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

tiles
Tile
markers
Particle accelerators
Mass spectrometry
accelerators
mass spectroscopy
chambers
Beryllium
Limiters
beryllium
Plasmas
Atomic emission spectroscopy
reuse
isobars
fiber composites
abrasives
Inductively coupled plasma
leaching
carbon fibers

Keywords

  • Accelerator mass spectrometry (AMS)
  • Beryllium
  • ITER-like Wall
  • Materials migration
  • Nuclear fusion

Cite this

Bykov, I. ; Bergsåker, H. ; Possnert, G. ; Zhou, Y. ; Heinola, K. ; Pettersson, J. ; Conroy, S. ; Likonen, J. ; Petersson, P. ; Widdowson, A. / Studies of Be migration in the JET tokamak using AMS with 10Be marker. In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2016 ; Vol. 371. pp. 370-375.
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Studies of Be migration in the JET tokamak using AMS with 10Be marker. / Bykov, I.; Bergsåker, H.; Possnert, G.; Zhou, Y.; Heinola, K.; Pettersson, J.; Conroy, S.; Likonen, J.; Petersson, P.; Widdowson, A.

In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, Vol. 371, 15.03.2016, p. 370-375.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Bykov, I.

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AU - Heinola, K.

AU - Pettersson, J.

AU - Conroy, S.

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