Global distribution of tritium in JET with the ITER-like wall

Lee, S.E.; Hatano, Yuji; Tokitani, M.; Masuzaki, S.; Oya, Yasuhisa; Otsuka, Teppei; Ashikawa, N.; Torikai, Y.; Asakura, N.; Nakamura, Hirofumi; Isobe, K.; Kurotaki, H.; Hamaguchi, Dai; Hayashi, T.; Widdowson, A.; Jachmich, S.; Likonen, J.; Rubel, M.; Contributors, Jet

doi:10.1016/j.nme.2021.100930

Cited by 7 publications

(7 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, IWGL and DP specimens showed no T enrichment at the top region. As reported in previous papers [12,13], the T retention on PFSs of OPL specimens was higher by an order of magnitude than that on IWGL and DP specimens due to the retention mechanism for high energy (∼MeV) T ions by implantation. This is in contrast to the D retention reported where retention is dominated by co-deposition.…”

Section: Discussionsupporting

confidence: 75%

“…The values of T retention on all four castellation sides of each specimen were averaged and then compared for respective limiters and operation periods. This is shown in figure 10 which also contains data for PFSs presented in previous papers [12,13]. The T retention is higher after ILW1 than ILW3 in the castellation sides and comparable retention values are observed regardless of tile location after each campaign.…”

Section: Two-dimensional Tritium Distributionsupporting

confidence: 64%

“…Pajuste et al examined T retention in Be tile PFSs by the dissolution method [11]. The T retention reported was smaller by a factor of 2-10 depending on the specimen location than the values evaluated in our previous papers [12,13] and those given in figure 10. This difference can be ascribed, at least in part, to non-uniformity of T distributions in the tokamak and to differences in the measurement techniques.…”

Section: Two-dimensional Tritium Distributionmentioning

confidence: 67%

“…On the other hand, on the PFSs of Be limiters in the main chamber, there was no clear correlation between the deposition and T distributions. The T concentration was higher in the erosion-dominated areas than in the deposition zone on the outer poloidal limiter (OPL) [10][11][12][13] because deep implantation (micrometer range) of high-energy T was a dominant retention mechanism in PFSs of Be limiters [12]. As a consequence, the T retention in the erosion zone of those tiles was determined by the balance between the amount of T implanted at high energy and the amount removed by erosion and/or thermal desorption [12].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tritium distributions in castellated structures of Be limiter tiles from JET-ITER-like wall experiments

et al. 2023

Self Cite

View full text Add to dashboard Cite

Tritium (T) retention in the castellated structure of beryllium limiters used in JET with the ITER-like wall (ILW) during the first (ILW1), third (ILW3) and all three (ILW1-3) campaigns were examined and evaluated. Tritium was deposited on the surfaces inside the castellation grooves together with deuterium, beryllium, oxygen, carbon and small amounts of metallic impurities such as nickel, copper and tungsten. The T content after ILW1 was greater than after ILW3. This is attributed to the steadily decreasing amount of carbon impurities in JET from campaign to campaign. The majority of T was retained in shallow regions in the grooves, up to 2 mm from the entrance to the gap. It was comparable on all sides of the castellation, i.e. no difference has been detected between the toroidal and poloidal gaps. Secondly, the T retention in the gaps was similar on all specimens independently on their position in the tokamak while the retention on the plasma-facing surfaces was clearly depended on the tile position. The tritium deposition patterns in the castellation were also compared with the deuterium distribution determined in earlier studies.

show abstract

Section: Discussionsupporting

confidence: 75%

Section: Two-dimensional Tritium Distributionsupporting

confidence: 64%

Section: Two-dimensional Tritium Distributionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tritium distributions in castellated structures of Be limiter tiles from JET-ITER-like wall experiments

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The tiles selected for studies were sectioned (cut) to obtain samples which could be handled in respective analytical systems. Tritium analyses were performed by means of radiography using a tritium imaging plate technique (TIPT) [5,6], full combustion method (FCM) [7] and liquid scintillation counter (LSC). The identification of individual dust particles was done using scanning electron microscopy (SEM) and electron microprobe analyser [8].…”

Section: Methodsmentioning

confidence: 99%

Overview of tritium retention in divertor tiles and dust particles from the JET tokamak with the ITER-like wall

Torikai,

Kikuchi,

Owada

et al. 2023

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

Divertor tiles after JET-ILW campaigns and dust collected after JET-C and JET-ILW operation were examined by a set of complementary techniques (full combustion and radiography) to determine the total, specific and areal tritium activities, poloidal tritium distribution in the divertor and the presence of that isotope in individual dust particles. In the divertor tiles, the majority of tritium is detected in the surface region and, the areal activities in the ILW divertor are in the 0.5 – 12 kBq cm-2 range. The activity in the ILW dust is associated mainly with the presence of carbon particles being a legacy from the JET-C operation. The total tritium activities show significant differences between the JET operation with ILW and the earlier phase with the carbon wall (JET-C) indicating that tritium retention has been significantly decreased in the operation with ILW.

show abstract

Measurement of Hydrogen Permeation Fluxes Through Tungsten Deposition Layer Growing by Hydrogen Plasma Sputtering and Observation of Microstructure

Masuta,

Hara,

Oya

et al. 2024

Fusion Science and Technology

View full text Add to dashboard Cite

Global distribution of tritium in JET with the ITER-like wall

Cited by 7 publications

References 29 publications

Tritium distributions in castellated structures of Be limiter tiles from JET-ITER-like wall experiments

Tritium distributions in castellated structures of Be limiter tiles from JET-ITER-like wall experiments

Overview of tritium retention in divertor tiles and dust particles from the JET tokamak with the ITER-like wall

Measurement of Hydrogen Permeation Fluxes Through Tungsten Deposition Layer Growing by Hydrogen Plasma Sputtering and Observation of Microstructure

Contact Info

Product

Resources

About